Best posts made by Daniel Wright

@Boken-Lin I have looked at the page you have linked to, but it doesn't have what I was looking for. It basically tells you the basics of programming for the expansions. There are no usable examples for the servo dock.

The examples I wanted to use from the GitHub page actually have usable examples of positioning a servo. That's what I have been looking for. The other examples just tell how to set frequency, duty cycle, etc. I can do that from the app on the omega screen. That is only good for running an led or a motor or something.

I was looking for an example that actually showed me how to move a servo to a specific position or use a joystick to move the servo. The example on GitHub looks like it shows setting servo positions but it won't run…
Thanks in advance for any help.

@Callum-Jones

This demonstration uses the ULN2003A, which is a cheaper version of the ULN2803, but is the same as far as electrical connections and such.
I wrote this in simple terms for clarity so anyone can understand it, hopefully.

In the Fritzing diagram below it shows the connections to the Onion Expansion and your external power source. This would be the same for whatever you are trying to power, wether it be an LED or a relay.
The ULN2003/ULN2803 sink the Ground to your part. So if you are trying to run LEDs or other directional power parts you have to have the Negative line(Cathode) of your part connected to the output of the chip and the positive leg of your part connected to the positive side of your power source.

When I hooked it up I just used the GPIO Tool in the Onion Console to turn on or off each color as I wanted. It worked flawlessly. My boy, only 4 years old, wanted to turn the colors on and off too.... lol

I hope this helps. Feel free to message me if you have any questions.