Now, to measure temperature an OPAMP is needed connected to the power connectors of the tip that will detect the voltage difference created by the thermocouple. As extra parts, the board now has side buttons for the temperature set, a very small buzzer for sound notifications and a vibrations switch. This last component will be used to detect small vibrations when the iron is moved. That could be use to get out of sleep mode after the soldering iron was not used for a certain amount of time.
That's it, these are the main changes for this second version of the portable soldering iron by ELECTRONOOBS. We shoud stay tuned for next firmware update and test of this new board taht in my opinion, looks awesome.