Seeed Studio Studio Grove Round Force Sensor (FSR402) - Analog Pressure Sensor Module

The FSR402 provides an analog resistive output. The resistance between its two signal pins decreases as force is applied to the circular sensing area. To read it with a microcontroller like an Arduino, you typically create a voltage divider circuit using a fixed resistor (e.g., 10kΩ) and connect the junction to an Analog Input (ADC) pin. The Grove module simplifies this by providing a direct analog signal (SIG) pin.

No, the FSR402 is not recommended for accurate, calibrated weight measurement. Its response is non-linear and highly dependent on the contact area and point of force application. It is best used for detecting pressure presence, threshold activation (e.g., on/off states), or relative force changes in applications like touch interfaces, robotic tactile feedback, and simple pressure mapping.

Connectivity is simplified via the Grove 4-pin cable. For Arduino: Plug the cable into the sensor and connect the other end to an Analog Grove port (e.g., A0) on a Grove Base Shield mounted on the Arduino. For Raspberry Pi: Use a GrovePi+ or similar HAT with analog inputs. The cable carries VCC (3.3V/5V), GND, and the analog signal (SIG). The fourth pin (NC) is not connected.

The module operates from 3.3V to 5V DC, making it compatible with most microcontroller platforms. Current draw is minimal, primarily determined by the chosen pull-up/pull-down resistor value in your external voltage divider circuit (if not using the Grove analog port's internal reference). Typical current is in the microamp range when idle.

This indicates the sensor's mechanical lifespan was tested under specific conditions (1kg force applied at 4Hz) for over 10 million cycles, with an average resistance change of less than -10%. This high cycle life makes it suitable for frequently actuated buttons, pedals, or interactive surfaces in consumer electronics, robotics, and industrial control prototypes.