I am not sure this is the correct category, but I am looking to source an industrial keypad (either 3 x 4 or 4 x 4) that will work with Arduino. I intend to connect it to a I2C bus through a I2C module.
Thanks ahead of time.
Not sure what you mean with "Industrial keypads", anyway to interface an I2C keypad like a 4x4, you could use a PCF8574 module. It acts as an I2C interface, allowing Arduino to read the keypad's state over the I2C bus.
I mean modules like those (never used, so I can't give you more advise than that, sorry):