DFRobot Gravity Digital Crash Sensor Right - Micro Switch Module for Arduino/Micro:bit

The sensor provides a simple digital output signal. When the micro switch's roller lever is actuated (pressed), the output pin switches from a high to a low logic state (or vice-versa, depending on your circuit configuration), providing a clean signal directly readable by a microcontroller's GPIO pin.

Connect the sensor using its 3-pin Gravity connector: VCC to 5V, GND to ground, and the Digital (SIG) pin to any digital I/O pin on the Arduino. The onboard pull-up resistor eliminates the need for external components. For easiest integration, use it with a DFRobot Gravity IO Expansion Shield for direct plug-and-play operation.

While the module's operating voltage is rated at 5V, the digital output signal is typically compatible with 3.3V logic inputs. However, you must power the module itself from a 5V source. Ensure your 3.3V microcontroller's input pins are 5V-tolerant, or use a simple logic level converter on the signal line to guarantee safe operation.

The roller lever extends the actuator arm, increasing the mechanical advantage and allowing detection from a wider range of angles and positions. It also reduces lateral force on the switch mechanism, improving longevity and making it suitable for applications where the triggering object may slide or roll across the sensor, such as in robotic bumpers.