DFRobot Gravity Digital Crash Sensor Left - Micro Switch Module for Arduino

The module is designed for a 5V DC supply. The digital output is compatible with both 5V and 3.3V logic levels, making it safe to use with modern microcontrollers like the Arduino Uno (5V) or ESP32 (3.3V) without requiring a logic level shifter.

Connect the module's 3-pin Gravity connector: VCC to 5V, GND to ground, and the Digital Output pin to any digital input pin on your microcontroller. The onboard pull-up resistor holds the output HIGH when the switch is open. When the switch is actuated, the output goes LOW. You can read this state using a simple digitalRead() function in Arduino.

The roller lever is typically a fixed part of the standard micro switch used on this module. However, many micro switches have a standardized actuator design. For specific applications, you may be able to carefully modify the lever or source a compatible switch with a different actuator length or style, though this may require desoldering and could void any warranty.

This module uses a standard snap-action micro switch, which requires a specific actuation force (typically in the range of tens to hundreds of grams-force) to trigger. It is designed for definitive mechanical contact, such as a robot bumping into a wall or a carriage hitting an end-stop. It is not sensitive enough for detecting very light touches or vibrations; for that, a force-sensitive resistor or piezoelectric sensor would be more appropriate.