I've got an L293D Motor Driver chip powered by 4.5v via some batteries and am trying to send high signals via the GPIO library in Python to control a motor, however this does not seem to work. My code is simply (pin 4 being GPIO 4 -- physical pin 7, my input pin):
import RPi.GPIO as gpio gpio.setmode(gpio.BCM) gpio.setup(4, gpio.OUT) gpio.output(4, gpio.HIGH)
Now, this works for a single LED, but doesn't when I connect a wire (as the input) from pin 2, 7, 10 or 15 (the inputs).
The chip and motors do work, as if I manually take the inputs to high/low, they turn appropriately.
I presume it is not working because of the power supply voltage differences -- the motor circuit might not recognize the lower HIGH voltage from the Pi as being HIGH...?
What can I do to make this work?