Some of STM32 MCUs are equipped with TSC (Touch Sensing Controller), whose hardware performance is not bad compared to ASIC solutions. It is a self-sufficient module supporting multi-touch. And you can lower the power consumption down to few tens of micro amps. Setting up the TSC requires to select one port for sampling for each group. One group consists of one sampling channel, where a sampling capacitor is connected, with one or more measurement channel, where a sensor pad is connected. Charge transfer happens from a measurement channel to the sampling channel. This is done independently from other groups. Thus channels belongs to each group are measured at the same time. In the same group, however measurement should be done sequentially among channels. A PCB touch panel (on the right) is connected to a STM32L052 MCU. The MCU is programmed to measure the touch sensor value at every 100 msec. It transfers the measurement to a PC via UART connection. On the PC side, a py...