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Raspberry Pi Coffee Roaster

Source

GPIO layout:

RaspberryPi

Sensor:

Used MAX31855 Thermocouple for temperature measurement.

Pin Sensor
1 Vin
9 Gnd
21 DO
29 CS
23 CLK

Relay:

Used SSR-25DD solid state relay with an NPN transistor and a resistor to switch the 5V.

Pin Relay
2 +
11 P

The - of the relay goes to the N side of the NPN transistor. Pin 11 goes to the P side of the NPN transistor. The other N side goes to GND (I used Pin 9) with the resistor inline.

Diagram:

ELF Wiring

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Raspberry Pi Coffee Roaster

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