Whisker Switches - Very sensitive lever switches. Great for detecting objects such as other sumo bots, walls, balls, etc. Simple to wire and attach to external 'bumper' bars.
Datasheet: Omron Snap Action Switch - D2F.Pdf
If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.
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