I have a small circuit from a toy sword that has an LED and a small speaker. It was powered by a couple of small coin cells.
I am trying to figure out how to connect it to my Arduino so I can trigger it. If I attached the circuit directly to the GND and +3.3V and press the switch in it I get the sound of a sword and flashing LED as desired.
Now I want to somehow get the Arduino to trigger the circuit but am very new to Arduino and quite unsure of how to approach this.
Can anyone advise how best to work with an existing low power circuit that can use the Arduino's power rails but needs the switch integrated?
Sorry for the noob question.