3 ms·

I eventually switched to an ESP32 and added temperature graphing: https://imgur.com/a/VM7nD74 https://imgur.com/a/VM7nD74 IIRC, I used an RTD that I had left o

I eventually switched to an ESP32 and added temperature graphing: https://imgur.com/a/VM7nD74 https://imgur.com/a/VM7nD74 IIRC, I used an RTD that I had left over from a 3D printer upgrade, but an 18B20 would fine as well. A 10K NTC resistor might even be good enough. For what I needed (and I think for what you need), just fixing the sensor to the outside of the pipe [if metal] will give you a usable signal. That sensor was just metal HVAC taped to the front cast iron door of the burner chamber. But a dead-simple timer solution gets you pretty far as you know.

progbits 3y ago
The pipes are insulated and I didn't want to cut into that, but maybe a small hole for a sensor wouldn't be too bad. But as you say, timer works good enough and that means little motivation to continue to work on it -- countless other projects await :) BTW I've also tuned the timer to run for longer in the morning to get a hot shower ready. Edit: nice dashboard, what are you using for the chart? I like the vintage look.
- sokoloff 3y ago
  That is another somewhat hacky thing. I have a mix of shame and pride that the chart (everything in the rectangle) is entirely hand-coded SVG elements emitted by the ESP web request handler.