Left-angle micro USB extension cable (1-foot) Only one end needs to be right angled to fit into the control pad enclosure. This will connect the audio output from the Audio FX board to the amplifier. board with or without individual copper pads are fine, though make sure that the holes are not electrically connected via metal traces! If you buy a board larger than the above size, you can score & snap it to the size you need. Any kind of perf board will do, provided that it has the standard 2.54mm (0.1") hole spacing. Buy this exact style so that they fit the 3D printed control pad properly! There is a colored cap that snap onto a yellow stalk on the button. You will use 11 of these buttons for the project. Be sure to look at the photo in this step of the Instructable to be sure you buy the same style as the one in the photo.Īdafruit Colorful Round Tactile Button Switch Assortment - 15 pack I connected two horns to mine for adequate (in my option) loudness.
This is a stereo amplifier, meaning that it can drive one or two horns. TPA3116 D2 120W+120W Dual-Channel Stereo Digital Audio Power Amplifier 12V-24V Simple sound effects will sound good, but rich music will not. Note these are PA-style horns with no bass. These speakers are weather resistant, too. I installed two horns for best overall loudness. This 15W speaker is decently loud enough for use as a car horn and small enough to fit into an engine compartment. Get the board with 16MB of memory, a 3.5mm audio jack on one end, and a micro USB connector on the other. Note there are four variations of this board. Thanks for Mark Rober's video build of his car horn that inspired my project: If you don't have a 3D printer, then you can manually build these with other means it's not rocket science. This project requires 3D printing for the control pad and amplifier enclosure. One horn has decent volume, but I installed two horns for a bit more loudness. The horns are 5" 15W PA-style horns, easy to fit into an engine compartment. This is fed into an inexpensive 120W amplifier that supports one or two horns. The Audio FX board is powered with a micro USB cable and outputs sound via a 3.5mm jack. Copy OGG audio files to it (it's easy to convert to OGG from MP3 or WAV) with a particular naming convention that will match the buttons on the control pad. There is no programming involved simply connect the board to your computer via a micro USB cable and it turns into a flash drive. The heart of the system is the Adafruit Audio FX board. The control pad is relatively small and can fit anywhere. Note: This project isn't limited to car horns! It can be added to toys, bicycles, motorcycles, kids' riding vehicles, and anything else that needs sound effects. Each press of these latter buttons will play a random sound from that category. Three of the buttons are dedicated to "favorite" sounds, while the remaining eight buttons represent sound "categories" that store 10 sounds each. This Instructable will help you build a digital horn for your car! It will play up to 83 sound effects/clip using a small control pad of 11 buttons.
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