The 12V seems stable, I checked it on the screws on the ramps. Then i also assume the connection is secure. @Dust I tried that, and indeed there is only 3V output in this case. Thank you all for the information, I'll replace the arduino and keep this one for usb-only applications.by patrik_g - RAMPS Electronics
That's not the case I'm afraid, we only have 2 steppers, 1 fan and 2 endstops on the ramps itself.by patrik_g - RAMPS Electronics
Hi viktor, Thanks for your answer. The stepper drivers are currently unplugged. Is there a way to test for the other 2 issues? Thanks, Patrikby patrik_g - RAMPS Electronics
Hi all, I have the following setup with these symptoms: 1. USB connection, no external power supply: blink example works. 5V-GND reads 5V 2. External power (12V) via ramps 1.4: led blinks fast and randomly. 5V-GND reads 3V, and VIN-GND reads 12V. In setup 2, the original code we're using is also not working (running a fan, running steppers, etc... ) What can cause this behaviour? And can I tby patrik_g - RAMPS Electronics
Thank you for the answers. In our setup, cutting the usb was the least intrusive, and seems to work wellby patrik_g - RAMPS Electronics
Hello, I have an Arduino mega board with a reprap 1.4. The reprap is powered by a Lascar Electronics PSU 130, 12V. The Arduino is connected with USB. When I upload some software to the Arduino, disconnect USB and power on the PSU, all works as expected (the steppers move, and the PSU reports 12V). When I leave the USB connected, the steppers just make some noise, and the PSU reports 6V. Our setuby patrik_g - RAMPS Electronics
OK, thank you!by patrik_g - RAMPS Electronics
Hello, I would like to verify something before I modify our reprap board. I have a pre-assembled reprap 1.4 (with power source) and an arduino mega (with USB connected constantly). Is it required to remove the D1 diode, as there are now 2 power sources for the arduino? And if yes, can I disable it without cutting out the diode?by patrik_g - RAMPS Electronics