Hi, pls give me yr email or write to the one you see in the videoby paolo1968 - General
Have a look at this one, it works very wellby paolo1968 - General
I have a big 8A heater. Is it OK to replace F1 diode (5A) with a 11A one (similar to F2), and then simply connect the heater to D10? Of course I need to install a good heat sink for MOSFET Q1, or to replace Q1 with a one capable of handling 8A without heatsink (IRLB8743PBFor IRLB3034PBF). Of course I need a bigger power supply if I want to turn ON the heated bed too, Anything else I miss?by paolo1968 - RAMPS Electronics
Problem finally solved! No damage to the hardware, just EEPROM parameters messed up. Problem was that somehow (a bug in Marlin or an HW issue?) most of the EEPROM parameters (including the axis_steps_per_unit) got completely overwritten, most of them with 0 values. After that the printer was not able to make any moves on XYZ and E, making me to believe that digital I/Os were damaged. M502 + M5by paolo1968 - Reprappers
Unfortunately not. As I wrote above, "Replacing the Arduino board solves the issue, i.e. Ramps and stepper drivers are still working perfectly"by paolo1968 - Reprappers
It occurred to me a couple of times that I destroyed most/all of the digital I/O pins of the Arduino Mega board after running for a few seconds the Extruder motor at very high speed. Is it something we can expect/explain, or were them just coincidences? Step rate was around 50,000 step/second (STEPS_PER_UNIT=1000 steps/mm, Feedrate=50 mm/sec). Just after the incident I notices Ramps LED1 blinkinby paolo1968 - Reprappers