Femtoduino has designed a dime sized (18mm diameter) Wi-Fi/Bluetooth wireless IMU (inertial measurement unit) that runs MicroPython:
FemtoBeacon ESP32-PICO-D4 (4MiB) wireless IMU coin
What is it?
The world’s smallest open-source Wireless IMU. It has an ICM-20948 MPU (9-axis: accelerometer, gyroscope, magnetometer), and an MS561101BA03-50 precision altimeter/temperature sensor.
The coin uses the ESP32-PICO-D4 chip (4MiB) and has all peripherals attached via SPI (hSPI).
Requires a USB to UART adapter that can provide pass-through 5V to coin VIN pin and at least 500mA to 3V3 pin.
- RGB LED, Red pin: 26
- RGB LED, Green pin: 4
- RGB LED, Blue pin: 5
- hSPI SCK pin: 14
- hSPI MOSI pin: 13
- hSPI MISO pin: 12
- MPU Chip Select pin: 15
- Altimeter Chip Select pin: 27
Why did you make it?
I made these for use in personal projects where I need a very small motion processing unit.
What makes it special?
It’s incredibly small, light weight, and open source!