Read about this project here
The basic idea is to create a simple instrument, with on one side the chord selection, and on the other side the note selection (within that chord).
I will use a teensy as main board for a few reason:
- Teensy are awesome
- Teensy audio library is awesome
Will be major only, minor by transposition as with the harmonica. Choice of chords, look here
The teensy 3.2 will do:
- I2S output (Pin 9,11,22,23)
- I2C to touch chip (Pin 18, 19)
- 5 setting potentiometer (Pin 14, 16, 17 ,20)
- 3 switch for fondamental select (Pin 2, 3, 4)
- 1 calibrate switch (Pin 5)
- 1 select switch (automatically go from jack to USB) (Pin 6)
| Part Name | Value | Reference document | Count |
|---|---|---|---|
| Teensy 3.2 | None | 🔗 | 1 |
| Potentiometer | 100K | 🔗 | 5 |
| 3 DIP switch | None | 🔗 | 1 |
| DP3T switch | None | 🔗 | 1 |
| CS4344 | None | 🔗 | 1 |
| QT2120 | None | 🔗 | 1 |
| KMR2 switch | None | 🔗 | 1 |
| AAA Holder | None | 🔗 | 6 |
| Jack Connector | None | 🔗 | 1 |
| Capacitor | 0.1uf | 🔗 | 2 |
| Polarised capacitor | 1uf | 🔗 | 1 |
| Polarised capacitor | 3.3uf | 🔗 | 3 |
| Polarised capacitor | 10uf | 🔗 | 1 |
| Diode | None | 🔗 | 1 |
| Resistor | 470 | 🔗 | 2 |
| Resistor | 2k2 | 🔗 | 2 |
| Resistor | 10k | 🔗 | 13 |
- Get longer pad traces for chips. This version is reflow friendly, but hard to hand solder
- The interruptor is backward, issue with trace
- The voltage drop of the diode is too high! Wrong part? Had to bypass it.
- Pots are too big. Should change version
- Should use two AAA, use a voltage converter
- Should put component more to the center to make the side more easy to cover
- Issue with jack trace, does not go through PCB hole.
- See if there is feeback on the sensors.
- Should really try to avoid vias on capacitive lines. At least put them closer to the center
- Issue with USB
- Probably needs to have a status led
- Everybody that helped me on that thread
- @otem for its polysynth