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ATtiny13 – two tone alarm

This is a simple and easy to build two-tone alarm that uses ATtiny13 to produce sound effects. Note that with little modifications the project can be easily utilized for many applications, in circuits where a double tone alarm may be required. Project’s code has been designed to make possible extend a list of two-tone sound … Read more

ATtiny13 – tone generator

There is a set of projects that require some kind of audio output. For example a simple alarm bell. This project shows how we can produce different kinds of audio effects by just using an AVR MCU and a speaker/buzzer.  We will use 8-bit Timer, PWM technique and some pre-calculations to generate right sounds. Tu … Read more