Headphone / Speaker Motion Sensing Switch

Projects General Guidance
1

Hi all,
I'm building a "smart home" speaker stand that accepts a 1/8" audio input (ideally from a phone, etc) and depending if a motion sensor is activated or not, it plays the audio signal through the speakers (if sensor is activated) or through headphones (if sensor is not activated)

I mainly need help trying to figure out how to wire up relays and get a wiring schematic.

Thanks in advance!

2

rbk202:
Hi all,
I'm building a "smart home" speaker stand that accepts a 1/8" audio input (ideally from a phone, etc) and depending if a motion sensor is activated or not, it plays the audio signal through the speakers (if sensor is activated) or through headphones (if sensor is not activated)

I mainly need help trying to figure out how to wire up relays and get a wiring schematic.

Thanks in advance!

Do you have the Arduino and motion sensor working?

Paul

3

What do you need help with?

Typically, you'll work on the input (motion sensor) and output (relay) separately...

So for example get the motion sensor working to turn-on an LED. If you use the Arduino's built-in pin-13 LED you won't have to wire one up.

Then, you can wire the (DPDT*) relay to the speakers/headphones and test relay with a direct power connection to the relay coil (no Arduino needed).

Then wire the relay to the Arduino** and test it with the Blink Example sketch (no input required).

Then put everything together with software that reads the motion sensor and activates the relay.

  • A double throw switch (or relay) is a 3-terminal switch. It can be wired with one input (the audio signal) that can switch between two outputs (speakers or headphones). A double-pole, double-throw switch (or relay) is two of these (so you can switch stereo signals).

And a relay is an electrically-operated, and electrically-isolated switch.

** You can't directly drive a relay coil with the Arduino. You'll need a driver circuit, or you can get a relay board with a built-in driver.