Difference between revisions of "F15: Fury"

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=== Software Design ===
 
=== Software Design ===

Revision as of 19:35, 17 December 2015

Project Title

Fury a self driving RC car

Abstract

This section should be a couple lines to describe what your project does.

Schedule

Sl. No Start Date End Date Task Actual End date
1 09/20/2015 09/27/2015 Buy RC Car 09/26/2015
2 09/27/2015 10/3/2015 Divide the modules among team members 10/2/2015
3 10/3/2015 10/10/2015 Decide the pins used by each module 10/15/2015
4 10/10/2015 10/25/2015 Get the main board ready which connects all SJOne boards 10/20/2015
5 10/3/2015 10/30/2015 Work on individual modules 11/15/2015
6 10/31/2015 11/13/2015 Sensors, motors and master controller are integrated and tested.

GPS, android and master are integrated and tested

12/05/2015
7 11/14/2015 12/10/2015 Integration, testing and tweaking 12/16/2015
8 12/16/2015 12/16/2015 Final testing 12/16/2015

Parts List & Cost

Sl. No Module Name Cost Link
1 SJOne board $80 X 5 http://www.socialledge.com/sjsu/index.php?title=Main_Page
2 Compass (CMPS11) $45.95 https://acroname.com/products/r375-cmps11?sku=R375-CMPS11
3 SparkFun Venus GPS with SMA Connector $57.49 https://www.sparkfun.com/products/11058
4 Antenna GPS Embedded SMA $12.99 https://www.sparkfun.com/products/177
5 RN42-XV Bluetooth Module - PCB Antenna $26.93 https://www.sparkfun.com/products/11601
6 RF antenna $3 X 2 http://www.socialledge.com/sjsu/index.php?title=Main_Page
7 RC Car $163.11 -
8 Batteries $86.38 -
9 Traxxas 6520 RPM Sensor $7.77 http://www.amazon.com/Traxxas-6520-XO-1-Long-Sensor/dp/B006IRXEZM
10 MB1200XL-MaxSonar-EZ0or $44.95 X 3 http://www.maxbotix.com/Ultrasonic_Sensors/MB1200.htm
11 Lidar Lite Sensor (SEN-13167) $89.95 File:F15 243 Fury Lidar spec.pdf
12 CAN Transceiver (MPC2562-E/P) $1.02 X 5 http://www.mouser.com/ds/2/268/25167B-245700.pdf
13 Female Header 2x17 (929975-01-17-RK) $2.79 X 5 http://multimedia.3m.com/mws/media/22500O/3mtm-boardmount-skt-100-100x-100strt-sldr-tails-ts0815.pdf
14 Prototype Board (Twin Industries 800-45) $12.99

Introduction

The Controllers

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

CAN 11-bit ID Format

DST SRC MSG
3 bits (11-9) 3 bits (8-6) 5 bits (5-0)

Controller ID Table

Controller ID Controller Type
000 Motor and LCD Controller
001 Master Controller
010 Sensor Controller
011 GPS and compass Controller
100 Communication Bridge + Android Controller

Master Controller

Group Members

  • Bhargava Sreekantappa Gayathri
  • Thiruparan Balachandran

Schedule

Sl.No Start Date End Date Task Status Actual Completion date Problems Encountered
1 9/27/2015 10/4/2015 Decide on Node address and message ID's for CAN controller. Completed 10/1/2015
2 10/4/2015 10/11/2015 Research and decide on the tasks, priorities and scheduling. Completed 10/12/2015
3 10/11/2015 10/18/2015 Come up with a kill switch mechanism with the existing remote control and complete building the car. In Progress
6 10/18/2015 10/30/2015 Set up inter board communication with CAN and test specific messages sent to a module and broadcast messages.
5 10/25/2015 10/30/2015 Get the car running by integrating with the motor controller and Implement logging.
6 10/31/2015 11/13/2015 Integrate GPS module and implement the algorithm for the car to travel to the destination with a hard coded Destination co-ordinates.
7 11/13/2015 11/21/2015 Integrate sensor module and implement obstruction avoidance mechanism.
8 11/21/2015 11/25/2015 Integrate the Bluetooth bridge and get co ordinates from hone as well as send vehicle parameters to the phone for displaying in the app.
9 11/26/2015 12/15/2015 Testing and fine tuning as required.

