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A short tutorial on controlling DC brushed motors using ATMEL ATtiny Microcontroller and L293D motor control chip.
Here ATtiny2313 Development board is controlling 4 DC 5V motors using two L293D chips on the Board.
You can find the full Tutorial hereÂ
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We frequently use breadboard adapters for all the Atmega microcontrollers we're using and all adapters have 6-pin ISP headers. Unfortunately our programmer (AVRISP mkII) expects the target to be powered by an external source. To avoid needing a power supply when tinkering we decided to mod the programmer to provide 5V power via the USB port.
The mod simply consists of one soldered wire; from the USB pin 1 (VCC) to the backside of the pcb; pin 2 on the 6-pin ISP header. The wire runs via a switch that allows us to use the programmer with already powered boards as well.
It could be considered a bit crude but it gets the job done for prototyping. Future improvements could be adding 3.3V power and proper regulators and perhaps a polyfuse of it's own.
Have a bunch of ATTiny but no AVR/ISP programmer around?
The Arduino IDE includes a sketch called ArduinoISP. Start by burning ArduinoISP to your Arduino. After the Arduino has reset, select Tools > Board > Attiny85 and then Tools > Programmer > Arduino as ISP.  Just wire RESET, SCK, MISO and MOSI to each respective pin and then put a capacitor (10uF) between Arduino reset and ground.
To test that all pins of the chip work fine we wired PB0-PB4 to five LEDs and wrote a small running lights program for verification.
