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Bumper Switch

Bumper Switch (2-pack)

P/N: 276-2159

Kit includes a pair of simple bumper switches custom built for VEX Robotics. Ruggedized Bumpers allow the switch to be triggered by large impacts without sustaining damage.

  • Provide feedback to microcontroller as events "happen"
  • Rugged bumpers allow switch to be triggered without damage
  • Useful as a trigger in a variety of applications
  • Functionality is pre-programmed in the VEX Microcontroller

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More Information

Bumper Switch Sensor: The bumper sensor is a physical switch. It tells the robot whether the bumper on the front of the sensor is being pushed in or not.

Benefits:The bumper switch can help the robot avoid dangerous collision automatically.

Switch Info: SPST switch (“Single Pole, Single Throw”) configured for Normally Open behavior.

Switch Connection: Wired to normally open (OFF)

Signal Behavior: When the switch is not being pushed in, the sensor maintains a digital HIGH signal on its sensor port. This High signal is coming from the Microcontroller. When an external force (like a collision or being pressed up against a wall) pushes the switch in, it changes its signal to a digital LOW until the switch is released. An unpressed switch is indistinguishable from an open port.

Range Limits: Forces less than a pound can trigger the bumper switch (5.06 oz typical).

The bumper switch can allow a robot to navigate autonomously by avoiding hard collisions, such as hitting a wall. For example, a robot can be programmed to briefly freeze when the bumper switch is activated, and then reorient itself so that it is no longer driving towards the obstacle. Figure 2 shows where the bumper switch would be placed to be the first part of the robot to make contact with a wall or an obstacle.

Figure 2. (a) Bumper switch placement; (b) Placement close-up

Technical Specifications

(2) Bumper Switches
  • Compatible with all VEX Microcontrollers and 3-Wire Extension Cables

  • Inputs:
  • Type: Momentary

  • Outputs
  • 3-Wire Cable
    Black: Ground
    Red: No Connect
    White: Control signal

  • Weight: 0.042lbs (19.05 grams)