Fritzing

A toy that simply beeps randomly.  Hide it and drive someone nuts!

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This is a simple project that is easily built on a half breadboard.  I did the programming with a cheap USBasp programmer ordered from aliexpress.  There are several guides on the internet describing how to program the ATTiny85 with a USBasp programmer, just do a google search on usbasp attiny85.  My tool chain includes gedit and avrdude.  I learned most of what I needed to know to set this up in "Make: AVR Programming" by Elliott Williams (mostly chapter 2). That book focuses on the ATMega328P (the same chip used on the Arduino), but is easily adapted to use the ATTiny85.  I highly recommend that book if you're ready to take the next step; from programming in the Arduino environment into programming micro controllers directly.

 

Parts List

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ATTiny85

Piezo buzzer, passive

9v battery

9v battery snap

terminal block

5V voltage regulator

1uf capacitor

100uf capacitor

LED, red

LED, yellow

NPN transistor

push button switch

2 330ohm resistors

wire

half breadboard

usbasp programmer

 

 

The simple program and makefile are attached.