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 The second end of the 1.5k connects to the second end of the 3.2k resistor and from.One end of the 3.2k resistor (you can use anything between 3k and 3.2k) goes to GND.I say this because if it was the other group, then you would need 4 sets, not 3, right ?
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