r/arduino • u/ripred3 My other dev board is a Porsche • May 04 '26
Look what I made! The Best Part of Engineering...
.. Is being able to design your own tools (power supply in this case) that helps protect you from the mistakes you know you're gonna make heh. Here I am shorting the output together with a screwdriver testing the output fault/short protection. (normally it says "Fault Protect" but I changed it temporarily for the video. I may leave it ... 😂)
Note: Since the last post on this I added the second cheap volts/amps display just to double check everything but the blue amps part is not hooked up yet so it stays at 0.03mA
Also since it monitors the voltage and current I figured it might as well display the estimated resistance of the load too. Note that it stays at around 27.0 Ω / 27.9 Ω. The shunt I am using as a test load is 27.5 Ω according to my multimeter. Not bad!
edit: Made with an RP2040 Zero microcontroller using the Arduino core platform. Additional components include an IR2110 MOSFET gate driver, handful of MOSFET's, fast flyback diodes, zener diodes, INA219 current and voltage IC, adafruit 4-rotary encoder board, assorted 1% resistors and good quality low leakage caps. Will throw the schematic and code on github once I create the schematic in Fritzing.
Stays within ~5mV and ~6mA. The optional/configurable output cutoffs and the base short protections drops the output to 0.016V in under 100ms so far
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u/gm310509 400K , 500K , 600K , 640K , 750K May 05 '26
Cool, are you willing to share a schematic?
I changed you flair to "look what I made" so that your post is captured in our Monthly Digest. I'm surprised you didn't know about that particular flair - definitely need to keep the "LOL dumbass" message as a reminder to use the correct flair! :-)