LED mouth Matrix use the MAX7219 +Touch sensor use this 2PCS TTP223 Capacitive Touch Switch Button Self-Lock Module for Arduino

Here are libraries and sketches for Otto DIY robot, with all files neccesary for LED Matrix and some features under developmnet

• Bluetooth
• rechargable lipo battery
• touch sensors
• RGB led nose
• LED matrix for mouths
• internal voltage measurment

v2 sketch is for version with 2 buttons for mode change (first button dance, second button walk+avoid, both together = react to noise) v3 sketch has only 1 button or touch sensor and changes modes on touch (dance -> walk -> react to noise -> standby -> dance....) Everything else is the same.