Skip to main content

4 Channel Audio Switcher

Overview

The purpose of this project was as a test to see if the 4051 mux would be usable in audio switching. I've been designing a programmable guitar pedal switcher and used this as a test project to see if there were any fatal issues with using them for this purpose. I also had some attiny85s around and hadn't found a project for them. Being able to use two pins to control the select lines of 3 muxes was a perfect use case.

In a future iteration I'll try the 4052 mux, the only reason I didn't use one this time is because I didn't have any, and I have heaps of 4051s lying around.


Bill of Materials
  • Attiny85
  • 3 x 4051 Multiplexers
  • 2 x Momentary buttons
  • 4 x Leds
  • 5 x Stereo sockets
  • 1 x 7805 Voltage regulator
  • 2 x 10uF electrolytic capacitors
  • 3 x 1k resistors

Code

The code for this is pretty basic, and self explanatory, with the attiny only using 2 inputs and 2 outputs. Each of the buttons either increments or decrements the current channel. Since the switcher only has 4 channels, only the first 2 select lines are used, with the third select line tied to ground. All 3 4051s use the same select lines.

Using enum classes in this context is a bit overkill, but I've been trying to use as much c++ stuff as possible recently to get more comfortable with it.

I take advantage of the fact that the leds are powered through the common line on the multiplexer to use only one current limiting resistor for all of the leds.

Schematic




Labels:

Popular posts from this blog

Ableton transport control

Overview The goal of this project for me is to learn more about midi protocol, and venture into ableton live remote midi scripts. This is a basic transport controller for ableton live, but it can be used for any DAW if you manually map the controls to the CC numbers sent by the arduino. The downside of using the arduino nano is that it uses a usb to serial chip to be able to program the atmega328p. As a result of this it requires the use of a serial to midi bridge to be able to communicate with midi devices. I used Hairless MIDI < - > Serial bridge to do this, which can be found here  https://projectgus.github.io/hairless-midiserial/ . If using windows you will also need some sort of virtual midi port to be able to route the midi messages to ableton, the one I use can be found here  http://www.tobias-erichsen.de/software/loopmidi.html . I only use windows so I'm not sure what needs to be done for mac or linux. The next version I work on will use atmega328u4 wh...
Read more

Bluetooth Power Strip

Overview The reasoning for starting this project was two-fold, firstly, its cool being able to turn your lights on and off with your phone. Secondly, I wanted to have an excuse to learn how to make mobile apps for controlling electronics projects. This post will just cover the hardware aspects, and use an already available Android Bluetooth serial app. The creation of a specific app will be covered in a future post once it is done. This was the app I used for getting everything up and running.  https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal&hl=en_NZ&gl=US Electronics The electronics for this project are extremely simple, they just consist of an Arduino nano, an HC-06 Bluetooth module, and a 4 channel relay module. Four bare power outlets with screw terminals are also required to actually plug stuff in, although depending on your application you could just wire whatever device you want to control directly to the relay.  The HC-06 m...
Post a Comment
Read more