I had this cool idea for a prank at the office, a device that generate sound every 6 minutes. This device generates 4 different sounds at 6 minute intervals. The idea is that the sounds are short, familiar, difficult to find and infrequent enough to prevent a hunt for the offending noise. This device has been done before and obviously much more professionally by others but it’s fun to make since all you need is 2 caps, a 10f200, a speaker and a battery.
The device itself is dead simple, simply find an old speaker you never use, preferably a small one so that you can drive it from the output pin. Using a small battery like I have there, you could probably let the device run for about 30 days. Here’s the design:
dead simple, once again. Only one output is used on this device, I even disabled MCLR so that there is no extra resistor. Just one cap for decoupling and one cap for producing a larger waveform for the speaker. You can change the cap size if you want, you may want a larger cap for a bit of a smoother wave. So, here’s the pinout and the source code and .hex file
- GP0,1,3 -> Not connected
- GP2 (pin 3) -> to speaker
Source and hex: 10f200 annoyo src.zip
Anyways, a couple of notes. This program was written with Oshonsoft basic. Also, it could have been written a bit smaller if I tried but as it stands it takes up 253 of 255 bytes available in flash. 🙂
Hope somebody has fun with this!