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SparkFun VKey Voltage Keypad

Name: SparkFun VKey Voltage Keypad
Brand: Sparkfun
SKU: PTR003564
Price: 16.05 EUR
Availability: InStock

This is the SparkFun VKey Voltage Keypad, a simple board that adds a keypad to your microcontroller project without using multiple I/O pins.

Referência: PTR003564

16,05 €

Com IVA

Descrição

SparkFun VKey Voltage Keypad

This is the SparkFun 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.

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