Quick fix for power issues

octorian
Posts: 1
Joined: Sun Jun 03, 2018 11:15 pm

Quick fix for power issues

Postby octorian » Sun Jun 03, 2018 11:30 pm

I just built a mePed kit this weekend. After powering it up, I immediately ran into reliability issues.
After poking around here, it seems as though many of us have run into various forms of brownout issues. Personally, I had a problem where the IR receiver would detect garbage whenever the servos were buzzing. After doing some testing, it seems as though the 5V rail on mine was ~5.1V normally but dropped to ~4.5V when the servos buzzed.

Motors cause noise and voltage dips on power rails. This is a well known issue that many robot projects have to deal with. Some do it with extra filtering, careful distribution, or even multiple power sources (like my ancient WAO II that has two separate battery packs). So I was quite surprised to discover that the mePed does none of these. Anyways, I figured simply adding a capacitor to the 5V rail would help. So I did, by jamming it in the "bluetooth" connector socket, and it worked!

Image

Its a 220uF 10V electrolytic capacitor I found in one of my assortment boxes. Nothing special, but it seems to do the trick.

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