In this shield, the thermistor connected to T0 is, in turn, connected to the board's A13 pin. I was having trouble trying to use this Mega 2560 board with a RAMPS RepRap Shield. The only thing we know for sure is that they connect to "arduino I/O pins".I have at hands an Arduino Mega 2560 board, which seems to have the standard layout of clone Mega 2560 boards that can easily be found online to buy (photos of the board here). 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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