Hardware Design

kill-switch

To stop the car during an emergency we need a wireless kill switch which would kill the power to the motors. For the kill switch we will be using a 4 channel remote control from gearbest.com. The module has the following properties:

  • Working voltage: DC 12V, relay excitation voltage of 5V
  • Static current: Less than 7mA
  • Relay output: Controllable AC / DC select-able
  • Working frequency: 315MHz, 433.92MHz, can customize special frequency
  • Control modes: Latch (L4), Unlatch (M4), Self-latching (T4)
  • Channel: 4 channels
  • Working range: 200 meters
  • High-security, stable performance, low power consumption, and easy to use

The main battery which will power the motors will be having the kill switch in its path, when ever the kill switch is armed main battery will not be fed to the motors.

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

Software Design

Controller Communication Table

Master Control Module
S.R. Message Number Destination Message Name (MSG_FUNCTION) Data Layout of Data Sent over CAN (byte[0] = total number of data bytes)
1 0x020 Motor Controller RESET
-
2 0x220 Sensor Controller RESET
-
3 0x221 Sensor Controller HEART BEAT
-
4 0x320 Geo-controller RESET
-
5 0x420 Communication Bridge RESET
-
6 0x021 Motor Controller STEERING
8 bytes steering data
7 0x321 Geo controller DESTINATION
8 bytes destination latitude and longitude data
8 0x421 Communication Bridge DISPLAY DATA
8 bytes data to be displayed on the LCD

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Motor and I/O controller

Group Members

  • Sin Yu Ho
  • Nimmi Bhatt

Schedule

Sl.No Start Date End Date Task Status Actual Completion date Problems Encountered
1 9/27/2015 10/3/2015 Decide and purchase rpm sensor and LCD screen module Completed 10/1/2015
2 10/4/2015 10/11/2015 Research and understand servo/throttle motor and issue command from terminal to control it. Complete 10/25/2015 Programming throttle motor backward rotation
3 10/11/2015 10/18/2015 Understand LCD module programming and RPM sensor, and create a speed monitoring Complete 10/18/2015
4 10/18/2015 10/25/2015 Design CAN message and implement CAN infrastructure. Complete 10/30/2015 Delay due to full can implementation
5 10/25/2015 10/30/2015 Design and create display for monitoring sensor, gps, connection bridge, and master on LCD module Complete 11/2/2015
6 10/31/2015 11/13/2015 Integrate with master, testing and debug Complete 11/20/2015
7 11/14/2015 12/10/2015 Integrate with the whole system, testing and debug In progress

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.


Schematic for Motor and IO block
  • LCD: : 4D Systems- uLCD-35DT-AR

The car comes with a servo motor(Arrma ADS-5 Steering Servo motor), a battery (Arrma 6 cell 2000mAh 7.2 volt NiMh battery pack), ESC (Arrma mega waterproof 35A ESC), and a DC motor(15T mega brushed motor).

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

CAN - Master controller makes decision for motors’ behavior. The decision is sent to motor controller through CAN bus with options that provided by each module. Full can is enabled in motor/IO controller board, which means when the module receives CAN messages, messages are put into ram memory by hardware. Since LCD provides information display screen for each controller on this car, many CAN messages are received. Using normal CAN in this case accumulates the queue in CAN easily and messages with the same message id most likely occurs more than once but only the last one matters. Therefore, full can is a better option since the software can read from the ram for the most recent messages. For motor controller, software reads and analyzes motor messages (message ID 0x20, 0x21 and 0x22) every 0.01s, and send 2 messages to CAN bus every 1s. Following is the DBC file for CAN.

