Keypads are very handy input devices, but who wants to tie up seven GPIO pins, wire up a handful of pull-up resistors, and write firmware that wastes valuable processing time scanning the keys for inputs? The SparkFun Qwiic Keypad comes fully assembled, making the development process for adding a 12-button keypad easy. No voltage translation or figuring out which I2C pin is SDA or SCL, plug and go! Utilizing our handy Qwiic system, no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard.
Each of the keypad's 12 buttons has been labeled 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, and # and has been formatted into the same layout as a telephone keypad, with each keypress resistance ranging between 10 and 150 Ohms. The Qwiic Keypad reads and stores the last 15 button presses in a First-In, First-Out (FIFO) stack, so you don’t need to poll the keypad from your microcontroller constantly. This information, then, is accessible through the Qwiic interface. The SparkFun Qwiic Keypad even has a software-configurable I2C address, allowing you to have multiple I2C devices on the same bus.
Note: The I2C address of the Qwiic Keypad is 0x4B and is jumper selectable to 0x4A (software-configurable to any address). A multiplexer (Mux) is required to communicate with multiple Qwiic Keypad sensors on a single bus. If you need to use more than one Qwiic Keypad sensor, consider using the Qwiic Mux Breakout.
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