The micro controller based digital lock presented here, its use as access control system or any other Application. The system comprises a small electronic unit with a numeric keypad, which is fixed out side the entry door to control a solanoid-oprated lock. When an authorized person enters predetermined Code number (password) via the keypad, the relay operated for a limited time to unlached the solenoid-operated lock so the door can be pushed/pulled open. At the end of preset delay, the relay reenergizes and the door gets locked again. When the code has been incorrectly entered four times in a row, the code lock will switch to alarm mode. In this state, all key presses are ignored for one minute and at the same time the buzzer will sound the alarm signal. This function thwarts any attempt by ‘hackers’ to quickly try a large number of codes in a sequence. The secret code can be changed any time after entering the current code (Master code).
SALIENT FEATURES
- Outputs - Relays
- Contact rating - 3A / 230V AC
- Operating voltage -12V AC / DC (nominal)
- Operating current - 100mA with no relays operated/500mA with relays operated (Aprox)
- Access Time (Door opening time) - 10 Second
- 3 X 4 Keypade Type
- 4 Digits Secret Code - (0 To 9)
- No require battery back up (Password Store in Internal EEPROM)
- Buzzer to annunciate a key press, error situation and Alarm
- On board power, and relay status LEDs
- Password Reset Button to Reset The Password
- Password Change LEd Indication
- 3-way screw terminals for relay contacts
- Onboard regulator for regulated supply to the kit
- Microcontroller based design for greater accuracy and control
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