Skip to content

yschroeder/SolderingIron

 
 

Repository files navigation

SolderingIron

Idea for an OpenSource Soldering Iron

This project is just another avr based soldering iron. Since professional equipment is quite pricy and not very complicated this projects takes a good, changeable soldering iron tip like the Weller RT1 and provides all the electronics behind that.

View on PCB Layout

Features

  • open hardware (schematic and layout made in Eagle 7.2 freeware license)
  • open firmware written in C (not ready to use right now)
  • fast heatup
  • saving and restoring temperature to and from EEPROM
  • high-precision op-amp for temperature measurement
  • safety measures against overheating and controller crashes
  • automatic temperature control (pid controller)
  • different temperature scales available (recompiling necessary)
  • solder tip rest detection via hall sensor (optional)
  • almost all parts are available from the Seeedstudio Open Parts Library

How does it work

  • 5V for logic
  • 12V for soldering iron
  • ATmega328p controlled

Temperature measure

The thermo-voltage signal is amplified by an op-amp with a gain g = 1 + R1/R2 = 1 + 51k/100 = 511 this signal is converted by ADC0 using Vcc=5V as voltage reference

Solder tip detection

Solved by a hall sensor connected to ADC2. This sensor is powered by 5V

References

Links:

Datasheets:

Current State:

  • hardware version 1.2 is almost ready to be produced
  • optimized bill of materials by reducing unnecessary components
  • PCB measures 5cm x 5cm
  • individual 7-segment displays in use (broader availability)
  • I2C is now unused and can be used for additional hardware

About

An OpenSource Soldering Iron

Resources

License

Stars

Watchers

Forks

Packages

No packages published

Languages

  • Eagle 72.5%
  • Stata 26.1%
  • C 1.2%
  • Other 0.2%