I recently received five of the ULN2003/28BYJ combos, as described on the below link: http://www.4tronix.co.uk/arduino/Stepper-Motors.php
I am powering the stepper controller with a 5v supply from the YwRobot breadboard power supply, which in turn is powered by a 12v wall wart. I have tried to use both the breadboard output pins and the 5v jumpers directly on the YwRobot PSU.
I am using an Arduino Nano to run the controller, and I am using digital pins 8,9,10 and 11, which are connected to cables IN1, IN2, IN3 and IN4 respectively.
Pretty much everything is stock standard as described on the 4tronix site, I am even just running their sample code, and have nothing else fancy going on.
I am not seeing any LEDs come up on the driver controller, and the motor does not turn. I have tried three of the units, and double and triple checked my wiring, but it seems for all intents and purposes that the controllers are just not getting any input.
I have tested the Arduino ports with LEDs and temperature sensors, and tested another Nano as well, to no avail.
How can I best trouble shoot the controller, or else figure out how to get these to work?