Getting bored of the websites general hit counter? Would you like to spice up your life with something different?

Well, you can have it by creating a bizarre AVR ATtiny25 USB physical hit counter.

Prepare these essential components:

  • MCU
  • 8 X 7 segment display
  • AVR ATtiny25
  • MAX7219
  • 300mA, 9-12V DC/AC external power

Note: No USB Programming required in this project!

If you referred to the above circuit diagram, you will notice that the MAX7219 requires only three I/O from MCU. Christian Starkjohann has designed an outstanding USB firmware named ‘AVR-USB’. With the help of AVR-USB, we can directly implement USB interface on AVR microcontroller project, even without any USB hardware!

Some of the important matters you need to watch out:

The MAX7219 will require a 300mA, 9-12V DC/AC external power supply and this for avoid the overloading incident on USB bus.

A heat sink need to place at the regulator (IC1).

Bus-powered will be used for IC3. Hope you will enjoy this stuff. [read]

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