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This is normal and caused by the "Y capacitor" that connects the primary side of the wall wart with the secondary side. It is there for EMC reasons. It should be safe enough to touch and only presents a problem if it introduces noise into your measurements.

I think the point is that you don't build the HM board, but instead build a minimal "Headless" version of it. Just enough to connect the probes and the fan/servo. I have made something similar before (well the headless part of it, not the wireless part of it).

Thanks for sharing! I got my custom PCBs, but I'm still waiting for my HLK-RM04, so I still can't test it. I'll post an update when I have it.

Oh wow, thats exactly what I have been working on. Well, I'm mostly waiting for my HLK-RM04 any my custom PCBs to arrive from China. Would you mind sharing your changes or at least your ".config" file for OpenWRT so I don't have to duplicate the work? As for RAM starvation, do you have zram...

Yeah, this isn't supposed to happen. Possibly there is a short or a bad connection somewhere on the power supply rails.

Thats strange. Did you check the voltages directly on the Heatermeter pins or on the cable?

The cable seems to be kinda long. Could you test it with a shorter one? The 1.5V could be due to the pins switching back and forth too rapidly for the multimeter to register. Does the shift register get warm? Did you measure it with the display connected? If so try measuring it without the...

I wonder if its possible to power the heatermeter using a thermoelectric generator. There is sure a lot of waste heat that could be utilized. That would probably be the ultimate cable free experience.

What version did you test it on? Maybe it works now with trunk? At least there is a patch for it. I don't have a dongle with that chip to test though.

I'm sure people will recognize its usefulness eventually, although this feature could raise some privacy concerns. I love the alarm change though! As for my experiment with the RT5350, I got a custom trunk version of OpenWRT with Linkmeter to compile to about 3.1MB. I have also laid out and...

Yeah, I'll need to strip and optimize a lot. Its a challenge. If everything else fails I'll have to upgrade the RAM to 32MB. I'd prefer the VoCore too, but having to wait until end of the year kinda sucks. If I succeed I'll give you remote access so you can test the resulting performance...

What kind of boards have you been considering for this? From what you have written I'm guessing VoCore? I'm planning to try and do something similar, except with the HLK-RM04 Those are about $9 a pop on aliexpress. 4MB Flash and 16MB RAM are going to be a really tight fit though.

You could try asking your local hackerspace. I don't know them personally, but usually hackerspaces are happy to help.

I have used a ferrite bead in series with some ferrite core toroidal inductor for L and a 10uF in parallel with 10nF for C. The inductors were some random parts from my junk box, so I don't have much details on them.

A very nice and compact board, thanks for sharing! I have not tested that module for the remote probes as I don't have a use case for remote probes yet. Your results sure look like interference on your channel. The longer the message takes to send the more likely it is to be interrupted by...

Headless and SMD, both things are very much relevant to my interests. I'd love to read more about your design.

So I had a few spare square decimeters on a PCB panel and decided to make myself a heatermeter. Unfortunately I did not have enough space to just use the vanilla heatermeter PCB, so I have designed my own stripped down version. It is similar to the vanilla heatermeter, but it is designed to...