Looking for a poor-man’s capacitive touch sensor using only the ADC on your MCU and a couple discrete components? NXP shows how it can be done in AN11023: Capacitive Touch Sensing using the LPC11xx (here for .zip file with code). (Note: While this app note is aimed at the ARM Cortex M0 LPC11xx series of chips, the information is easily transferable to any other MCU.)
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