Hi Guys and Gals,
Well, the header says it all, I’ve built a 3D printer using a RAMPS 1.4 and Arduino Mega setup and it’s been working great. Recently I’ve wanted to be able to disconnect it from USB but I’m finding that nothing happens when I try and use any other power source.
From what I understand the RAMPS board should power the Arduino via the Vin pin, which does have 12V on it but nothing powers up, not even the ON led, zero! I’ve also tried removing the RAMPS shield and plugging 12V into the power jack and switching on but again, still bupkis! The only time anything comes to life is when the USB cable is plugged in, and as soon as it’s removed the whole system instantly switches off even though the 12V supply to the RAMPS or the jack is still on.
What am I missing???