The project uses an Atmel ATtiny85 AVR microcontroller and a coil to build an RFID tag. The project uses an Atmel ATtiny85 AVR microcontroller and a coil to build an RFID tag. The AVR is being powered ...

Over at SpriteMods, [sprite_tm] realized that a microcontroller could be used as a boost converter to power itself. A boost converter steps up voltage from a battery by switching the output of a coil.

[pc486] sent in his hack that uses an ATtiny85 to act like an EM4102, a chip used for RFID tags. Minimally, all that is needed is the AVR and a coil, but he recommends some filtering capacitors.

The project is designed to create a good AVR boost converter that can be used to step up voltage from a battery by simply switching the output of a coil. During the operation, the current goes and ...