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In this mode the soldering iron is powered. When the controller is just powered on, the standby mode is activated. Tune mode (the initial setup procedure).Main working mode (keep the temperature).The controller has tune mode to simplify the initial setup procedure of the controller.Īs I mentioned before, the controller has several modes:.The controller supports Celcius or Farenheit units to be used for the displayed temperature value, preset temperature and calibration data.The temperature is stored in Arduino EEPROM after the soldering iron was used in case the temperature settings were changed.
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When the encoder rotated quickly, the temperature setting is changed by 5 degrees. When the encoder is rotated slowly, the temperature setting is changed by 1 degree. The controller implements accelerated rotary encoder.This allows the PWM frequency to be increased up to 31250 Hz instead of 490 Hz by built-in analogWrite() function. To keep the operation silent, the Timer1 high frequency interrupts are implemented in the controller.The controller supports two working modes: keep the temperature and keep the power supplied.The calibration procedure is automated by use of PID algorithm to keep the temperature near the reference point.Three reference temperature points implemented in the soldering iron calibration procedure.The controller keeps the temperature in case of heavy usage because the PID algorithm is very sensitive and can quickly increase the supplied power.The iron raises the temperature in about 30 seconds and keeps it inside 1 -2 degrees of Celsius. The PID algorithm is implemented to keep the temperature of the soldering iron.You should choose the appropriate schematics. The controller is suitable to work with a variety of hakko 907 handles, with thermocouple or with thermistor to check the temperature.It is better to replace the plug on the iron handle with another one, for example, aviation plug GX16-5 or GX-12-5. This controller can be used with another iron handle that has the similar architecture. The handle has two independed electrical circuits for the iron heating and temperature checking. The controller deals with the hakko 907 soldering handles with replaceable tips and has built-in heater element and thermistor OR thermocouple to check the iron temperature. UPDATED : new features are implemented (see the description) UPDATED : new hardware schematics implemented UPDATED : sketch bug fixed, sketch for lcd1602 added UPDATED schematics and description updated