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Haha projects??? Oh ya, I hear ya. One thing I've kinda noticed is that those breadboard connections are not great low resistance conductors. Those breadboard wires can drop more V than I thought typical and you have to take Ω from the wire going in and out into account. I've had issues with...

Some have thrown a 10uF cap between EN pin and GND pin which seems to alleviate the issue. You can increase Vin to 5.4V-5.6V and some have found that to be a remedy. (After looking at your link it looks as if there's an extra diode in the esp32, and that would make sense as to why a bit...

@lazaah You could throw a cap + 5V zener across Vin to smooth any ripple. Oversize the cap, I'd try a 100μF to start and if I didn't have a scope to check. You can add a cap + linear regulator between your PS and esp. Although might be less impactfulful than anticipated because LDO's are not...

Cool

Or could just change the PID constants in your code?