Firefly – an annoying little thing

Firefly – an annoying little thing

Here’s a tiny pcb that produces an annoying sound using a piezo buzzer and a ATtiny13 microcontroller.

It uses an LED, piezo buzzer, ATTINY13 Atmel microcontroller, a very small amount of Arduino code, and a coin cell battery that should last about a week.

Battery life could be improved, with longer sleep times. The device has but one function: sleep, then wake up periodically and blink and chirp, then go back to sleep.

Firefly – an annoying little thing – [Link]

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About mixos

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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