Wiring the Roaster

Well I had a total brain fart with the thermocouple wire between the roaster and the controller. I installed a two conductor wire thinking that thermocouples only have two wires. However, the MAX6675 chip that converts the analog TC signal to digital signal needs five wires. So I replaced the two conductor wire with a CAT5 cable that I had. Since it is just 5 volt signal going over the wire, the small wire size shouldn't be a problem. One nice thing about this is that I now have extra wires if I want to mount a second TC. I could have an air temp TC and a bean temp TC.

The MAX6675 board and the TC are mounted into the roaster.

Here you can see the thermocouple in the roasting chamber.

The small 5 volt wires were soldered and then topped with wire nuts. It was a bit of a trick to get it all wired and slid together.

I will run it through some tests today and make sure that everything is working. Then I can put the finishing touches on the roaster. As a side note, here is the color coding for the 5 volt wires.

Ground = Blue = -5vdc

VCC = Orange = +5vdc

DO = Green = Arduino Pin 4

CS = Brown/White = Arduino Pin 5

CLK = Brown = Arduino Pin 6