This micro:bit FSR Pressure Sensor is specifically designed for micro:bit to detect pressure. It includes a force sensitive resistor (FSR) with a square, 1.75x1.5", sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The circuit board will then convert the resistance to voltage for easy interfacing to micro:bit. The harder the force, the higher the output voltage.
This FSR can sense applied force anywhere in the range of 100g-10kg. These sensors are simple to set up and great for sensing pressure, but they aren't incredibly accurate. Use them to sense if it's being squeezed, but you may not want to use it as a scale.
- Datasheet (FSR)