I’m building a Warning Display with Bluetooth interface. The ‘Bluetooth Module’ and ‘Buzzer Control’ won’t consume much current so decided to connect them directly to the Arduino and they are working fine. But the ‘Lamp Control’ has a lot of LED’s and it needs an external power source. The ‘USB Power Supply’ I’m using is able to source the current required for the ‘Lamp Control’ (and Arduino too).
So this is my plan (see the picture) to wire the ‘Lamp Control’ and everything else.
- Green Lines are Data lines
- Red is for +5v
- Purple is for +3v3
- Black is for GND
The questions are:
- Is this OK?
- Do I need to connect an extra ground line (Dotted Line?) to the ‘Lamp Control’ for data link?
- Or what is the best option to power all these with a single ‘USB Power Supply’?
Thank you, Please help.