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Its been a while since I've looked at the build.
Are you using a nano?
To start, have you tried the v4a-test-DHT22, its on the github link from post #80. That will just test the DHT22 - on pin 2. Don't worry about connecting the DS18B20 sensors or the heater mosfets. This will print the data via the serial monitor on your computer (rather than the OLED display).
When you get that sorted I can help you out with a single channel version - its a minor change.
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