DIY Arduino Battery Spot Welder PCB Set V3.2


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SKU: sw-pcb-v3 Category:


This is the new V3.2 PCB Set. (compatible with software V3.2.1)


What you get:

  • The two PCBs needed to build your own spot welder
  • 8 M3 nylon washers

This is the pcb only set. No other components included.


Improvements in the V3.2:

  • the Arduino Board was updated so it is now possible to mount a 3.5mm screw terminal to the input pads.
  • the voltage measurement now connects directly to the 12V input pad instead of behind the schottky diode. This guarantuees a more precise voltage measurement.
  • the 8 small SMAJ13A-13-F TVS diodes have been removed from the mosfet board. There is now one of these diodes on the Arduino board that protects all mosfet gates at once.

Improvements in the V3.1:

  • possibility to solder 4 SMD TVS diodes in parallell on the Mosfet PCB
  • enough space to solder 4 through hole TVS diodes instead of SMD diodes if no SMD diodes available
  • with 4 diodes installed possible to use with car batteries up to 800CCA

Improvements in the V3:

  • Mosfet PCB now with 2oz copper layer and wider traces which connect the high current carrying mosfet legs to the u-shaped aluminum part
  • “AutoPulse” feature, which automatically activates a pulse after a defined delay time when both welding tips touch the nickel strip (thanks to Petr Zverina for the idea)
  • 7 segment display replaced by OLED display
  • potentiometer replaced by rotary encoder
  • Menu system to easy adjust the low battery alarm, AutoPulse delay and short pulse time
  • powered directly by car battery, no more need for extra power supply
  • TVS diode integrated on the mosfet pcb, no external diodes necessary
  • upgraded Mosfets to IRFB7430 (they can handle up to 1000A welding current with no problem)
  • Standby feature: after 5 minutes of inactivity the Spot Welder will go to standby and the foot switch and AutoPulse will be deactivated while in standby.
  • u-shaped aluminum parts is now riveted to the pcb


How to built it:

  • All pcb files, part list, Arduino code… can be found at my Github page.
  • A detailed bulit guide can be found at the instructables and in the (video coming soon)

Additional information

Weight 19 g
Dimensions 60 x 51 x 1.5 mm


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