           BO_ 20 RESET_MOTOR: 1 DRIVER
            SG_ RESET_MOTOR_cmd : 0|1@1+ (1,0) [0|0] "" MOTOR
           BO_ 21 STEER: 1 DRIVER
            SG_ DRIVER_STEER_dir : 0|4@1+ (1,0) [0|4] "" MOTOR
           BO_ 22 THROTTLE: 1 DRIVER
            SG_ DRIVER_THROTTLE_stop : 0|1@1+ (1,0) [0|1] "" MOTOR
            SG_ DRIVER_THROTTLE_forward : 1|1@1+ (1,0) [0|1] "" MOTOR
            SG_ DRIVER_THROTTLE_usecustom : 2|1@1+ (1,0) [0|1] "" MOTOR
            SG_ DRIVER_THROTTLE_custom : 3|2@1+ (1,0) [0|3] "" MOTOR
            SG_ DRIVER_THROTTLE_incr : 5|1@1+ (1,0) [0|1] "" MOTOR
           BO_ 100 MOTOR_HEARTBEAT: 8 MOTOR
            SG_ MOTOR_HEARTBEAT_cmd : 0|64@1+ (1,0) [0|0] "" DRIVER
           BO_ 102 SPEED: 1 MOTOR
            SG_ MOTOR_SPEED_speed : 0|8@1+ (1,0) [0|0] "" DRIVER
            SG_ MOTOR_SPEED_rpm : 8|8@1+ (1,0) [0|0] "" DRIVER

PWM (Pulse Width Modulation)- This is an analog signal that micro-controller sends to different module to control the motor speed or a motor rotation. Since we would like to build a self-driving car with a similar performance as its original performance, we used an oscilloscope to measure the base frequency from the wireless receiver, which comes with the car to control the motors. 54.24Hz is measured, and we round it up to 55Hz in the software. Therefore, all the calculation is based on 55Hz in this project.

Maximum Duty Cycle for turning right/going forward
Minimum Duty Cycle for turning left/going backward
Duty Cycle for going straight/stop


Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Displaying on LCD

In 1Hz task, LCD will update the display as following.

LCD input Flow Chart


Speed Sensor

When hall sensor detects a magnetic field difference, an interrupt is generated. This interrupt will increment a counter. In every 0.5s, RPM will be calculated with the counter, and the counter will be cleared.

       void speed_pulse_start(void)
       {
           SpeedMonitor::getInstance()->addRpmCounter();
       }
       SpeedMonitor::SpeedMonitor()
       {
           int port2_5 = 5;
           eint3_enable_port2(port2_5, eint_rising_edge, speed_pulse_start);
           m_rpmCounter = 0;
       }

Setting Steering Direction/ Speed

In 100Hz task, RAM will be checked if steer/throttle CAN message is updated. When a message is received, the PWM to control motor will be updated.

Steering Motor Flow Chart
Throttle Motor Flow Chart


Self Tuning

Based on CAN message from master, custom speed is set. This feature is to make sure the car is running under the custom speed all the time.

Self tuning Flow Chart

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Speed Sensor - This sensor detects magnetic field and outputs a pulse to the microcontroller. In this project, a magnet sticks to the wheel. When the wheel rotates, the magnet gets closer to the sensor and the sensor would generate a pulse. With this pulse, software in the microcontroller can calculate time difference between one pulse and another to get the RPM(rotation per minute). The car should maintain in a certain speed selected by the master, and RPM implies the speed. When run speed is lower than selected speed, the PWM is increased gradually in order to run with the rpm that master selected.

Servo Motor - For this motor, 10% of duty cycle provides the furthest left rotation, 20% duty cycle provides the furthest right and 15% put the wheel to go straight. Five options are provided according to this data for master controller:

Servo Motor Options
Options PWM
Far Left 5.5
Far Left 6.875
Center 8.25
Right 9.625
Far Right 11

ESC (Electronic Speed Controller) - This module receives PWM from microcontroller and outputs a DC signal to DC motor to control speed and rotation direction. To reduce the complexity of the speed control for the master controller, 7 options are provided. 3 levels for moving forward and for moving backward respectively and a stop option. Each level is defined by rpm of a wheel.

Speed Options
Options Target Rpm
Stop 0
Forward/Backward Custom 1 120
Forward/Backward Custom 2 160
Forward/Backward Custom 3 200

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Backward - We did not know how to control the car goes backward. After quite a bit of research and experiment with the car, we found out that the ESC requires two clicks from the remote to change direction. As a result, we simulates it by sending 2 different close-to-base PWM values.

Brake - Our car does not have a brake. When the base PWM is sent to the ESC. The car will still move forward due to momentum. Master controller may need to take this into calculation. We will suggest to pick a car with a brake option.

