![]() The Type of extruder you purchase is up to you. The only thing we know for sure is that they connect to "arduino I/O pins".In the Laminated Prusa I3 printer the only electronic parts I added were the Nema 17 Stepper motors and the MK8 Extruder. Need the voltage divider is the ONLY group of 3 pins, which are the PWM pins 9,10 and 11.īut I can't find a schematic to prove that. I am simply reasoning that what information is available suggests that the group of 3 pins that I can't find any proof anywhere of a connection between the voltage dividers and the ULN2003. PWM pin 11 gets a voltage divider, the output of which goes to pin-3 of the ULN2003. PWM pin 10 gets a voltage divider, the output of which goes to pin-2 of the ULN2003. PWM pin 9 gets a voltage divider, the output of which goes to pin-1 of the ULN2003. Then goes to the ULN2003 pins 1,2 &3, so The purpose of the voltage dividers is to reduce the arduino 5V PWM to 3.3 volts which
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