Recent content by RyanM

I finally found and fixed the issue! So after lots of testing on the board without the raspberry pi, I finally tested with it plugged in and found a short in two of my header pins. I resoldered the header pins back onto the pi and everything works again. I feel like an idiot for not checking...

I setup my blower and damper today and am just finishing off some printed parts. When I was hooking everything up I noticed the blower was working just fine. I changed the settings from pulse back to voltage and that worked well too! So it looks like whatever issue I had was involving the ATmega...

Thank you both for taking the time to help me, it's really appreciated! And great diagram Ralph, I should be able to test that circuit tonight. My replacement ATMega should be here Monday, and hopefully that fixes the issue with my LCD as well, if not do you think a new shift register is needed...

I jumpered PD3 (pin #5 on the socket) to ground and the blower output was still 12v, so I obviously fried that circuit too. So I might as well order the replacement parts for that. Looks like a diode, capacitor and a couple of mosfets? Any good way to see which one is bad, or what would fail...

Man I was really hoping it was just the ATMega that was fried, but nope, still 12v at the blower pin when I pulled the chip. I've seen a couple of threads addressing that problem, but I think I'll just replace the whole blower circuit, do you know which parts it would likely be?

That's what I'm hoping, I've also noticed that the blower seems to always run at 12v (pulse isn't activated) no matter what the fan percentage is set to. I'm hoping I just screwed up the atmega chip. I ordered another, but it's going to be a week or so before I get it. Guess I can build some...

You can't see it behind because its the pi zero w. When I unplug it (after powering off, I haven't hot plugged/unplugged) the LCD goes back to working as normal. I have reflowed all of the Pi headers, atmega socket pins, shift register, and LCD connections. Still the same thing. I'm pretty...

So I've been testing continuity on the PCB for awhile now, I haven't found any issues so far. All of my LCD pins are connected to what they need to be. I reinstalled the HM image on my Pi and I am now able to change my probe settings again. So now I'm back to my initial issue of not having the...

So the other side of the LCD pin header is what is soldered, not the ends that are visible, I'll solder those to be sure but I don't think it's the issue at this point, wouldn't make sense that it works without the pi. I was able to reset my config last night, and then changed and successfully...

I built a HM 4.2.4 last week and got everything running (without my probes which were ordered). I accidentally plugged my Pi ZeroW in with one header row off, so the wrong 8 pins were plugged in while the other 8 weren't plugged in at all. This fried my Pi, but the HM still functioned without...