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UniSolder - The universal soldering controller License CC-BY-4.0

Control almost any low voltage soldering instrument

Windows Unisolder application Unisolder firmware

My intention was to build the most universal soldering controller I can think of. It can drive any low voltage (upto 24V) iron with thermocouple or resistive sensor, in series with the heater, or separate.

A short list of features:

  • power: 12-24V, AC or DC (24V 6A toroidal transformer is the best possible power source)
  • automatic 1/2, 1/4 and 1/8 power selection, so only simple single winding 24V transformer can drive all the instruments, from the smallest JBC Nano, to the largest JBC C245.
  • 2 separate heater control channels
  • 2 independent sensor inputs
  • current source on any sensor input 3uA - 12mA, with 2 bands (x1, x16) and 256 steps per band
  • flexible differential amplifier input selection
  • amplifier gain from 0 to 750 in 256 steps
  • negative offset selection in 1024 steps
  • resistive instrument identification (upto 625 different instruments can be identified by 2 resistors in the connector)
  • polynomial floating point voltage/resistance to temperature calculation
  • wave shaping to filter out the inductive peaks from series sensor signal
  • PID control with power limit
  • isolated USB port for firmware updates and live data
  • 128x64 OLED display with rich user interface.

Tested so far with:

  • HAKKO T12/T15 (series TC)
  • HAKKO FX8801 (PTC)
  • PACE TD100 (series TC, the controller also uses the cold junction sensor in the iron's handle)
  • PACE TD200 (series TC, the controller also uses the cold junction sensor in the iron's handle)
  • JBC C245 (series or separate TC, depends on connection)
  • JBC C210 (series TC)
  • JBC Microtweezers (PA120/AN120, 2 separate heaters, each with series TC)
  • JBC C105/C115 (series TC)
  • JBC Nanotweezers (NP115/AN115/NP105/NP105-B, 2 separate heaters, each with series TC)
  • WELLER WSP80 (PTC) (This iron was sent to me by a reader of the thread for a previous version of the controller. Thanks, Jaroslaw)
  • WELLER WMRT (2 separate heaters, each with separate TC)
  • ERSA RT80 (series PTC/heater resistance)
  • ATTEN GT-N100 hot tweezers (2 separate heaters, each with series TC)
  • various chinese cheap irons with separate TC

Some movies:

Additional resources

The calibration procedure

  • Connect a resistor with well known resistance (0.1%) of around 10ohm between SENSEA and Vout1-
  • Go to "CALIBRATION" submenu
  • Adjust the calibration trimmer until you get value of "R" as close as possible to the resistance of the resistor, multiplied by 100 (1000 for 10ohm resistor).
  • Optionally, press and hold center button for 3+ seconds an release it - the "currect" parameter should now show "1 128" instead of "0 128" it was showing so far
  • Connect the same resistor to SENSEB and Vout1-. The Value of "R" should be da same or very close to value shown 2 steps above. If there is a significant difference, there is a problem either with current sources or 0.1% resistors they must be made with.

My connection layout and the calibration connection in real world:


Connections to different tips/irons:

1. HAKKO T12:

  • Outer shell, and heater negative (middle) terminal connected together to Vout1- and EARTH
  • heater positive (bottom terminal) connected to Vout1+ and SENSEA
  • 1k resistor between ID and Vout1-
  • 5.6k resistor between ID and Vout2-

2. HAKKO FX8801, HAKKO 907 (original, with PTC sensor):

  • Outer shell, PTC negative and heater negative connected to EARTH, Vout1- and SENSEB
  • Heater positive connected to Vout1+
  • PTC positive connected to SENSEA
  • 1k between ID and Vout1-
  • 820ohm between ID and Vout2-

3. JBC C245:

  • Outer shell (green wire) connected to EARTH and SENSEB
  • Heater positive(red wire) connected to Vout1- and SENSEA
  • Heater negative(blue wire) connected to Vout1+
  • 150ohm between ID and Vout1-
  • 5.6k between ID and Vout2-

4. JBC C210:

  • Outer shell (green wire) connected to EARTH and SENSEB
  • Heater negative (middle terminal, blue wire) connected to Vout1-
  • Heater positive (smaller terminal, red wire) connected to Vout1+ and SENSEA
  • 3.0k between ID and Vout1-
  • 5.6k between ID and Vout2-

5. JBC C105/C115:

  • Outer shell (green wire), connected to EARTH
  • Heater negative (blue wire), connected to Vout1-
  • Heater positive (red wire), connected to Vout1+ and SENSEA
  • 3.0k between ID and Vout1-
  • 1.0k between ID and Vout2-

6. JBC Microtweezers (PA120/AN120):

  • There are 2 diodes in the original handle - they must be removed or shorted
  • Outer shell of both tips (green wire) connected to EARTH
  • Heater 1 negative (blue wire) connected to Vout1-
  • Heater 1 positive (red wire) connected to Vout1+ and SENSEA
  • Heater 2 negative (brown wire) connected to Vout2-
  • Heater 2 positive (yellow wire) connected to Vout2+ and SENSEB
  • 1.0k between ID and Vout1-

7. JBC Nanotweezers (NP115/AN115/NP105/NP105-B):

  • There are 2 diodes in the instrument - they must be removed or shorted
  • Outer shell of both tips (green wire) connected to EARTH
  • Heater 1 negative (blue wire) connected to Vout1-
  • Heater 1 positive (red wire) connected to Vout1+ and SENSEA
  • Heater 2 negative (brown wire) connected to Vout2-
  • Heater 2 positive (yellow wire) connected to Vout2+ and SENSEB
  • 1.5k between ID and Vout1-

8. WELLER WSP80:

  • Outer shell, PTC negative and heater negative (white, black and brown wires) connected to EARTH, Vout1- and SENSEB
  • Heater positive (blue wire) connected to Vout1+
  • PTC positive (red wire) connected to SENSEA
  • 120ohm between ID and Vout1-
  • 5.6k between ID and Vout2-

9. ERSA RT80:

  • Outer shell and Heater/PTC negative (pink and white wires) connected to EARTH, Vout1- and SENSEB
  • Heater/PTC positive (black wire) connected to Vout1+ and SENSEA
  • 300ohm between ID and Vout1-
  • 110ohm between ID and Vout2-

10. ATTEN GT-N100:

  • Outer shell of both tips (black wire) connected to EARTH
  • Vout1- and Vout2- connected to each other
  • Heater 1 negative (white wire) connected to Vout1-/Vout2-
  • Heater 1 positive (blue wire) connected to Vout1+ and SENSEA
  • Heater 2 negative (brown wire) connected to Vout1-/Vout2-
  • Heater 2 positive (red wire) connected to Vout2+ and SENSEB
  • 200 ohm between ID and Vout1-/Vout2-

Building instructions

How to build & load the firmware on Windows

  • Download MPLAB X IDE 4.20 (IDE)
  • Download & install XC32 v2.50 (compiler)
  • Download & install pic32 legacy peripheral libraries in C:\Program Files\Microchip\xc32\v2.50
  • Check instructions at https://github.com/cv007/XC3216/blob/master/xc32xc16-info.txt for specs file (if needed)
  • Open project from IDE
  • Build / Build Project
  • Load the produced HEX file using the Windows Unisolder application

How to build Windows tools on Windows

  • Install Visual Studio 2022 Community Edition with Desktop .net application workload
  • Open Solution file in /software/PC
  • Build All
  • Run UniSolder project

Using github actions

  • Fork the repository
  • Go to Actions, run manually the workflows and download the produced artifacts