![]() On other thing I noted (since problems with the LCD seem to be related to the amount of current the back-light draws).with the Arduino/RAMPS powered only with the USB cable the backlight is on continuously (white letters on blue background). So my understanding is that if this D1 is in place, turned the correct way around and functioning, then I should be able to operate the Smart Controller without the USB cable plugged in. Got a reading of 0.59V with the positive on the right. I powered on the Arduino/RAMPS and checked across D1 with a multimeter (couldn't run the steppers with the drivers off). It seems to be placed correctly with the band on the left end (the end of the Arduino with the USB connector) ![]() Instead I pulled the stepper drivers off to see if the D1 diode was in place.Īnd.it is. OK I chickened out on connecting the 12V to the Arduino barrel jack. does the Mosfet overheating only pertain to 5v through the Barrel-plug, or?Įdited 4 time(s). Guess I'll tune mine to 7v maybeĮdit: I know, and have read about, a lot of people, running their Ardunio Mega only through USB power, which is 5v - without any probllems. I Have read lots of warnings about using 12v on Arduino as it would overheat due to the conversion to 5v needed. what mosfet is that? - Not being sarcastic or anything, but I genuinly would like to know what mosfets? On Ramps or Arduino, and WHY would it overheat? ![]() With only 5V input the risk of overheating MOSFET is bigger.Īs I said above, mine runs fines on 5v, but I wasn't aware of any overheating of Mosfets. The regulator needs at least 7V input voltage to work properly. Then you should check if arduinos 5V regulator is working before you can even think of doing any mods to Ramps or LCD.ĭon´t feed 5V to arduinos barrel connector as proposed before. How do you connect another 5V supply directly to the Arduno? There is an unused 12V barrel connector on the Arduino but would connecting a 5V wire from the ATX work there? I don't want to try this and find I've fried my board!Ĭheck if diode D1 is there on Ramps and mounted in the right direction. So it seems that the Arduino is not supplying the required 5V to the LCD (by way of the RAMPS breakout board), even if the12V power supply to the RAMPS is operating? Disconnecting the cable results in the LCD going black and the print stopping. I can print with this arrangement using the SD card and controlling the printer fully from the LCD encoder, even without Repetier Host running on the laptop.īut it MUST be connected to the laptop with the USB cable. To operate the extruder heater and print, I need to turn on the power supply (obviously). With the USB cable attached to the laptop the LCD screen functions properly, with or without the ATX power supply turned on. I am very new to electronic hobbies so I need some of the explanations clarified (ie: dumbed down). I have been printing Repetier Host on my laptop for about 6 months but recently tried to implement the SD card method. I have exactly the same problem with my LCD controller. Large delta printer, E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerodĭisclosure: I design Duet electronics and work on RepRapFirmware. ![]() Similar considerations apply if you try to power a servo from +5V - the Arduino regulator can't cope.Įdited 1 time(s). A 180 ohm 0.5W resistor should be about right. Disconnect the LCD backlight anode from the +5V supply, and run it instead from 12V through a series resistor. Use an Arduino variant with a higher power voltage regulator, e.g. Easy enough when using an ATX PSU, but if you are using a 12V LED PSU then this means using a separate 5V regulator.Ģ. Supply the Arduino/RAMPS with a separate 5V supply. Sounds like the backlight has pushed it over the edge in your case. One of the problems with Arduino/RAMPS is that the 5V regulator on the Arduino Mega can barely provide enough additional power to drive the backlight on a LCD display.
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