4/2/2024 0 Comments Arduino mega 3d printer pinoutWhen you get an over-voltage situation on semiconductors they very often turn into short circuit as the silicon breaks down. Circuits do strange things, and currents may increase, voltages may increase or decrease depending on the circuit. Cross-component - This is where a component effectively gets removed from a circuit and replaced by a piece of wire.Components blow and melt - as a result fuses may also blow if components end up as short circuits themselves. Power -> Power - This is where two different voltage power rails connect together, and high voltages get injected into low voltage components.Power -> GND - This is where a power rail connects direct to ground and massive currents ensue.There are different types of "short circuit". Well, the original description was "a current spike", which certainly does sound like one description of a short circuit. The USB polyfuse is there to protect against short-circuits, not overvoltage. This is in line with a (working Arduino Uno) which hasĭo you know if a not working LDO would still give this voltage drop?Īnd indeed, had I not been there, things might have been worse! Makes me wonder which precautions I have to take to not burn my home when I build a 3D printer! Any suggestions for extra layers of protection are welcome! I checked the voltage over the LDO 5V regulator, and it gives: As I'm more kind-a software guy, I'm not really used to fiddle with electronics, so I'm learning every day Hi! Thanks for the advice! I read about that potential solution somewhere. Note: It was just chance that I caught it fast enough that only the regulator fried. In my case, I had used a bad reference document. The way to avoid it is to be super careful. I un soldered the LDO 5V regulator and replaced it with a new one. I suffered a similar issue while building my 3d Printer (wired up the Endstop sensor board wrong) and created a short. I hope to be able to avoid disaster as this happening again! I think it's possible to fix it, but I'll wait and see. My laptop now is at a shop for inspection. In your opinion, did the USB interface break? ![]() I understand that there is no way to repair the Arduino Mega.How to protect the USB interface from any short circuit/high current?.How can I avoid the high currents through the system at startup (if this is the root cause)? Can I further isolate the motors?.How can I avoid such a scenario from happening again? A normal printer would also be connected to the laptop through USB and does not result in a current spike up to the laptop?.The grounding of the laptop was probably better than that of the power supply.Switching would result in high currents throughout the system.Small wires on breadboard connecting the high current power supply with the RAMPS & motor (Nema 17).Hinsight, this might not have been the smartest setup: After inspection, I found that a wire just after the switch had burnt through, but should not have caused a short circuit (was not grounded nor in connection with other conducting surface).Īdditionally, I was not able to reprogram the RAMPS 1.4, as the arduino board seemed to have lost USB connection functionality. BTW: the laptop was grounded through its power supply. I switched on and off the supply to the RAMPS numerous times to change things on the boards, until the moment that a short (?) generated that much current that a jumper burnt through, and my laptop switched off, not to be revived. I use a 12V, 5A power supply, which was connected through a breadboard and a switch to the RAMPS 1.4. Every time I wanted to do something with the board (eg replace the motor driver), I would disconnect the power from the board. To program my arduino, I connect it through USB to my laptop. In attachment you find a small schematic overview of the setup. It might some time help another poor soul ![]() Expandable to control other accessories.Hey! Maybe some extra info about what actually happened. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |