ModMyPi MCP23017 HAT - 32 Channel I/O Expansion HAT [Discontinued] _RPI_COOLING_CASE You'll also need to program

You'll also need to program in your Teensy with the SmartMatrix code available on the project website

This new version Relay-8 module has support JSON now

Arduino uses digital pins 10

Bring colour and control to your project with this 2

Power everything with 5V DC and you’re ready to go

ModMyPi MCP23017 HAT - 32 Channel I/O Expansion HAT [Discontinued] _RPI_COOLING_CASE You'll also need to programThe MCP23017 HAT from ModMyPi is the perfect I O expansion HAT for your Raspberry Pi (any 40 pin version). The HAT features two removable MCP23017 DIP IC's, which utilise two i2c pins (which can be shared with other devices if required), and in exchange gives your Raspberry Pi an additional 32 GPIO ports! Each I O pin can be configured as an input, output or input with a pull up resistor. The MCP23017 HAT is stackable, featuring selectable i2c address