Diy Homemade Spot Welder || Arduino Spot Welder

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I wanted a spot welder to build up a lithium battery pack but since I did not found one, I made my own within 15$ excluding the batteries.
It has features that are much more expensive have like setting the pulse duration from 5ms-50ms, 1P, 2P, 3P, 4P spot welding, and a rotatory encoder for fine controls.
Users can single press rotatory encoder to weld, double press to change Parallel welding, rotate to increase/decrease the weld pulse, and long press to save the data. A red led glows so you know that the changes have been saved.
Also, it can easily weld 0.15-0.2 mm nickel strips very easily.
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