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Alternative firmware for USB powered soldering iron ZD-20U.

Results 3 zd-20u issues
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Since this device does not have lots of power it would perform poorly if you try to turn the temperature down using open loop control. eg.: it would not turn...

Hi, I really want to attempt this mod, but the big issue is my board revision is quite different from yours (mine is ZD-20U-4, while yours is ZD-20U-8). Attached are...

I'm not much into arduino, but have a chip programmer with adapters. Is the .HEX or .BIN file available?