Suppose we had an analog light sensor that output a varying voltage between 0-5V depending on...

Transcribed Image Text:

Suppose we had an analog light sensor that output a varying voltage between 0-5V depending on the intensity of the light hitting it (0-dark, 5- bright). If we wanted to use this sensor to turn on a LED at dusk (suppose the output of the sensor is 1V at dusk), how could we use a comparator/op- amp to turn the LED on/off (suppose the LED requires 10V to light up, and OV to turn off)? How would we make the above circuit adjustable? (we want to be able to control the darkness level at which the LED turns on) Suppose the light sensor outputs a very "noisy" signal (i.e. the signal fluctuates by 0.5V due to external influences. How and why can we use comparators with hysteresis to prevent the LED from flickering? Explain clearly and thoroughly. Suppose we had an analog light sensor that output a varying voltage between 0-5V depending on the intensity of the light hitting it (0-dark, 5- bright). If we wanted to use this sensor to turn on a LED at dusk (suppose the output of the sensor is 1V at dusk), how could we use a comparator/op- amp to turn the LED on/off (suppose the LED requires 10V to light up, and OV to turn off)? How would we make the above circuit adjustable? (we want to be able to control the darkness level at which the LED turns on) Suppose the light sensor outputs a very "noisy" signal (i.e. the signal fluctuates by 0.5V due to external influences. How and why can we use comparators with hysteresis to prevent the LED from flickering? Explain clearly and thoroughly.

Answer rating: 100% (QA)

To create an adjustable circuit that turns on an LED based on a voltage level from an analog light sensor we can employ a comparator with a variable r... View the full answer