Speed sensor - At first, we stick 1 magnetic on the right back wheel and target rpm is 120. This also means about 2 pulses per second is received. Since number of data is too little for each second, the analysis/tuning of speed only can happen every 1 second. To increase the number of data, we stick 5 magnetic in total on the wheel, which means about 10 pulse per second. Now, the analysis/tuning of speed will happen every 0.5 second.

Computer program - One of our teammates' computer, was used to program the flash all the time, all of a sudden, causes the board rebooting after loading the program. We tried to load the exact same hex with another computer to the same board, and the board works fine.

Sensor Controller

Group Members

  • Christopher Laurence
  • Julio Fuentes

Schedule

Sl.No Start Date End Date Task Status Actual Completion date Problems Encountered
1 9/27/2015 10/3/2015 Order ultra sonic sensors and read data sheets Completed 10/2/2015 N/A
2 10/4/2015 10/10/2015 Connect ultra sonic sensor to LPC board & see if LDAR is an option Completed 10/10/2015 N/A
3 10/11/2015 10/17/2015 Read data value from sensor and send in CAN bus Completed 10/17/2015 N/A
4 10/18/2015 10/24/2015 Integrate and test proximity sensors Completed 10/30/2015 N/A
5 10/25/2015 10/31/2015 Develop battery sensor code Completed 10/31/2015 N/A
6 11/01/2015 11/07/2015 Integrate and test battery sensor Completed 11/07/2015 N/A
7 11/08/2015 11/21/2015 Complete hardware testing Completed 12/12/2015 N/A

Hardware Design

For the Sensor team, we decided to use three ultrasonic sensor and a LIDAR sensor for the front. We also use a voltage dividing circuit to bring down the voltage of the batteries, so we can monitor the voltage using two ADC pins. Lastly, our voltage regulator comes with a flag bit that indicates that the voltage has dropped below 5% of 5 volts. Below are the schematics and pin layout for our design.

Battery Sensor Schematic
Sonic & LIDAR Sensor Schematic



Hardware Interface

Ultrasonic Sensor

The ultrasonic sensor that we used for this project came with three interface methods. The XL-MaxSonar EZ are a highly senstive sensor that is capable of detecting object up to 725 cm away. However, this ultrasonic sensor will not be able to give you the actual distance of an object less than 20 cm away but it will detect it. The sensors allowed reading from ADC, UART, and PWM. The sensor group decided to use PWM because there would not be enough ADC available to do the battery sensor. The UART interface would take approximately 100 ms per a reading but the PWM could read a value between 18ms and 52 ms. Another reason we used PWM was because there are several pins that support PWM available on the SJSU board.The method to use the PWM is to trigger a 20 us high signal to the RX pin and read the value back from the PWM. The PWM will have an rising edge and falling edge and the time held high indicate the distance to the object.


XL-MaxSonar EZ
UltraSonic Waveform

Lidar Lite Laser Distance Sensor

The Lidar laser distance sensor requires 5V and I2C interface operating at a maximum rate of 100Kbps for communication. The Lidar Lite has a maximum acquisition time of 20ms. For reliability, the sampling interval was set to 40ms. The maximum distance measuring capability of the sensor is 60 meters or 196 feet. Testing showed a blind spot of 1-2 inches which was avoided by installing the sensor back a little over two inches.

F15 243 Fury lidar sensor.jpg

The Battery sensor interface was an ADC pin to read the value then apply some calculations to get the approximate value.

Sensor Pin layout
Pin Name Function
P2_0 PWM for left Sonic Sensor
P2_1 RX trigger for left Sonic Sensor
P2_2 PWM for right Sonic Sensor
P2_3 RX trigger for right Sonic Sensor
P2_4 PWM for back Sonic Sensor
P2_5 RX trigger for back Sonic Sensor
P2_6 5V Regulator Flag bit
P1_30 ADC from RC Battery
P1_31 ADC from 5V source for all Boards
SDA 2 LIDAR I2C data
SCL 2 LIDAR I2C clock

Software Design

For the sensor, we created two tasks to complete the sensor software design. The first task was to initialize the pins for the sonic sensor and create the interrupts for each of the sonic sensors. In the run phase of the task, we trigger the reading pin and use interrupts to get the length in us on the PWM pin. We repeat for each of the three sonic sensors which will have a 45 ms delay between the next triggering of the sonic sensor. The LIDAR is sampled through I2C at the same time as the first sonic sensor it sampled. After all three sonic sensor have data, we applied a simple filter to eliminate bad values. Finally we values from all the sensor are put into a queue that the periodical function will check every 10 Hz and send out a CAN message.

