Sprite

The sprite is a small interactive sound object. Tiny, very low-cost, easy to make, it can be produced in large quantities and hidden in public places. It reacts to the movements of people by emitting a strange sound, both electronic and melodic.

A 3V watch battery gives it an autonomy of a few days. It needs a bit of light to work (ie. it doesn't work in total darkness).

It can be hung with the use of a magnet, tape, etc.

Ingredients

• 1 x ATtiny
• 1 x piezzo
• 1 x photoresistor (50 kOhm)
• 1 x resistor (50 kOhm)
• 1 x black "shrink" (approx 2cm)
• 1 x watch battery 3V
• wire

Instructions

1. Copy attached files farfadet.c and Makefile.txt to your repository
2. Modify the BASE_PERIOD and SEELIE parameters in farfadet.c to give its own "personality" to the sprite
3. Compile: make
4. Configure ATtiny's fuses (lfuse: 0x72 and hfuse: 0xFD) with: make writefuse
5. Upload the program on the ATtiny: make install

See the electronic schematics in attachment.