VKey Voltage Keypad 3x4 (Sparkfun PRT-12080) output analog voltage

This is the VKey Voltage Keypad, a simple board that adds a keypad to your microcontroller project without using multiple I/O pins. This keypad has 12 pushbutton switches in a 3x4 array. The VKey operates by outputing an analog voltage to encode which key has been pressed, which can be read by an analog to digital converter on a microcontroller on a single input pin.

Traditional digital keypad interfacing techniques can require a large number of digital I/O lines. On a small controller, there may not be many I/O pins left for other tasks. The VKey operates at a voltage of 3.3-5.5V and features a dual opamp which is used as a current source and buffer amplifier.

Documents:

• Schematic
• Eagle Files
• Datasheet (LMV358)
• Hookup Guide
• GitHub
• Product Video