The IESF-R-5 Pressure Sensor is a variable resistance sensor where the output resistance is proportional to the force applied to the bulb.
The IESF-R-5 force sensor outputs a varying resistance that is proportional to the force applied to the black button at the end of the device. The resistance can then used to estimate force (or weight).
How it works
The IESF features a special rubber membrane which deflects under pressure. The membrane makes contact with a ceramic plate with resistive traces on it. As the force increases, the membrane contacts more of the resistive traces area and the output resistance drops.
A simple circuit consisting of the IESF-5-R, a 1K Ohm resistor, and an LED in series serves to demonstrate the sensors' functionality. When powered with +5VDC the LED will glow more brightly as the force on the sensor is increased.
The IESP-12 is designed for intermittent use. That is, the application of force should be temporary. Applying force for long periods can permanently damage the membrane and alter the characteristics of the device -particularly at higher force levels.
Digital scale, variable-force pushbutton, contact sensor, robotics....