I want to connect 4x4 keypad to nodemcu, but some of the pins on board are already in use. For LCD I have used I2C backpack, and have an extra lying around. Can it be used to connect keypad to nodemcu board?
From what I have read, a 8-pin I2C gpio extender can be used for keypad. But isn't the LCD backpack same as 8-pin extender? (Just having more number of pins).