Ingredients: ESP32 breakout, SSD1105 OLED (128x64), MPU-6050 IUM, Double AA battery pack Tricks: Simulates sand using cellular automata (6 simple rules)
Images for this OLED library map to the actual memory of the display. This makes for faster writing but it's more difficult to format the images.
- Make your 64x64 image
- Rotate it 90 degrees clockwise
- Mirror it horizontally
- Save as an XBM file (Gimp can do this, or https://convertio.co/image-converter/)
https://hackaday.io/project/165620-digital-hourglass
- Change MPU6050 to MPU9250
- Change LED inteface from I2C to SPI
- Use u8g2 graphic library