For the Battery sensor was in a separate task that would be sent out everyone 1 Hz. This task initialized the ADC pins and an interrupt for the flag bit from the voltage regulator. In the run phase we read the value of each ADC and place them in a queue with the flag bit value. To get the voltage level of the battery we took the percentage based on the max ADC value and multiple it by the battery's original value.

            BattSen.MotorBattery = ((adc0_get_reading(4)*7.4 * 10) / 4096);
            BattSen.BoardBattery = ((adc0_get_reading(5)* 5 * 10) / 4096);
            BattSen.BatteryFlag = BoardBatteryFlag;
            xQueueSend(battery_data_q, &BattSen, 0);
            return true;
Battery Software Flow Chart
LIDAR Software Flow Chart
Sonics Software Flow Chart

Implementation

The communication method for the sonic sensors is to use a PWM pin with and interrupt to find the distance. The LIDAR used I2C to send a 16 bit distance value and the battery sensor used ADC. To communicate with the other boards, we used the below CAN messages.

Sensor Controller Communication Table
Sr. No. Message Number Destination Message Name (MSG_FUNCTION) Data Layout of Data Sent over CAN (byte[0] = total number of data bytes)
1 0x140 Master HEARTBEAT
-
2 0x142 Master SONIC SENSOR DATA
Msg : byte[0:1]   : (uint16_t)   middle (LIDAR)
Msg : byte[0:1]   : (uint16_t)   left
Msg : byte[2:3]   : (uint16_t)   right
Msg : byte[4:5]   : (uint16_t)   back
3 0x144 Master & I/O Controller BATTERY DATA
Msg : byte[0]   : (uint8_t)   Motor battery * 10
Msg : byte[1]   : (uint8_t)   Board battery * 10
Msg : byte[2]   : (uint8_t)   Board battery Flag

Testing & Technical Challenges

  • For the sonic sensor the biggest challenge was preventing the sensor from interfering with each other. While testing the sensor would get incorrect values if the time between triggering was too short. I notice with a 30 ms delay that the sensor seemed to be working correctly but when an object was placed on the right side of the car the left sensor would react. By placing a delay of 45 ms I was able to only see the right sensor react and the left remain the same.
  • The next issue during testing was getting value from the sensor that were greater than the device was capable of having. By applying a simple filter to weed out bad value allows the master only to receive good values.

Geographical Controller and Compass

Group Members

Schedule

Sl.No Start Date End Date Task Status Actual Completion date Problems Encountered
1 9/23/2015 10/2/2015 Researched and decided upon the GPS module and Compass module. Completed 10/1/2015 None
2 10/3/2015 10/3/2015 Ordered GPS module and compass module. Completed 10/2/2015 None
3 10/5/2015 10/14/2015 Interface GPS module and

compass module to SJOne board.

Completed 10/20/2015 The delivery of GPS and compass module was delayed.
4 10/15/2015 10/25/2015 Parse GPS data and format the data to be transmitted

Test code to get compass reading information

Completed 10/25/2015 None
5 10/26/2015 10/30/2015 Calibrating the compass module.

Integration of GPS and compass module. Interfacing of GPS and compass module to Android.

Completed 11/25/2015 Testing of the module is taking time.

Burnt GPS module, had to order another one.

7 11/1/2015 11/13/2015 Integration with Master through CAN bus. Completed 12/05/2015 Had to filter the data
8 11/15/2015 12/10/2015 Testing and calibrating with other modules. Completed 12/16/2015 Tuning

Hardware Design

GPS Module
CMPS11 Module
GPS Antenna

GPS Module

GPS module used in our project is Sparkfun Venus GPS - (Model: GPS-11058) and embedded antenna from Sparkfun - (Model: GPS-00177). We were able to configure this module at 10Hz and communicate at 38400bps through UART. Sparkfun has developed a Graphical User Interface to check Latitude, Longitude and every possible information this GPS module provides. GPS can also be configured to operate and communicate at various speed though the provided Graphical User Interface. This module has got an on-board flash to store these configuration. There are three modes in which this module can operate,

1. Cold start: Cold Start is performed every time when the GPS module is turned off without backup power supply connected. It is the longest starting time out of the three. It usually took around 15 to 20 minutes to get a GPS fix indoors.

