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mexlefirst_public:led_brightness_control_using_pwm [2026/08/05 10:18] – feharstmexlefirst_public:led_brightness_control_using_pwm [2026/08/05 11:04] (current) – feharst
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 +<wrap #nugg-led-brightness-pwm>
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 =====LED Brightness Control using PWM===== =====LED Brightness Control using PWM=====
  
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 In the final part of the experiment, LEDs are connected to the circuit and their brightness is controlled using the generated PWM signal. By adjusting the duty cycle, the average power delivered to the LEDs changes, resulting in a corresponding change in brightness. In the final part of the experiment, LEDs are connected to the circuit and their brightness is controlled using the generated PWM signal. By adjusting the duty cycle, the average power delivered to the LEDs changes, resulting in a corresponding change in brightness.
  
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 ====Experimental Tasks==== ====Experimental Tasks====
  
 +<wrap #setup>
 To analyze how to adjust the brightness of LED-lamps, using a PWM-signal, the following circuit is used:\\  To analyze how to adjust the brightness of LED-lamps, using a PWM-signal, the following circuit is used:\\ 
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 \\  \\ 
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   - Build the circuit on the MEXLE-board. To do this, connect two LEDs in anti-parallel. What value must the series resistor for the LEDs have? **An LED requires approx. 20 mA to operate.**   - Build the circuit on the MEXLE-board. To do this, connect two LEDs in anti-parallel. What value must the series resistor for the LEDs have? **An LED requires approx. 20 mA to operate.**
   - Use the circuit variant with **C1 = 10 nF**. Vary the duty cycle and document the result.   - Use the circuit variant with **C1 = 10 nF**. Vary the duty cycle and document the result.
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   - How would the circuit have to be designed if only one LED is to be operated with brightness control?   - How would the circuit have to be designed if only one LED is to be operated with brightness control?
  
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 ====Test Questions==== ====Test Questions====
 +</wrap>