@rgm65027, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project 
See About the Installation & Troubleshooting category.
Yes, you can power three devices from one power supply (and share the grounds).
Remember that an Arduino is not a power supply, so you basically can't power anything from the 5V or 3.3V pin.