4 Pcs Thin Film Pressure Sensor, 0.4 mm Force Sensitive Resistor 20g–2Kg Range for Arduino DIY, Industrial Precision Measurement and Control
 
Product Features
  

         
High-quality materials: The flexible film pressure sensor is made of polyester film with excellent mechanical properties, high-conductivity materials, and nano-scale pressure-sensitive material. The top layer is a flexible film with a pressure-sensitive composite; the bottom layer is a flexible film with printed conductive traces. Ideal for Arduino prototyping, sleep monitoring, smart footwear, pressure switches, counters, medical devices, robotics, and industrial process control.
         
Durable & stable: Tested with a 6 kg weight impact, rated for millions of cycles. Low drift and tight tolerance: individual sensor resistance 3%. Activation time <0.01 s; response time <10 ms. Trigger force 20 g. Default trigger condition: sensor resistance <200 k. Operating temperature: 40 C to +85 C.
         
Packing: Each plastic box contains 4 film pressure sensors. Thickness 0.4 mm. Sensing range: 20 g6 kg. Built on a flexible PET substrate for conformal mounting on curved or flat surfaces without loss of sensitivity. Sensors are used in series with a fixed resistor; measure the voltage across the fixed resistor: Vout = Vcc * R0 / (R0 + RS) As a rule, choose the fixed resistor R0  1/3 to 1/2 of the sensors application resistance range. Selecting an appropriate fixed resistor can make pressure vs. output voltage approximately linear over a certain pressure range.
         
Usage instructions: Install the sensor on a solid, flat, and smooth surface. Protect it from sharp objects. Use a cover layer (polycarbonate film or elastomer) for protection. The sensor material is not recommended for direct liquid contact and requires waterproofing if exposed. Overload will not permanently damage the sensor; it will return to normal operation after the load is removed. For designs involving motion, use soft rubber or a spring as part of the trigger mechanism.
         
Pressure-threshold switch application: A typical threshold switch circuit uses a Wheatstone bridge and a voltage comparator. When pressure increases and the sensor resistance drops below R1, the comparator input U1+ exceeds U1 and the comparator output goes high. The high output can trigger downstream devices (for example, a relay to control LEDs, buzzers, motors, etc.).