A free app for Android, by Peter Ho.

This app is a tutorial for the Atmel AVR microcontroller, a popular microcontroller for beginners. The tutorials are based on the ATMEGA16 C programming language. 

The best way to learn to program the Atmel AVR is to do it. If you want to learn how to program a microcontroller, there is no better place than this app. The tutorials are very easy to follow. 

There is a lot of information in the app. You can find the information on how to configure the Atmel AVR microcontroller, such as the stack size, the memory, and the serial port. You can also find the information on how to use the different commands, such as how to write a variable, how to use the loops, and how to use the functions.