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Attention!!!

This circuit its only a reader its not programmer. You CANNOT refill, hack or any illegal thing, the telecards. The purpose of this circuit its to understans how a microcontroller read, se-ri-@l, the telecard, to build some other circuits like "electronic safety lock", "Checker for how much units left in the card" etc.

Introduction:

This reader can read the contained memory of the telecard. This cards have 64 bytes ( 512 bits) of eeprom memory that the first 8 bytes ( 64 bits ) is write protected, its only for reading.

This circuit does not include any lcd display, to keep the cost low, but the data can be viewed to any PC system using the RS232 port, by the Hyper terminal software.

The circuit:

The circuit based on AT90S2313 AVR microcontroller from atmel, programmed with telecard.hex and telecard.eep . The converter from + - 12V of RS232 to TTL and from TTL to + - 12V is MAX232. When you build the circuit ( i think its very simple ), connect the reader with RS232 port of the PC, run the Hyper terminal software ( start � programs - accessories � communications � Hyper terminal ) and set the baud rate to 19200 bps 8 none 1.

Power on the reader, insert the telecard and press the switch to read the contain of the card.

If you use a telecard base, usually this base its include a switch that is pressed when you insert the card. You can use this switch, to make the reading of the card, automatic

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