2. Hot start: GPS module will perform Hot Start if the GPS module is provided with backup power and is powered on any time within the 2-hour time frame after GPS was previously turned off, the required fix is still stored inside the its flash memory and will not be changed. The Hot start time is typically around 10 to 15 seconds.

3. Warm start: Warm Start is performed if the module is switched on after the 2-hours of time, since satellite data has to be refreshed. Warm start time is typically around 2 to 3 minutes.

Compass Module

Compass module used for our project is CMPS 11 by Devantech Ltd(Robot Electronics). It is tilt compensated module which made life easier for us. There are two ways to establish communication between CMPS 11 and SJ-ONE board. UART and I2C are the two ways and we choose to do use I2C for communication. Since, it is faster.

1. First thing to do before calibrating the compass module is to make sure that there is proper I2C communication established between the compass module and SJ-ONE board. Once we have communication setup we can got ahead and find out the bearing degree of the compass and verify it with an actual analog compass.

2. Once the communication is setup and working as desired, then we can calibrate the compass. Calibration is done by sending 3 commands for every 20ms. The purpose of calibration is to remove sensor gain and offset of both magnetometer and accelerometer and achieves this by looking for maximum sensor outputs.

Hardware Interface

GPS module

Communication between GPS and SJOne board is through UART2. GPS was configured to communicate at 38400bps and operate at 10Hz. A coin battery of 3.3V was connected between Vbat and Gnd of GPS. The coin battery helped in hot start of GPS module.

Compass module

CMPS 11 module provides two ways of communication. First option is I2C and second option is UART. We chose I2C communication since it is faster when compared to UART. Since GPS uses UART2 and Seven segment display uses UART3 we decided to use I2C. The operating voltage range is from 3.3v to 5v.

Just a word of caution

1. Don't use 5v supply because for us it somehow created more than expected offset and our initial testing failed because of it. Later we switched back to 3.3v and offset was in expected range and testing went well too.

2. When working with CMPS 11 don't get laptops, smartphones or any ferrous object close to it because the calibration of the compass will be dislodged.

Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

GPS module

A task is created to read the GPS values from the module. This task starts reading the input when there is some data on the received queue which is basically every 100ms, since the GPS module is configured to work at 10Hz. Data from communication module is received at the start of code which contains checkpoint details. The GPS data and the checkpoint data is used to calculate the distance to next checkpoint, distance to final destination and angle in which the car has to head by using Haversine formula. Once a checkpoint is reached, the checkpoint is updated and continues till final destination is reached. Once the final destination is reached, master is informed about the same. Present GPS data is transmitted back to communication bridge.

Compass module

All of compass calculation is done in 10Hz periodic task. Initial bearing is calculated and compared with the desired heading. The desired heading is calculated using the longitude and latitude values provided by the GPS module. Based on this value a turn decision is made and sent to the master to handle it.

1. For entering into the calibration mode, switch 1 on SJ- One board has to be pressed. 2. Switch 2 to come out of calibration mode back to heading mode. 3. Switch 3 to do the factory reset setting.

Algorithm to calculate distance using longitude and latitude values.

Algorithm to calculate desired heading using longitude and latitude values.

Controller Communication Table

GEO Controller Communication Table
Sr. No. Message Number Destination Message Name (MSG_FUNCTION) Data Layout of Data Sent over CAN (byte[0] = total number of data bytes)
1 0x160 Master HEARTBEAT
-
2 0x162 Master and I/O COMPASS HEADING DATA
Msg : 8 bits  : turn angle
Msg : 7 bits  : checkpoint 
Msg : 1 bit   : isFinal
Msg : 16 bits : distance to final destination
Msg : 16 bits : distance to next checkpoint
3 0x461 Communication Bridge GPS DATA
Msg : 8 bits  : latitude_decimal_part
Msg : 20 bits : latitude_float_part
Msg : 8 bits  : longitude_decimal_part
Msg : 20 bits : longitude_decimal_part
Msg : 7 bits  : checkpoint 
Msg : 1 bit   : isFinal
4 0x47F Communication Bridge CHECKPOINT RECEIVED
-

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.


