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Product Description
This ADkey brick is based on VOLTAGE DIVIDER method. It use 1 AD port to detect 5 keys' input. Divider resistance ladder are built by: 0Ω,75Ω,330Ω,1K5Ω,4K7Ω,1K 
Corresponding output levels are 5V,4.6V,3.75V,2V,0.88v, 10% expected error exisits due to resistor precision and Output voltage. More over,you can add your own mark into the button by simply remove the transparent hat. Please refer to http://www.avr-asm-tutorial.net/avr_en/keypad/keyboard.html for more details.
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