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Good day! I'm thinking if it is possible to add another band heater, MOC3020, firing pulse pin,thermocouple, and BTA16 into the circuit to have a 2 band heater setted at two different temperature and have PID controlled by arduino. What would be the new circuit and coding in arduino. Thank u in advance for replying :). It would be a great help for my study <3
in Circuit basics by (220 points)

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That's not easy to explain. The code is the same but the PID part should be doubled. The circuit the same but doubled as well with 2 different firing pins.
by (34.8k points)
Im thinking that i will put another MOC3020, and BTA16 connection in parallel to the existing  MOC3020/BTA16 (is that right?). My only concern  is the programming part.. I still doesn't understand how it works hehe.