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Power filter

A project log for InspectorBot

An open source robot to inspect under vehicles, crawl spaces and any other dark dirty space you need to take a look at.

dennisDennis 10/08/2017 at 17:520 Comments

When both the motors and the controller board are powered from the same battery, motor noise can cause lots of problems for the controller. One of the best ways I’ve found to clean up the motor noise is an LC pi filter. Here is a quick easy filter to clean up the noise. To save time, I printed the boards. I added the Gerber files to both files and repository to make it easy to reproduce. It just has three components: two 47uF capacitors and one 1mH inductor.  Wires are soldered directly to the board. An input power from the battery switch, an output power connected to the motor board and a common.

Below is how the board looks and also mounted in an InspectorBot.

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