I needed a spot welder to comfortably connect lithium cells for my other projects. So, after researching some projects found on the internet, I came up with my remix of the ones I liked the most.
The 3D model is mostly based on a similar project from Jim Conner @ https://www.youtube.com/user/ThingsWhichArentWork, but I made mine from scratch based on my transformers dimentions and some models from grabcad.com.
I've used the Nokia 5110 LCD because it is bigger than the OLED.
- double and single pulse welding modes
- saving and loading pulse times using EEPROM
- 3.5mm jack connector for the trigger switch, allowing multiple trigger options
- multiple pulse mode using on/off times and pulse quantity
- zero-crossing detector for better timing in the microcontroller
The 3D model is avalible here:
Ready to print STL files are here: