obsunal / diy-pid-soldering-station

Soldering Iron/Heat Gun Controller

DIY-PID-Soldering-Station

Soldering Iron/Heat Gun Controller

The goal was take a some knockoff known good brand soldering iron (JCB, Hakko, Weller...) and make an overengineered control box for it.

In the end I want to feature;

• Two devices, most likely one of them being hot air (the one where they have blower inside the station.)
• PID control with double mode agressive and laid-back configurations
• AutoTune algorithm for PID.
• Stand idle mode
• Shutdown time
• Amount of power delivered
• Has Prusa like interface (rotary encoder with couple of buttons)
• Interface featuring variable control (eg. idle temp, PID variables...)
• Can be reprogrammed somewhat easily (via bootloader and/or ICSP headder) Bonus points
• Feature selectable control methods
• Deployed multiple platforms (PIC, AVR, Xtensa-ESP32, ARM-MSP STM32)

diy-pid-soldering-station's Issues

Transistor Pins for FETs

Pins have to be changed to PB1, PB2, PB3. Not sure yet but for now, I'm thinking PB2 and PB3 for no real reason other than each of them in being different timers. Another thing to consider is PB3 is MISO that may or may not affect ICSP programming.
PS. PB2 is digital pin 10 on Arduino
PB3 is digital pin 11 on Arduino

Not enough interrupts to use an encoder

Simplify Circuit

Check if voltage divider overloads if not you can eliminate some transistors which would make the circuit simpler.
Also, refer to X-Tall issue to simplify little more.

PS. Suggest not touching capacitors around LM7805 regulator, because they are different size packages and can always leave them empty.

Shunt Resistor Placement

X-Tall

I'm not sure to include x-tall or rely on the internal capacitive oscillator. I don't know how much wear internal oscillator gets. The answer may be in datasheet gotta check it.

Power Monitoring

I don't know how I'm gonna deal with power. Since it's PID I can't just use a shunt to find amps going through.