{"product_id":"38-1mm-1-5-square-force-sensitive-resistor-fsr","title":"38.1mm (1.5\") Square Force Sensitive Resistor (FSR)","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe \u003cstrong\u003e38.1mm (1.5\") Square Force Sensitive Resistor (FSR)\u003c\/strong\u003e is a robust, polymer thick film (PTF) device that exhibits a decrease in electrical resistance when force is applied to its active surface. Designed to measure dynamic pressure, this piezoresistive sensor is essentially a variable resistor. When no pressure is applied, its resistance is extremely high (nearly an open circuit). As you press harder on the 38.1mm square pad, the resistance drops linearly with the increase in force.\u003c\/p\u003e\n\u003cp\u003eBecause of its large sensing area, this square FSR is incredibly versatile. It is exceptionally easy to interface with microcontrollers like Arduino, ESP32, and Raspberry Pi Pico using a simple voltage divider circuit. While it is not designed to replace high-precision load cells for exact weight measurements, it is absolutely perfect for detecting relative pressure, human touch, or physical impacts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeople also search for:\u003c\/strong\u003e square force sensor, 38.1mm fsr, fsr 406 alternative, pressure pad sensor, arduino touch pressure sensor, piezoresistive pad.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Force Sensitive Resistor (Piezoresistive)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive Sensing Area:\u003c\/strong\u003e 38.1mm x 38.1mm (1.5\" x 1.5\" Square)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForce Sensitivity Range:\u003c\/strong\u003e ~100g to 10kg (approximate)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActuation Force:\u003c\/strong\u003e ~10g (Minimum force required to drop resistance below 100KΩ)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloaded Resistance:\u003c\/strong\u003e \u0026gt; 1 MΩ (Typically infinite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResponse Time:\u003c\/strong\u003e \u0026lt; 3 microseconds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -30°C to +70°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e ~0.45mm to 0.55mm (Ultra-thin profile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector:\u003c\/strong\u003e Standard 2-pin breadboard-compatible spacing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eApplications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobotics:\u003c\/strong\u003e Tactile feedback for robotic grippers to detect when an object is being held and how hard it is being squeezed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic Musical Instruments:\u003c\/strong\u003e Creating velocity-sensitive electronic drum pads or custom MIDI controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInteractive Installations:\u003c\/strong\u003e Hidden touch switches or pressure-sensitive floor mats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHealth \u0026amp; Fitness:\u003c\/strong\u003e Foot pressure distribution mapping or bed occupancy sensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGaming:\u003c\/strong\u003e Analog pressure-sensitive buttons for custom gamepads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eUsage Notes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring (Voltage Divider):\u003c\/strong\u003e To read this sensor with an Arduino's analog pin, you must use it in a voltage divider circuit. Connecting a 10KΩ to 100KΩ pull-down resistor from the analog pin to GND is highly recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a Load Cell:\u003c\/strong\u003e FSRs are great for detecting \u003cem\u003erelative\u003c\/em\u003e force (e.g., \"is it being pressed?\" or \"is it being pressed hard?\"). They are typically accurate to within ±10% and should not be used as digital scales for precise weight measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e For best results, place the FSR on a firm, flat, and smooth surface. Applying force via a soft or uneven material will distribute the pressure poorly and result in inaccurate readings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003ePackage Includes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 38.1mm Square Force Sensitive Resistor (FSR)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Tomson Electronics","offers":[{"title":"Default Title","offer_id":48266703274222,"sku":"SEN-28675","price":229.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/FORCESENSOR38.1MMSQUAREIMP.jpg?v=1783429437","url":"https:\/\/www.tomsonelectronics.com\/products\/38-1mm-1-5-square-force-sensitive-resistor-fsr","provider":"Tomson Electronics ","version":"1.0","type":"link"}