Digital Password Lock is an electronics lock that uses microcontroller 8051 family to process all inputs. After all arithmetic and logic operations on inputs, it gives its output. In this lock, password is set by programming microcontroller. And this password is save in ROM of microcontroller. Password is entering by press keypad, processor checks all these inputs and verified with saved password. If password is match, it will open/close the lock. Length of password can be increase as long required.
Block Diagram :
Circuit diagram :
CPU: Central processing unit is the brain of AUTO MODE METRO TRAIN. It processes all inputs and gives corresponding outputs.
KEYPAD: Keypad is use to input password (0-9 digit) into microcontroller. Three switches are uses for function switches.
SEVEN SEGMENT: Seven-segment display is use to show inputted digits from keypad.
OPEN/CLOSE SWITCHES: NPN transistor is use to opening and closing of lock.
1. It uses low cost microcontroller.
2. very simple to use.
3. long length password.
4. low power consumption.
In future, security system can be in-built with this lock like: