This document describes a sensor switch circuit project submitted by 6 students to their lecturer. It includes an introduction to sensors and sensor circuits. The components used in the circuit are listed. A circuit diagram and PCB design are provided, along with demonstrations of applications. The applications discussed include temperature, IR, ultrasonic, touch, proximity, pressure, and level/smoke/gas sensors. The conclusion discusses how sensor circuits can enable home and industrial automation by controlling electrical loads based on sensor input. References with more information on relay switch circuits, tilt sensors, and light sensors are also provided.

1. Sensor
Switch
Circuit
Submitted to
S. M. IMRAT RAHMAN
Lecturer,
Department of EEE,
American International
University-Bangladesh

2. Submitted By
1. RAVI, MD. FARDIN IQBAL 14-25809-1
2. BHUIYAN, A. OWADUD 15-29131-1
3. KHAN, MD. TASDIKUL ISLAM 15-29210-1
4. ISLAM, MD. SHEHABUL 15-29700-2
5. SHUVO, FALGUNI DAS 15-29789-2
6. RIFAT, MD. HIMEL AHSAN 16-31271-1
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3. 1.
Contents
 Introduction
 Components
 Circuit Diagram
 PCB Design
 Project Demo
 Applications
 Conclusion
 References

4. Introduction
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A device which gives an output by detecting the
changes in quantities or events can be defined as
a sensor. Generally, sensors produce an electrical
signal or optical output signal corresponding to
the changes in the inputs. There are different
types of sensors. The circuit using any sensor is
identified as sensor switch circuit.

5. Components
 Relay: 12V – 2 pcs
 Transistors: 2N2222A – 3 pcs
 Diode: 1N4007 – 2 pcs
 Resistors: 10 Kohm – 3 pcs, 100 ohm – 2 pcs,
100 kohm, 47 Kohm, 330 ohm, 220 ohm – 1
pc
 D5: 1N4148 – 1 pc
 IC 555 – 1 pc
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6. Circuit Diagram
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7. PCB Design
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8. Project Demo
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9. Applications
 Temperature Sensor
 IR Sensor
 Ultrasonic Sensor
 Touch Sensor
 Proximity Sensors
 Pressure Sensor
 Level Sensors
 Smoke and Gas Sensors
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10. Conclusion
Generally, we use conventional wall socket switchboards
for switching on the industrial appliances or home
appliances such as fan, cooler, industrial motors, and so
on. But, it is very difficult to operate the switches
regularly. Hence, home automation and industrial
automation systems are developed for ease of controlling
all the required electrical and electronics loads. This
automation in power system can be designed using
various types of sensors and sensor circuits.
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11. References
 https://www.elprocus.com/types-of-sensors-with-
circuits/
 https://www.electronics-tutorials.ws/blog/relay-
switch-circuit.html
 https://circuitdigest.com/electronic-
circuits/simple-tilt-sensor-switch-circuit-diagram
 https://www.edgefx.in/light-sensor-circuit-
working-operation/
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12. Thanks!
Any questions?