To start with, I had a circuit which was powered by the 5v supplied by the Arduino. Rearranging the circuit, I chose to dismantle an LED torch to utilise 3 of its components (the cell casing which held 3 x 1.5v batteries, the switch and the LED) creating a larger circuit, that had it own light, and was is completely battery powered.
Splitting the voltage between two compnents, I was concerned that neither would have enough power to work correctly. When I initially set up the circuit, I decided to use a resistor with the LED because I didn’t know if it was going to be safe without one. Upon testing, I realised that the LED was not working at full brightness but the motor was at full speed. This indicated to me that the resistor I put in was unnecessary, and was further proven by my discovery of an existing resistor at the switch.
When the motor first powers up, the light does dim for a split second. I believe this will be due to the initial acceleration from rest and the extra power that the motor requires to do this. That aside, the circuit works well and I am ready to implement this with the rest of my mechanism.