2.An Automatic Night Light uses a photocell to detect the amount of available light in a room. Under strong light theresistance of the photocell is 1kn but goes up to 100k2 in total darkness. The photocell is put in series with a 4.7k2resistor so as to make a voltage divider when the ends are connected between +5V and GND as shown. As it gets darkerin the room, the resistance of the photocell goes up and raises the voltage on the "Sensor Voltage" line. At "dusk", thephotocell has a resistance of 10k2.Automatic Night Light5v Vdda.What will the range of the sensor voltage be as the photocell+5Vgoes from 1k2 (bright light) to 100k2 (total darkness)?Photocellb.Write the equation for VoUT expressed in terms of the op-ampSensor VoltageLM358ADVoutU1Ammarceau5Vinputs and gain. What is the maximum range for Vour?ReferenceR424.7kaVoltage (V)White LEDC.Assuming the light is to come on at "dusk", what must thePOTENTIOMETERreference voltage be set to to have the LED come on?SR3d.If the white LED has a VF of 3.0V @ 10mA, what would be asuitable value for R3?

As per our policy we can provide solution to first three questions only. As we have given : VDD=5…

2. An Automatic Night Light uses a photocell to detect the amount of available light in a room. Under strong light the resistance of the photocell is 1kn but goes up to 100k2 in total darkness. The photocell is put in series with a 4.7k2 resistor so as to make a voltage divider when the ends are connected between +5V and GND as shown. As it gets darker in the room, the resistance of the photocell goes up and raises the voltage on the "Sensor Voltage" line. At "dusk", the photocell has a resistance of 10kN. Automatic Night Light 5v vdd What will the range of the sensor voltage be the photocell а. +5V goes from 1kN (bright light) to 100k2 (total darkness)? Photocell Sensor Voltage LM358AD b. Write the equation for VoUT expressed in terms of the op-amp Vout U1A mmarceau 5V inputs and gain. What is the maximum range for VoUT? Reference Voltage (V) R4 34.7ka White LED c. Assuming the light is to come on at "dusk", what must the POTENTIOMETER reference voltage be set to to have the LED come on? SR3 d. If the white LED has a VF of 3.0V @ 10mA, what would be a suitable value for R3?

2. An Automatic Night Light uses a photocell to detect the amount of available light in a room. Under strong light the resistance of the photocell is 1kn but goes up to 100k2 in total darkness. The photocell is put in series with a 4.7k2 resistor so as to make a voltage divider when the ends are connected between +5V and GND as shown. As it gets darker in the room, the resistance of the photocell goes up and raises the voltage on the "Sensor Voltage" line. At "dusk", the photocell has a resistance of 10kN. Automatic Night Light 5v vdd What will the range of the sensor voltage be the photocell а. +5V goes from 1kN (bright light) to 100k2 (total darkness)? Photocell Sensor Voltage LM358AD b. Write the equation for VoUT expressed in terms of the op-amp Vout U1A mmarceau 5V inputs and gain. What is the maximum range for VoUT? Reference Voltage (V) R4 34.7ka White LED c. Assuming the light is to come on at "dusk", what must the POTENTIOMETER reference voltage be set to to have the LED come on? SR3 d. If the white LED has a VF of 3.0V @ 10mA, what would be a suitable value for R3?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

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2.
An Automatic Night Light uses a photocell to detect the amount of available light in a room. Under strong light the
resistance of the photocell is 1kn but goes up to 100k2 in total darkness. The photocell is put in series with a 4.7k2
resistor so as to make a voltage divider when the ends are connected between +5V and GND as shown. As it gets darker
in the room, the resistance of the photocell goes up and raises the voltage on the "Sensor Voltage" line. At "dusk", the
photocell has a resistance of 10k2.
Automatic Night Light
5v Vdd
a.
What will the range of the sensor voltage be as the photocell
+5V
goes from 1k2 (bright light) to 100k2 (total darkness)?
Photocell
b.
Write the equation for VoUT expressed in terms of the op-amp
Sensor Voltage
LM358AD
Vout
U1A
mmarceau
5V
inputs and gain. What is the maximum range for Vour?
Reference
R4
24.7ka
Voltage (V)
White LED
C.
Assuming the light is to come on at "dusk", what must the
POTENTIOMETER
reference voltage be set to to have the LED come on?
SR3
d.
If the white LED has a VF of 3.0V @ 10mA, what would be a
suitable value for R3?

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