How do you plan to connect that board in the fridge to your NodeMCU?I'll be using another ESP8266 equipped board to connect via WiFi.
Isn't it easier to just wire a temperature sensor that you can read directly?
Each datasheet has a section titled Instruction Set Summary.And the more complete description of what the instructions do is in Atmel-0856 AVR Instruction Set Manual
commandByte = Serial.read();//read first byte
noteByte = Serial.read();//read next byte
velocityByte = Serial.read();//read final byte
if (firstCondition == true)
if (secondCondition == true)
if (thirdCondition == true)
if the pin's not connected, it will still have random continually-changing voltages running through it,Voltages do not run, nor are they through. Voltage is across, current is through.