via Seeed Studio
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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.
Please refer to here for more details.