F15: Electronic Piano - Revision history

Preet: /* Grading Criteria */

2015-12-19T17:56:01Z

‎Grading Criteria

Proj user21: /* Abstract */

2015-12-19T08:15:58Z

‎Abstract

Proj user21: /* Abstract */

2015-12-19T08:15:49Z

‎Abstract

Proj user21: /* Hardware Design */

2015-12-19T07:42:53Z

‎Hardware Design

Proj user21: /* Motion Controlled Electronic Piano */

2015-12-19T07:41:50Z

‎Motion Controlled Electronic Piano

Proj user21: /* Motion Controlled Electronic Piano */

2015-12-19T07:41:27Z

‎Motion Controlled Electronic Piano

Proj user21: /* Issue #2-LED driver soldering */

2015-12-19T07:31:19Z

‎Issue #2-LED driver soldering

Proj user21: /* Issue #3-Noisy power supply */

2015-12-19T07:23:25Z

‎Issue #3-Noisy power supply

Proj user21: /* Issue #3-Noisy power supply */

2015-12-19T07:18:35Z

‎Issue #3-Noisy power supply

Proj user21: /* Software Design */

2015-12-19T07:14:11Z

‎Software Design

← Older revision		Revision as of 17:56, 19 December 2015
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−	~~=== Grading Criteria ===~~
−	~~<font color="green">~~
−	* How well is Software & Hardware Design described?
−	* How well can this report be used to reproduce this project?
−	* Code Quality
−	* Overall Report Quality:
−	** Software Block Diagrams
−	** Hardware Block Diagrams
−	**: Schematic Quality
−	** Quality of technical challenges and solutions adopted.
−	~~</font>~~
−
	== Motion Controlled Electronic Piano ==		== Motion Controlled Electronic Piano ==
	[[File:CMPE146_F15_ElectricPiano_TopView.jpg\|framed\|boarder\|left\|text-top\|Top view of implemented board]]		[[File:CMPE146_F15_ElectricPiano_TopView.jpg\|framed\|boarder\|left\|text-top\|Top view of implemented board]]

← Older revision		Revision as of 08:15, 19 December 2015
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	[[File:CMPE146_F15_ElectricPiano_TopPlay.jpg\|framed\|boarder\|center\|text-top\|Top keys being played]]		[[File:CMPE146_F15_ElectricPiano_TopPlay.jpg\|framed\|boarder\|center\|text-top\|Top keys being played]]
	[[File:CMPE146_F15_ElectricPiano_BottomPlay.jpg\|framed\|boarder\|center\|text-top\|Bottom keys being played]]		[[File:CMPE146_F15_ElectricPiano_BottomPlay.jpg\|framed\|boarder\|center\|text-top\|Bottom keys being played]]
		+
		+

@@ Line 17: / Line 17: @@
 [[File:CMPE146_F15_ElectricPiano_TopPlay.jpg|framed|boarder|center|text-top|Top keys being played]]
 [[File:CMPE146_F15_ElectricPiano_BottomPlay.jpg|framed|boarder|center|text-top|Bottom keys being played]]
 == Abstract ==

@@ Line 209: / Line 209: @@
       [[SJ-One Board]]
-[[File:CMPE146 F15 ElectronicPiano SJOneBoardNew.png|framed|boarder|none|text-top|SJ-One Board]]
+[[File:CMPE146 F15 ElectronicPiano NewSJOneBoard.png|framed|boarder|none|text-top|SJ-One Board]]
 The SJ-One Board is powered by the 5V and ground supplied by the power circuit. The CLK pin is outputted to the VS1033D, analog to digital converters, and LED driver. The MOSI pin is outputted to the VS1033D, analog to digital converters, and LED driver. The MISO pin is only outputted to the analog to digital converters. There are also 8 GPIO output pins used for  chip selecting. P1.30 is used for selecting the VS1033D, while P2.4 is used for selecting the LED driver. Pins P1.29, P1.28, P1.23, P1.22, P1.20, and P1.19 are used for selecting between analog digital converters 0 to 5, respectively. Four GPIO inputs are used for user control. Pins P1.14 and P1.15 are used for lowering and raising the volume, respectively. Pins P1.9 and P1.10 are used for lowering and raising the note selection, respectively. LEDs 0 to 3, which are controlled by GPIO output pins P1.0, P1.1, P1.4, and P1.8, respectively, are used to display current volume, while the 7-segment LEDs represent the note selection.

