Chirpy RX

This simple Javascript application lets you record and decode data chirped out from the Sensor Watch. It's best to place a headset microphone right next to the watch, as shown in the image. Watch faces like the activity_face or chirpy_demo_face can chirp out data.

You can process a single transmission at a time. Just reload the page to process a new one. If you have trouble decoding a transmission, save the recorded audio and drop me an email at gabor.reads.this[at], or hit me up on Mastodon at

A CASIO wristwach with a headset microphone placed over it

This app runs entirely in your browser. It does not upload your audio or the decoded data anywhere. I use, a privacy-focused analytics tool to count visits.

The source code is on Github.

Audio transmission

Press to enable microphone


Processing audio...