B
BlackMamba
Guest
Project by joboo
Source here
Design was taken from ://www.serasidis.gr/circuits/safety_lock/safety_lock.htm. More interesting ideas can be found there.
Lock is based on the Attiny26 microcontroller and a few external elements. Its simplicity allows to mount it on a breadboard.
Phonecard with chip has individual, siu generis number, which can be used as a key.
In the microcontroller eeprom up to eight cards can be stored.
After inserting card In the socket and pressing SW2 button a car dis registered chich is signalled with a Green LED.
Pressing SW3 deletes the card from memory, which is signaled with red LED.
When a socket is empty and SW3 will be pressed for about 3 seconds a whole eeprom wil be cleared, which is signaled by a blinking green LED.