I’m new with the Photon and Particle environment.
I want to connect my MPR121 Capacitive Keypad to my Photon via I2C communication. But I can’t find out how I initialize and setup it in my software.
I’m nether sure about the hardware setup. I know SDA -> D0 and SCL -> D1, but not sure with IRQ -> # ?
Hope someone can help me witht this setup. I want the opportunity to touch an passcode on the keypad, and get it into my code.