@@ Line 13: / Line 13: @@
 == Motion Controlled Electronic Piano ==
 [[File:CMPE146_F15_ElectricPiano_TopView.jpg|framed|boarder|left|text-top|Top view of implemented board]]
-[[File:CMPE146_F15_ElectricPiano_PianoKeys.jpg|framed|boarder|center|text-top|Piano keys representation for 1 key short of an octave]]
+[[File:CMPE146_F15_ElectricPiano_PianoKeys.jpg|framed|boarder|center|text-top|Piano keys representation of 1 key short of an octave]]
 [[File:CMPE146_F15_ElectricPiano_SideView.jpg|framed|boarder|left|text-top|Side view of implemented board]]
 [[File:CMPE146_F15_ElectricPiano_TopPlay.jpg|framed|boarder|center|text-top|Top keys being played]]

@@ Line 343: / Line 343: @@
 === Issue #2-LED driver soldering===
-At first, the LED driver had difficulty implementing. The problem that occurred was that the soldering of the LED driver to the TSSOP to DIP20 adapter may have created a short along the way. After fixing the soldering, the data was able to be sent to the LED driver as expected.
+At first, there was difficulty implementing the LED driver circuit. After soldering the LED driver (shift register) to the TSSOP to DIP20 adapter, a short may had existed and the device was not functioning. After improving the soldering, the device functioned properly; the expected LEDs were turned on based on the data sent to it.
 === Issue #3-Noisy power supply===

@@ Line 352: / Line 352: @@
 For the second problem, false key activation can occur; infrequently, random keys would unintentionally activate without any action from the user. To mitigate the problem, IR debouncing was implemented in the software. Similar to push button debouncing, an IR key must be sampled valid active multiple times in order to play its note.
-For the third problem, an external speaker that uses the 5V USB connector of the power circuit as a source would amplify the noise and idly emit high pitch static. To mitigate the problem, an external speaker with its own power supply was used to partially isolate the noise in the supply line from the audio. Using this approach (although not an ideal solution), the high pitch static was significantly reduced.
+For the third problem, an external speaker that uses the 5V USB connector of the power circuit as a source would amplify the noise and idly emit high pitch static. To mitigate the problem, an external speaker with its own power supply was used to partially isolate the noise in the supply line from the audio. Using this approach (although not an ideal solution), the high pitch static was significantly reduced. Since the source of the noise is from the array of IR sensors, a cost effective solution is to use a passive filter to capture and isolate the noise between the power circuit and the ADC circuit.
 [[File:CMPE146_F15_ElectronicPiano_Noise_5V_Supply.jpg|framed|boarder|none|text-top|Noise in the 5V supply line]]

@@ Line 287: / Line 287: @@
 The MIDI task is responsible for playing notes at a certain pitch and volume. The task also provides feedback of the current pitch (octave) and volume using the SJ-One Board’s 7 segment display and on-board LEDs.
-The IR Key task is responsible for sampling the IR sensors by reading the values from the ADC. If a key is sampled as active, then the key’s LED activates, the key’s note and the play note command are sent to the MIDI task. The opposite occurs when a key is sampled inactive when previously in the active state such that the key's LED deactivates and the key's note is sent to the MIDI task to be deactivated.
+The IR Key task is responsible for sampling the IR sensors by reading the values from the ADC. If a key is sampled as active, then the key’s LED activates and the key’s note in addition to the note on command are sent to the MIDI task. The opposite occurs when a key is sampled inactive when previously in the active state such that the key's LED deactivates and the key's note is sent to the MIDI task to be deactivated.
 The Control task is responsible for reading user input to increment/decrement pitch or volume by sampling the SJ-One Board’s on-board push button. When an input is active, the appropriate command gets sent to the MIDI task.