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The linkmeterd starts automatically when the Pi boots, along with the uhttpd web server, so if it boots then it works. It will serve web pages even without a HeaterMeter attached. It sounds to me like it just isn't booting up at all. What version of the Raspberry Pi is it? There are some LEDs on...

Are you sure the Pi is booting the firmware image? Can you access the webui over Ethernet? Does the wifi network you're trying to connect to appear in the scan when you go to LinkMeter -> Wifi? The "Resetting configuration" only appears on the LCD if you do the reset after the Pi is fully...

The MCP1700 variant wasn't exactly selected for this application specifically, but came from being the part I had on hand because it had lower dropout voltage. It was also a part you could find at a variety of places, which was important because the design pre-dates the ubiquity of electronics...

I was also wondering if there's an air inlet in the box somewhere because if it is sealed... where does the air it is blowing come from? Looks great as a self-contained unit though.

I am fairly confident It is not a power problem. The two are on different power supplies and my test setup has an inductor between the 5V and 3.3V supply (LC filter), a high ripple rejection 3.3V linear regulator in place of the MCP1700, a ferrite bead adjacent to the AD8495, followed by a 0.1uF...

We know it is caused by waves in the air because even when the Pi and HeaterMeter (or Adafruit breakout) are powered separately, the error still occurs. The error still exists so far away that there's no way to escape it, and the severity is related to where you hit the signal in its waveform...

I did try both with and without a wire soldered to the copper plate and the HeaterMeter ground, but not to the Pi. It made zero difference compared with not grounded. The PCB material is only 90mmx60mm so it doesn't cover the entire HeaterMeter or Pi, so maybe that would make a difference but of...

I did think of something else to try! I connected the Pi to a 5V USB power supply and the HeaterMeter to a separate 12V power supply. They were not connected to each other at all, which eliminates supply rail being involved at all. Still the same problem. I can move the two boards around and...

Check the HeaterMeter schematic again, the reference pin is grounded. :D Thursday I also tried putting a 10uF tantalum capacitor 2mm from the amplifier power input, then tried a 100uF low-ESR electrolytic capacitor. No change at all. I've now also tried the CN-0271 filter values, 100ohm, 1uF...

Yeah I was going to try the configuration they had in the application note, but the common mode filter cutoff remains exactly the same due to how the components are combined. The differential mode filter is one order of magnitude off but I don't think that's going to make any major difference...

And it should also be noted that this does not affect HeaterMeters because they do not run this operating system.

Comparison of 5GHz vs 2.4GHz impact on thermocouple noise using a shorted AD8495 (no probe, just ambient sensing) Section 1, connected to 5Ghz wifi, downloaded 150MB file in 19s. Temperature stable. Section 2, wifi scan and switch to 2.4GHz. Section 3, connected to 2.4GHz wifi, downloaded...

I've pushed a new version that includes automatic host discovery using http://heatermeter.com/devices/ (only works if both devices have internet access). Just use #define HEATERMETER_IP "" (instead of an IP) and it will try to figure it out.

The noise graph only updates every 10 seconds and is 26 milliseconds long, so it is unlikely you'll catch anything on it in client mode because it would have to overlap at the exact time you experienced the temperature jump. It is easier to see in AP mode because the Pi is transmitting like 5%...

The noise graph there looks normal and the last segment of your graph the temperatures look pretty stable too (compared to the previous two segments). Is the pit temperature bouncing around a lot even on 5GHz? It doesn't look like it would be with that graph (ignore the servo, focus strictly on...

It's been a while since I used Marlin and have never used an SKR board, but the one encouraging thing I see is that the three temperature/resistances you posted calculate out to a beta of ~3800. That's really close to the stated 3950 beta the thermistors are supposed to be, so I would guess they...

The code for the library is up on github in the arduino/libraries directory, the panel's source code is in arduino/MeterMonitor, and the scad file for the 3D printed panel is in the 3d directory and on thingiverse.

Exact same issue. You can tell it isn't related to the clock speed of the CPU because the output is perfectly flat during the boot process and the INSTANT the wifi is enabled, the noise starts. I also tried the Pi Zero W, which shows maybe 80mV dropouts instead of 100mV, so it is affected as...

It reconnects on its own if the connection drops, I have no control over it because it is in the wifi binary blob driver. I have seen it get stuck for a while before, but it usually resolves itself eventually.

The thermocouple inputs have both differential and common mode filters, common mode cutoff 159kHz, differential cutoff 7.579kHz. The datasheet recommends them because "The primary purpose of the filter is to remove RF signals, which, if allowed to reach the AD849x, can be rectified and appear as...