This project was made to control a led brightness which is connected to 8051 microcontroller.

The main challenge is that 8051 microcontroller unlike modern microcontroller doesn't have any analog output pins.

By using assembly language and making use of external interrupts a PMW (Pulse Wedth Modulation ) was made to change the output voltage by changing the ratio of the time at which the led is on or off. 8 levels was made while displaying the current level value on a common anode 7-segment.

All the buttons and leds are connected with pull up resistors.
7-segment is common anode.
DPTR regester is used to jump to the level function.