A bumper car is usually driven by a crazed carnival-goer -- but we're going to build a self-driving Bumper Bot! This bot will use the Circuit Playground Express for brains and collision detection with its onboard accelerometer. The Crickit will provide all the muscle needed to drive two TT DC gearbox motors, as well as a micro servo direction indicator flag.

A small speaker and NeoPixels will also give us feedback while to bumper bot is out there having fun!!


1 x Adafruit CRICKIT
for Circuit Playground Express
1 x Circuit Playground Express
Round, Awesome Microcontroller Board
2 x TT Motor DC Gearbox
200 RPM 3 to 6VDC
2 x Orange and Clear TT Motor Wheel
for TT DC gearbox motor
1 x Micro Servo
180 degree rotation servo
1 x Male DC Power adapter
2.1mm plug to screw terminal block

Materials and Tools

  • Small and medium corrugated cardboard boxes
  • Ruler
  • Hobby knife or scissors
  • Paper clip or safety pin
  • Double stick foam tape

You can watch the John Park's Workshop livestream build of the Bumper Bot here:

This guide was first published on Jun 13, 2018. It was last updated on Mar 08, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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