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Created May 18, 2016 16:55
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notes on toaster reflow oven thing
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gistfile1.txt
Thermocouple modules are based on MAX6675DS.
eBay: http://www.ebay.co.uk/itm/371409365985?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Datasheet: https://cdn-shop.adafruit.com/datasheets/MAX6675.pdf
Vcc 3.0-5.5V. Accuracy better at 3.3. Serial levels depend on Vcc.
SPI-like interface. GND, VCC, SCK, CS, SO. To read, force CS low, input clock to SCK, module outputs 16 bits of data to SO.
D15 always low (sign bit).
D14-D3 are tempurature, in 1/4degC.
D2 low normal, high if thermocouple fail open.
D1 always low (device ID).
D0 left floating?
Display module
Uses 2x 75hc595 chips to drive 4 7-segment-plus-decimal digits.
Vcc SCLK RCLK DIO GND.
https://www.sparkfun.com/datasheets/IC/SN74HC595.pdf
Vcc 2-6V
Protocol - based on https://forum.arduino.cc/index.php?topic=316731.0
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