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https://github.com/gigabyte5671/speaker-controller

Automatically turns my desk speakers on/off when I change the audio output in Windows.
https://github.com/gigabyte5671/speaker-controller

Last synced: 25 days ago
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Automatically turns my desk speakers on/off when I change the audio output in Windows.

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# Speaker Controller

**Automatically turns my desk speakers on/off when I change the audio output in Windows.**



Well, that's what I'm using this project for anyway. Although, it's essentially just a smart power bar - you can use it to switch any household appliance on/off.







> [!WARNING]

> This project deals with dangerous mains voltages. Do not attempt to replicate this project unless you are experienced with the hazards involved and are using the appropriate safety equipment.







## Bill of Materials

Components and materials I used:

- [Duinotech Leonardo Tiny](https://www.jaycar.co.nz/leonardo-tiny-atmega32u4-main-board/p/XC4431)

- [Arduino Compatible 5V Relay](https://www.jaycar.co.nz/arduino-compatible-5v-relay/p/XC4419)

- [This random power bar](https://www.kmart.co.nz/product/arlec-4-outlet-surge-protected-powerboard-42153580/)

- [10⨯ M2.5⨯9 self-tapping screws](https://www.bunnings.co.nz/zenith-4g-x-9mm-sheet-metal-self-tappers-pan-head-slotted-phillips-drive-screws-100-pack_p2435782)

- ~20m/~60g of [1.75mm filament](https://www.bits4bots.co.nz/products/esun-pla-1-75mm-1kg?variant=43675171356827)







## Circuit

This is a rough diagram of the circuit I'm using to control the speakers:  

![full circuit diagram](./images/circuit-1.svg)



In reality, all of the discreet components are part of [this board](https://www.jaycar.co.nz/arduino-compatible-5v-relay/p/XC4419), and connected to the [Arduino](https://www.jaycar.co.nz/leonardo-tiny-atmega32u4-main-board/p/XC4431) like so:  

![simple circuit diagram](./images/circuit-2.svg)







## Code

### Arduino

Code for the Arduino is located in the [`sketch`](./sketch/) directory.  

This program simply listens for characters being sent by the USB host and toggles the relay's state accordingly. If the program receives a `'1'` the relay is turned on, `'0'` the relay is turned off. The program also needs to receive a heartbeat message (`'2'`) at least once every 5 seconds for the relay to stay on.



### PC

The script to be run on the connected PC is in the [`controller`](./controller/) directory.  

This script runs in the background, polling the registry for updates to the default audio output device. When the default device changes to one of the specified **"active"** devices, it instructs the Arduino to turn the relay **on**. When the default device changes to one of the specified **"inactive"** devices, it instructs the Arduino to turn the relay **off**.



> [!TIP]

> You can customise the list of "active" and "inactive" audio devices in the [config](./controller/config.js) file.



> [!NOTE]

> You'll need to run `cd controller && npm i` before running this script for the first time.







## Housing

The [`models`](./models/) directory contains some housing models that fit with [my particular power bar](https://www.kmart.co.nz/product/arlec-4-outlet-surge-protected-powerboard-42153580/).



You can also find the [model source on OnShape](https://cad.onshape.com/documents/b996f80e98ba7dbd92c3a90e/w/50b2495923acaf03b7d63635/e/e429f6e0665596681b5c2419?renderMode=0&uiState=6615ad4f92329a0588dcb680).



I printed these with eSun White PLA+, and the following settings:

- 0.4mm nozzle

- 0.2mm layer height

- 3 wall layers

- 15% infill density







## Images

Fully assembled:  

![The assembled device](./images/pic-1-small.jpg)



The Arduino and relay are slid into the right side of the housing:  

![Inside the right side of the device](./images/pic-5-small.jpg)



With the cover on, the USB port is accessible from this side of the device:  

![Inside the right side of the device](./images/pic-3-small.jpg)



On the opposite side, the two ends of the live wire are inserted into the screw terminals on the relay board:  

![Inside the left side of the device](./images/pic-4-small.jpg)



The terminals can be tightened down through a small hole in the top of the housing:  

![Top of the device](./images/pic-2-small.jpg)



*You can find full-size versions of these images in the [`images`](./images/) directory.*