Introduction
This experiment shows how to use the NE555 timer IC to generate a PWM signal to dim an LED. By adjusting the PWM duty cycle, the brightness of the LED can be varied.
Materials Required
- NE555 Timer IC
- LED
- Resistor
- Power Supply
- Breadboard and jumper wires
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Circuit Diagram
The NE555 timer is configured in astable mode to generate a PWM signal. The signal is used to control the LED's brightness.
Steps for the Experiment
- Assemble the NE555 timer in astable mode.
- Connect the PWM output to the LED through a current-limiting resistor.
- Adjust the duty cycle of the PWM signal using a variable resistor.
- Observe the change in LED brightness as the duty cycle is varied.
Explanation
The brightness of the LED is controlled by the duty cycle of the PWM signal. A higher duty cycle results in brighter light, while a lower duty cycle dimmes the LED.
Results and Observations
- The LED brightness should change smoothly as the PWM duty cycle is adjusted.
