Pedal that detects foot pressure
Summary
To address driver safety needs, a pressure sensitive pedal was added to the truck. To model driver foot force, a Force Sensitive Resistor (FSR) was added beneath the pedal cover. To make the analog output digital, a Schmitt Trigger designed around an LM741 Op-Amp was used.
Photos
Fig. 1: FSR needed to detect a force of up to 32lbs and the Schmitt Trigger was set to an equivalent resistance of 2lbs.
Fig. 2: Circuit layout with adjustable trigger point.