I've also read up on getting accurate voltage reference for analog measurement with the Arduino. I figured out the sensor in the 807 is a PT50 RTD, found a resistance/temperature table for it and I've sorted out a voltage divider and op-amp circuit that should give me pretty accurate readings (☑°, way better than I need). I figured out the display pretty quickly and I'll reuse the original pot to set the temperature. Of course constructive criticism will be appreciated. Having read the 470 and 473 manuals, and a bunch of Arduino based soldering iron (starting here) and dot matrix LED interface projects, I've got most of it planned out. Besides, I've got some nice Osram DLR2416 displays, it'd be nice to put one to use here. I now know that I probably just should've bought a 47x control board compatible with the 807, but I've actually learned a bit so far and I've got the sunk cost fallacy going in full effect. At first I was going to try to adapt the 470's board but realized pretty soon it'd be easier to just build a control board from scratch based on an Arduino Nano. On another whim, figuring "how different could they be?", I bought an 807. Not having looked into it beforehand, I found it hard to find an 802 for a good price. (Actual problem in the last paragraph) On a whim I bought a working Hakko 470 for a good price.
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