- Electronics Projects
- 1.5v to 220v AC simple inverter
- Build Simple AM Radio receiver at home
- Simple Uninterruptible Power Supply (UPS) Circuits
- Single Transistor Amplifier Circuit
- 3.7v Lithium Battery Level Indicator
- LED Chaser using transistors
- Electronics Projects for Beginners
- Simple Latch Circuit Using Transistors
- DC to AC Power Converter circuit feature working
- Fire Alarm Circuit using Transistor
- Two Transistor Amplifier
- Laser Security System
- Music Operating Dancing LEDs light
- Volts Booster Circuit Using Ferrite ore transformer
- Touch switch circuit using Transistor
- Two transistor FM transmitter project
- LED Flasher Using Timer IC 555
- DC Voltage Power Supply Using The LM317
- Electronic Mosquito Repellent Circuit
- Light Dimmer Circuit 1000 Watts Using BT139
- Non-Contact Voltage Detector by using transistor
- 4 volts simple inverter project: explanation
- Flashing Police Lights Circuit
- Light Dependent Resistor, its types and applications
- 100 watts inverter circuit working and applications
- Stereo Audio Amplifier 5W Circuit using TEA 2025 IC
- Small High Volts using 2Sc 1815 transistor
- Electronic Doorbell Circuit using a 555 and CD4017
- Touch On Touch Off Switch Circuit Using 555 timer
- LM386 Audio Amplifier Circuit
- IC 4440 Amplifier Circuit
- Neon Lamp Circuits Working and Application
- Low Power Audio Amplifier Using integrated circuit
- Voltage Regulator Circuits using Transistor and Zener Diode
- Water Level Indicator Circuit Using Transistor
- LED Chaser using CD4017 IC
- Motion Sensor Light Switch
- Melody Generator Using IC um66
- Water Level Indicator Using IC
- Led Light to 220v AC
- LiFi Data Transfer System, WiFi vs LiFi
- How to Connect a CAR Battery | Polarity Checker
- Voltage Level Indicator Circuit
- Security Alarm Using PIR Sensor
- Battery Level Indicator Using LM 3914
- Single Transistor FM Transmitter circuit
- Different types of Capacitor
- Light Emitting Diode (LED) Types of LEDs
- Different Types of Relays
- Piezo buzzer features equivalent
- Clap Switch : Circuit and Its Working
- Different Types of diode, working and features
- PC817 Optocoupler Pinout, Equivalent, Features and applications
Motion Sensor Light Switch
A motion sensor light switch is a great way of saving energy shortfall periods. A PIR sensor light switch will automatically detect when someone enters the room or any place where the motion sensor is set. Then, after a few minutes(adjusted by your desires) when no movement has been detected, the lights will then automatically be turned off. Although a motion sensor switch is indeed a big and important invention. In fact, you can install a motion sensor light switch much in the same way as you would a single pole light switch.
Circuit Diagram Motion Sensor Light Switch
The circuit diagram of the motion sensor light switch is given below.
|3||Transistor||BC 547/BC548 or equivalent||1|
|6||PIR sensor||3.3 to 20V DC input||1|
|7||Bulb||AC bulb or DC bulb can be used||1|
|8||BCB||You can use it without PCB||1|
PIR sensor (Motion Sensor)
All living things (humans or animals), whose body temperature is more than 0 degrees Centigrade, emit the heat in form of infrared radiation through their body, also called thermal radiation. This Radiated energy is invisible to the human eye. These heat Signals can be detected by using a PIR sensor which is specially designed for such purpose.
This is a motion detector sensor that detects the movement of human beings and triggers its output to a High state (low or high). It operates in two modes low and high. The mode is selected by the jumper provided on the rear side of the PIR sensor PCB which is shown in the figure given below. If the sensor with an input voltage capability of 12V is not in your reach, use LM 7805/7806 regulator to control the 12v current if you give 12v current directly the sensor may be damaged.
Modes of PIR sensor light switch
Normal Mode: When the Passive infrared sensor detects motion it sets the output to High until the set time end, independent of the movements during the output HIGH time. This is a one-time triggering mode.
Re-Triggering Mode: When the PIR sensor detects motion, it sets the output to High until a set time becomes Low, but if it detects motion during its output High state 1, it again triggers the timer making it count from zero.
PIR SensorSensitivity Adjust
- With this potentiometer, you can set the range which you want.
- You will have to play a little with this to see what is the appropriate setting for your desired purposes.
- Increased sensitivity can be beneficial when using a PIR sensor for long-range, say up to 6 meters or more.
- A decreased sensitivity is good for a very short range say maximum range or up to 10 feet. Which in turn could miss movements at a longer range?
Delay Time Adjust PIR Sensor
The Delay Time indicates how long the PIR sensor will keep the Output High (ON) as detecting motion.
For example, when motion has been detected, you could set this somewhere between a few seconds to a few minutes time period.