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Parts

  • Arduino Leonardo (Uno or similar should work)

  • Heater Power Fet: PSMN1R1-30PL (1.3mohm) or similar

  • Fan Power Fet: P16NF06L or similar

  • Heatsinks: Ohmite EV-T220-38E This mounts

  • 2x XT60 connector pairs

  • 2x "JST" 2 pin (I know JST is a brand but that's how they come up on Aliexpress or Jungle site)

  • Adafruit MAX31855 Breadout Board (or similar but the mount won't line up)

  • 2 x Bar magnets that fit in a 59 x 10mm trench (I think they were imperial)

  • Top and Enclosure 3d printed

  • M3 Inserts for the arduino mount

  • 2 x 2mm self tapping screws for the MAX31855

  • 12v Powersupply (min 5 amps)

  • 50W PTC heater with fan (Jungle site)

  • SSR for the compressor

  • Thick Silicone wire for the 12v, enough to handle 5A but more for safety

schematic

Image of schematic

Notes

I soldered wires to the back of the Arduino and modules because the push wires tend to be unreliable. I can't have a device that uses high power 12v and 120v AC going on the fritz. I suggest you do the same. Means debuging is easier