From the File menu choose Choose Create New Version -> Create WAV Version.

Click OK to close each dialog box and the Preferences dialog box.

In the WAV Encoder dialog box select 8.000 kHz, 8-bit, Mono:.

On the General tab in Preferences click the Import Settings.

Load the sample into your iTunes library.

Many audio editors will do this I used iTunes, as follows. Downsample the dataĪssuming your audio sample is normal quality, the first step is to downsample it to 8-bit, mono, at an 8kHz sample rate.

Here's the procedure I used to include the data in the ATtiny85 memory, starting from an audio file of the sample. Using 8-bit samples at a sampling rate of 8kHz this is enough for a one second sample. The program to output the audio samples is very small, leaving almost the full 8K of flash memory in the ATtiny85 available to store our audio sample. The circuit is about as simple as it gets: The initial motivation for this project was to provide a more interesting alert for a timer than a simple beep. I wanted to see how simple I could get the project by using the memory in the ATtiny85 itself to store a short sample. As far as I know the only other Atmel chip with this feature is the ATtiny861.Īpplications have already been published to show how to output audio from a data chip, or SD memory card, using an ATtiny85. It takes advantage of the special 64MHz clock option in the ATtiny85 which you can use to drive Timer/Counter1 for fast digital-to-analogue conversion.

It can play a one-second sample of any digitised audio using just a loudspeaker and no other components: This project describes a simple ATtiny85 application to output a short sample of digital audio through a loudspeaker.

Arduino 1.8.5 files for attiny