1. The main component in the circuit is 8051 microcontrollers. This control everything in the device. 2. We connect the 4x3 keypad with the microcontroller. In the keypad there is 4 rows which is ...

Password Based Door Lock System is a Microprocessor based Embedded System built on using 8051 microprocessor and Embedded C-programming. This Project was done for my CSE331 ( Microprocessor ...

The 8051 is an accumulator-based design with 255 instructions. A basic instruction cycle takes 12 clocks; however, Dallas Semiconductor redesigned the instruction-execution circuitry to reduce the ...