Fig. 2
From: Low-cost equipment for the evaluation of reach and grasp in post-stroke individuals: a pilot study
Signal conditioning circuit of the sensor. Sensor input voltages range from 2 to 5.5 V DC. The touch module TTP-223 processes the information with a 16-MHz clock, being sensitized ≤ 60 ms after contact. The 22-pF capacitor adjusts sensor sensitivity; 100-nF and 100-uF capacitors stabilize input voltages, eliminating high- and low-frequency noise. Communication with the computer is UART, using the I2C protocol