Tip: EMI Supression Capactors

[tbalatka]

I noticed that my robot would randomly drop off the network, pause, recover, then sometimes crash to the point where I had to power cycle to bring it back to life. This occurred mostly when it was in motion, especially the greater the distance from the WAP. I have been living with this since last year with my 2wd / esp32 / no onboard computer setup. This year I upgraded to a 4wd configuration, basically doubling the exiting motors....and yes, the issue only got worse. The other day I remembered taking apart toy RC cars when I was a kid, and i would find ceramic capacitors soldered to the motor contacts. So I proceeded to install 104 (100nf) capacitors on all four motors, one bridging the motor contacts, and one on each contact to ground. I will continue testing, but so far the results are noticeable.

[hippo5329]

Yes. Ceramic capacitors help. You may see them on the last photo of my robots. I used 3 cap per motor.

https://medium.com/jungletronics/dc-motors-against-back-emf-589d8ed174cc