I’m working on a RFID door lock as a side project. Here is a parts list I’ve purchased for the project thus far:
- http://www.adafruit.com/product/923 - RFID reader (5v)
- http://www.adafruit.com/products/1482 - tags to read only ID from
- http://www.radioshack.com/product/index.jsp?productId=22472146 - servo to rotate deadbolt (5v)
- http://store.arduino.cc/product/A000066 - arduino uno as the brain
The problem I’m having is I’d like to be able to power all of these devices from a single power source. My theory for the solution to this problem was to connect all of these devices in parallel and as long as I had a power source that could safely supply the amperage it would work. I’ve attached a (very) crude sketch of my theory. The numbers in the sketch are the pin numbers going to the arduino.
Needless to say this does not work (should it?). By wiring each component individually and testing them one at a time, I can read the ID’s of the tags and print them to the serial monitor, and the servo can do the sweep test provided in the examples, not at the same time.
So my question is, what am I missing ? How do I power the arduino, a servo, and the rfid reader all from a single power source ? I hope to use this information for future projects as well and I know it depends on the project but more generically
How do I power an arduino and N number of components from one supply?