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Describe your issue:
Is there any way to display the current voltage and amp draw of the raspberry pi on the klipper interface?
I would like to keep an eye on the voltage to look for voltage drops.
First off, you’re going to need something that will measure the voltage and current going into the rPi. There are a number of devices available that will do this and provide data output for logging but, before you go there, could I suggest starting with something like this:
Cheap and will record within the device for up to 999 days & 59 hours with a sample every second.
I would recommend buying the resistive load (it adds a buck or so to the total cost) to go with it as you can give your USB power supply a pretty good test away from the rPi without the possibility of things crashing under load.
Thanks for the reply, I shall definitely look into one of these.
I’ll clarify as to why I want to measure the voltage of the pi.
I have 2 Ender 3 printers, both running klipper.
The first printer runs klipper via a raspberry pi 4b which uses the official raspberry pi power supply. This printer doesn’t suffer any voltage issues and runs fine.
The second printer runs klipper on a raspberry pi 3b, with a meanwell 5v power supply which runs off the printers 24v power supply, which reports an unvervolt error of 4.65v when running.
If I’m printing on the printer that’s running the meanwell supply and turn on the other printer that’s running the official supply, the first printer shuts down, with klipper reporting an mcu shutdown error.
I’m not sure how there is interference between the two printers as both run on seperate power supplies, the only thing they share in common is that they share the same power strip.
Hence why I would like to monitor the voltages on both via the web interface.
Personally, I’d start small and cheap that does the basic job and then decide what to do. Maybe you’re maxing out your power strip, maybe you need a surge supresser on the printer with the “official supply” but it could be something else that’s going to be expensive.