This implementents a rudimentary emulation for the acceleration sensor of the Toniebox to replace it with buttons. It is tested with the CC3200 Variant. The CC3235 may work. The ESP32 based box has a different acceleration sensor and is not supported! Using GP10 and GP11 is recommended, as it combines all functions in two buttons.
I did this mod without deep electrical knowledge. The voltage regulator should be able to handle the extra as the DAC is also connected to it. If there is anything bad, please let me know. If this breaks your box, don't blame me or Tonies!
As I cannot cut the power of the pico, it need around 1mA when the box is off. When the box is running 30-50mAs extra.
Please cut the VDD of the MMA8451Q (blue) marked with the red line. Just use a sharp knife and do the cut as the line suggest. Afterwards check if the vias above the line and the capacitor below are not connected anymore.
Hint: If you want to remove this mod, you'll just need resolder this connection and the MMA8451Q works again.
| Pico | Toniebox | Function |
|---|---|---|
| GND | GND | Ground (pink) |
| GP03 | MMA-INT | IRQ pin (blue) |
| GP04 | TP351 | SDA |
| GP05 | TP350 | SCL |
| GP14 | TP48 | Sleep detection |
| 3V3 | TP52 | Power |
| Pico | Function |
|---|---|
| GP06 | Tap right |
| GP07 | Tap left |
| GP08 | Tilt left |
| GP09 | Tilt right |
| GP10 | Short = tap right, hold = tilt left |
| GP11 | Short = tap left, hold = tilt right |
| GP10+11 | Hold both = box is headsdown |
| BOOTSEL | Short = tap left, hold = box is headsdown |
Follow the instructions in Getting started with Raspberry Pi Pico to setup your build environment. You'll also need pico-extras! Then:
git clone https://github.com/toniebox-reverse-engineering/pico_i2c_slave-tonieboxcd pico_i2c_slave-tonieboxmkdir build,cd build,cmake ../,make- copy
example_mem/example_mem.uf2to Raspberry Pico - open a serial connection and check output
- Pico as I2C slave - basic setup using raw registers
- DroneBot Workshop - building an I2C sensor
- Valentin Milea valentin.milea@gmail.com (I2C_Slave lib)
- 0xbadbee aka. SciLor (MMA8451Q emulator)