acoustic-wifi-setup
Get an IoT device (with microphone) online by transmitting wifi network and password acoustically from a web app. See a demo on youtube: https://www.youtube.com/watch?v=EegFAwh7Kmk
Setup
- install minimodem on the receiver device with a command like:
$ sudo apt-get install minimodem
- clone this repo onto that device, and run the index.js file with node (Note that at this point, the node program does not actually do any wifi setup. It just receives a message and prints it to prove that the information can be transmitted acoustically.)
$ git clone git@github.com:davidflanagan/acoustic-wifi-setup.git
$ cd acoustic-wifi-setup
$ node index.js
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Visit https://davidflanagan.github.io/acoustic-wifi-setup/ in a web browser running on the transmitting device. Enter a wifi network name and password (or any strings you want to transmit), then click Transmit, and then hold the speaker of your phone up to the microphone on the receiving device. Don't talk or move the transmitter during the transmission. The default shared/config.js makes this transmit at 150baud. (That's 15 bytes per second. And there is a 20 byte overhead. So a 25 byte message would result in a 3 second audio transmission.)
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If all goes well, the receiver will print the transmitted text. Or it will print an error. If it doesn't do either, turn up the volume and try transmitting again.
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If you want to try different modem parameters, edit shared/config.js on the receiving device. Then clone this repo to a web server, make the same config.js edits and load the customized transmitter from that server. If you use an audio cable instead of a microphone and speaker, for example, you should be able to get much higher data rates.