Difference between revisions of "S16: Laser Harp"
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=== Implementation === | === Implementation === | ||
MIDI Task Algorithm | MIDI Task Algorithm | ||
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1. Sleep while queue is empty. | 1. Sleep while queue is empty. | ||
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2. When a note is received, a message is sent to MIDI to turn note on. | 2. When a note is received, a message is sent to MIDI to turn note on. | ||
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3. Return to sleep. | 3. Return to sleep. | ||
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4. Repeat. | 4. Repeat. | ||
Revision as of 05:13, 24 May 2016
Contents
Grading Criteria
- 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.
Project Title
Laser Harp
Abstract
Our plan is to design a budget version of a laser harp. This can be accomplished using infrared LEDs and infrared sensitive photodiodes. The two diode system will emulate strings of a harp. When the infrared sensor has detected an note that is played, the microcontroller will read the input from the ADC and send out a control signal to the MIDI board and the corresponding sound will play from the speaker. Controls include changing the loudness of the speaker.
Objectives & Introduction
Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.
Team Members & Responsibilities
- Abraham Carrillo
- Sensor Circuit Design
- Interfacing Sensors with ADC
- Frame Assembly
- Kristen Kan
- Interfacing MIDI with SJ One Board/Sensors
- Power Supply Circuit Design
Schedule
Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.
| Week# | Date | Task | Status | Problems |
|---|---|---|---|---|
| 1 | 4/3 | Finalize following circuit designs and order parts
1. MIDI 2. ADC 3. Power Supply |
Complete | |
| 2 | 4/10 | 1. Interface MIDI with SJ One Board
2.Test recording and sound projection |
Complete | |
| 3 | 4/17 | 1. Lay out ADC, sensors, and power supply on prototype board
2. Calibrate sensors 3. Write drivers for ADC circuit |
Complete | |
| 4 | 4/24 | Basic input/output testing | Complete | |
| 5 | 5/1 | Volume/Instrument/Octave Changing | Complete | |
| 6 | 5/8 | Design improvements (Range/Sensitivity/Control) | Complete | |
| 7 | 5/15 | Final product testing | In-Progress | |
| 7 | 5/24 | Demo |
Parts List & Cost
| Part | Quantity | Price (Total) | Description |
|---|---|---|---|
| SJOne Board | 1 | $80 | Main microcontroller |
| Adafruit VS1053 Board | 1 | $25 | Sound Decoder, used to produce sounds |
| MCP3008 | 1 | $2.32 | Analog to Digital Converter |
| SFH 4550 | 7 | $2.87 | Infrared 850 nm diode |
| SFH 213 | 7 | 3.08 | Infrared Photodiode |
| 220 Ohm resistor | 7 | $0 | |
| Part | # | $ | |
| Part | # | $ |
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.
Hardware Design
Discuss your hardware design here. Show detailed schematics, and the interface here.
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
There are two tasks: the MIDI Task(consumer) and the ADC Task (producer). Data is sent between modules over SPI and the value in which a sensor has been triggered is stored in a FreeRTOS queue. The consumer task sleeps while waiting for the queue to receive a value.
The MIDI Task handles sending commands to the VS1053, which includes turning notes on/off, changing volume, and changing instrument. Communication is done with the SJ One Board through SSP1. When a note is received in the queue, the task wakes and processes the note type.
The ADC Task handles reading values from the sensors through the ADC converter by looping through every channel and checking if the value is above 835. If it is, it sends a corresponding note type to the queue, which signals the MIDI to play a note. This task also includes the volume and instrument controls, because the MIDI Task may be asleep when the button is pressed. Communication is done with the SJ One Board through SSP0.
Implementation
MIDI Task Algorithm
1. Sleep while queue is empty.
2. When a note is received, a message is sent to MIDI to turn note on.
3. Return to sleep.
4. Repeat.
ADC Task Algorithm 1. Read 'change volume/instrument' push buttons. 2. If active, perform relevant functions. 3. Read ADC channels 0-7 via SPI. 4. If data is below a certain value for channels 1-7, the note to be played is sent to the queue. 5. A message is sent to MIDI when the data returns to default to turn the note off. 6. Repeat.
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
Talk about voltage drop?
My Issue #2
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
Upload a video of your project and post the link here.
Project Source Code
References
Acknowledgement
Any acknowledgement that you may wish to provide can be included here.
References Used
List any references used in project.
Appendix
You can list the references you used.