On board LED 3 is toggled every time there is an error to push the data onto queue. On board LED 4 is toggled every time the data is not read from gps.

The sparkfun has developed a software to read the GPS value. The GPS module has to be connected to the laptop through a USB to Serial converter and then GPS value can be read without any difficulty. Vbat of around 3V has to be connected. The software has all the options to configure the module. Once done, it can be connected to SJOne board to read and parse the data. Initial fix, for the new module takes a while, once the initial fix is achieved, every time the GPS module is turned on, it takes very little time to get the correct GPS data.

Android & Communication Bridge Controller

Group Members

  • Chinmayi Divakara
  • Praveen Prabhakaran

Schedule

Sl.No Start Date End Date Task Status Actual Completion date Problems Encountered
1 9/30/2015 9/30/2015 Decide and purchase Bluetooth Module Completed 9/30/2015 None
2 9/30/2015 10/14/2015 Develop Basic Android App with Bluetooth Sensor Communication Completed 10/14/2015
3 10/15/2015 10/20/2015 Interface Bluetooth Module with SJSU Dev Board Completed
4 10/12/2015 10/26/2015 Be able to send bi-directional arbitrary messages between Android App and Dev Board via Bluetooth Completed
5 10/14/2015 11/21/2015 Interface Bluetooth Module with CAN
6 10/26/2015 11/30/2015 Integration with GPS module testing and fine tuning.
7 11/01/2015 11/13/2015 Integration with Master through CAN bus
8 11/15/2015 12/10/2015 Android App GUI enhancements (Google Maps, Google Drive)

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

  • For wireless communication between the SJSU One Board and a Android device, a Bluetooth (RN-421) module is used. This module was chosen because it can connect and mount directly onto the SJSU One Board's XBee breakout socket.
  • To give a longer range communication, we used wireless mesh network (Nordic) which was available in SJOne board.

1. Bluetooth Module (RN-421):

Bluetooth Module

Features:

  • Fully qualified Bluetooth version 2.1 module, support version 2.1+Enhanced Data Rate (EDR)
  • Backwards compatible with Bluetooth version 2.0, 1.2 and 1.1.
  • Low power (26uA sleep, 3mA connected, 30mA transmit)
  • UART (SPP or HCL) and USB (HCI only) data connection interfaces.
  • Sustained SPP data rates: 240 Kbps (slave), 300Kbps (master).
  • HCI data rates: 1.5 Mbps sustained, 2.0Mbps burst in HCI mode.
  • Bluetooth SIG certified.
  • Castellated SMT pads for easy and reliable PCB mounting.
  • Certifications: FCC, ICS, CE
XBee Socket Schematic

2. Nordic Wireless:

[[File:
Wireless Module

Features:

  • Worldwide 2.4GHz ISM band operation.
  • Common RX and TX interface.
  • Low power 1.9 to 3.6V supply range.
  • 250kbps, 1 and 2Mbps air data rate.
  • 1 to 32 bytes dynamic payload length.
  • 3 separate 32 bytes TX and RX FIFOs
Nodic Schematic

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

System Block Diagram

Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Communication Bridge + Android Controller Communication Table
S.R. Message Number Destination Message Name (MSG_FUNCTION) Data Layout of Data Sent over CAN (byte[0] = total number of data bytes)
1 0X180 Master HEARTBEAT
No DATA
2 0X180 Master DRIVE MODE
Msg : byte[0] 0 to start, 1 to stop
3 0x181 Master LOCATION POINTS
Msg : 8 bits  : latitude_decimal_part
Msg : 20 bits : latitude_float_part
Msg : 8 bits  : longitude_decimal_part
Msg : 20 bits : longitude_float_part
Msg : 8 bits  : checkpoint 

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Integration

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

My Issue #1

Discuss the issue and resolution.

Issue 1:

Full CAN was implemented to receive the required data. During CAN communication, when a particular message intended to receive for one particular module was received, the SJOne board of that module used to get stuck, there was no watchdog timer reset as well.

Solution - The Full CAN messages had to be added in ascending order. Once this was implemented, the working was smooth.

Conclusion

Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?

Project Video

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Project Source Code

References

Acknowledgement

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References Used

List any references used in project.

Appendix