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Welcome to the merkur-avr-alfa-robi wiki!
This is alternative Firmware for the Merkur Alfa Robot (www.merkurtoys.cz)
I added some new features to the original [http://www.merkurtoys.cz/en/products/robotic-tracer Merkur] firmware, such as variable speed control for both motors also both directions. This is done by software PWM found at http://www.mikrocontroller.net/topic/114624 . As it is now, when you turn on the Robot it beeps four time at different frequencies. When you press forward the speed of the motors increase. By pressing backward, it decrease. Pressing Function 2 button it stops. The original stuff is still in the code, however the dip switches don't have any function.
The Ucontroller used in Merkur AVR Alfa, is an [http://www.atmel.com/Images/Atmel-8159-8-bit-AVR-microcontroller-ATmega8A_datasheet.pdf AVR Mega8a]. Motor Drivers are [http://www.toshiba.com/taec/components2/Datasheet_Sync/261/3604.pdf Toshiba TA7291S].