• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About Us | Contact | Disclaimer | Copyright | Videos 

Op Amp Basics | 555 Circuits | Hobby Circuits | LED Driver | For Beginners | Basic Circuits | Transistor Circuits | Voltage Regulators 

You are here: Home / Mini Projects / Simple Home Automation Circuits

Simple Home Automation Circuits

Last Updated on March 31, 2023 by Swagatam Leave a Comment

In this post we will discuss a few useful yet easy to build home automation circuits which will help the user to create automatic electronic systems at home.

What is Home Automation

Home automation basically means converting many of the manually operated home electrical devices into automatically operated devices, through electronics.

Today's real home automation systems involve the use of mobile app to control many of the home electrical systems from any place inside home or even outside home.

However, in this article we won't be discussing such complex app controlled systems because these are difficult to design and configure.

Instead, we are going to check out simple to build electronic devices for creating a few automatic systems which can make the life of the user easier and convenient.

The main idea of these circuits is to bring more comfort and security in the life of the user.

Which Circuits will be Discussed Here?

The circuits which will be discussed here are as follows:

  • Remote control for AC electrical loads
  • Automatic porch light and garden light circuit
  • PIR controlled burglar alarm circuit
  • PIR controlled automatic bathroom, staircase light circuit.
  • Mobile app controlled simple automatic door lock.

The above mentioned units can be further customized for making other interesting home automation systems.

Let's discuss the above circuits one by one.

Remote Control for 220V Electrical Load

When an electrical load such as light or fan is configured with this circuit, it can be controlled remotely using any ordinary remote control.

caution electricity can be dangerous

Complete parts list and explanation is given in this article;

The remote control handset can be any IR remote control unit such as a TV remote control.

The sensor stage is built using IR sensor TSOP1738 IC. This sensor is configured with a flip flop stage built using the C 4017.

When this sensor is triggered with a TV remote, the output from the sensor activates the 4017 cock input.

The alternating clock pulses generated by the TSOP1738 sensor causes the IC 4017 to toggle its output in a flip flop manner.

This flip flop output from the IC 4017 toggles a connected relay ON/OFF.

Any electrical load connected with relay can be now toggled ON/OFF through the alternate pressing of the TV remote button.

This simple remote controlled relay circuit can be used to automate the ON/OFF switching of any home appliance.

Automatic Porch Light

The automatic porch light is another electronic circuit which can be use to automate the switching of the porch lamp.

For the parts list and the complete explanation please refer to this article.

It is basically an LDR based circuit which senses the ambient light conditions and switches OFF the lamp at day break and switches ON after evening.

The porch light can be also be used to control any other outdoor lamp such as a garden lamp.

The functioning of the automatic day night porch lamp is simple.

As long as there's sufficient day light falling on the LDR, the transistor remains switched ON. This keeps the relay also switched ON. However, in this condition the lamp being connected with the N/C keeps the lamp switched OFF.

When the day light diminishes below a certain threshold, the LDR resistance increases causing the transistor relay to switch OFF. The relay now changes position to the N/C contacts, switching ON the lamp.

PIR Burglar Alarm Circuit

The next home automation circuit is a PIR controlled simple burglar alarm circuit.

The circuit can be positioned at the entrance of the house, on a window or in any area which needs to be monitored against potential intruders.

The PIR is a device which is designed to detect the IR heat signals from a living thing such as a human body.

Whenever there's any human intervention within the detection range of the PIR, a tiny pulse is released by the PIR.

This pulse is then used to switch ON a transistor relay circuit which in turn triggers ON a connected alarm or a siren.

The alarm sounds and alerts the home owner regarding the presence of a human intruder within the restricted area.

PIR Controlled Bathroom Lamp or Staircase Lamp

The same PIR circuit explained above can be effectively used for controlling bathroom light, staircase, lamp or corridor lamps.

This will fully automate the area where the PIR circuit is installed.

For example, if the PIR circuit is installed in the bathroom then the switching of the bathroom lamp will become fully automatic. The lamp will remain switched ON only as long the user is present in the bathroom, and the lamp will be switched OFF automatically when the user leaves the bathroom.

The same functioning can be expected if the PIR circuit is installed in the staircase. The staircase lamp will be automatically switched ON whenever a user wants to use the staircase. The lamp will remain turned off as long as the staircase is vacant and not being used.

This system can keep the lamps of the above areas switched OFF while it is not being used, saving electricity and increasing the lamp life.

Mobile app Controlled Simple Automatic Door Lock

In this home automation circuit, a simple electronic door lock is operated through a sound frequency generated from a mobile app.

The mobile app a sound frequency generator set to generate a specific sound frequency.

The automatic door lock has a frequency detector which detects this specific frequency for around 3 seconds.

After 3 seconds of detection the door lock pulls back the solenoid shaft, releasing and opening the door lock.

This lock is fool-proof because it detects and opens the lock only when a specific frequency is detected. It will not respond to any other unknown frequency.

The 3 second delay makes sure that no randomly adjusted frequency would work to break the code and the lock.

This delay feature is not shown in the diagram. It will need to be included using a BJT stage with pin#8 of the LM567 IC.

The heart of the circuit is the LM567 tone decoder which implements the main frequency detecting function.

The specific frequency output from the mobile phone is introduced close to the MIC. This is done by activating the mobile app frequency generator and bringing the mobile speaker close to the MIC of the circuit.

The frequency detected by the MIC is amplified by the LM386 IC and is fed to the frequency detection input of the IC LM567.

The LM567 IC detects and checks the frequency, if it matches its internal set frequency then it switches its pin#8 low.

As soon as pin#8 turns low it drives the TIP127 transistor and the attached solenoid is turned ON.

The solenoid lock now opens, so that the user can open the door.

The detection frequency of the LM567 IC can be calculated using the following formula:

fo = 1 / (1.1 × R4 × C9)

You'll also like:

  • 1.  Simple Shop Shutter Guard Circuit to Safeguard your Shop from Theft
  • 2.  Solar Stud Light Circuit 
  • 3.  Making a “Helping Third Hand” for Aiding Soldering Jobs
  • 4.  3 Simple Solar Panel/Mains Changeover Circuits
  • 5.  Simple ESR Meter Circuit
  • 6.  Simple Ceiling Fan Regulator Circuit

About Swagatam

Swagatam is an electronic engineer, hobbyist, inventor, schematic/PCB designer, manufacturer. He is also the founder and the author of the website: https://www.homemade-circuits.com/, where he loves sharing his innovative circuit ideas and tutorials.
If you have any circuit related queries, you may interact through comments, and get guaranteed replies from the author.

Reader Interactions

Have Questions? Please post your comments below for quick replies! Comments should be related to the above artcile Cancel reply

Your email address will not be published. Required fields are marked *



Primary Sidebar

Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (27)
  • 555 IC Circuits (99)
  • 741 IC Circuits (20)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (126)
  • Battery Chargers (83)
  • Car and Motorcycle (96)
  • Datasheets (78)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (101)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (121)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (14)
  • GSM Projects (9)
  • Health Related (22)
  • Heater Controllers (31)
  • Home Electrical Circuits (107)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (13)
  • LED and Light Effect (98)
  • LM317/LM338 (22)
  • LM3915 IC (25)
  • Meters and Testers (69)
  • Mini Projects (150)
  • Motor Controller (69)
  • MPPT (7)
  • Oscillator Circuits (25)
  • PIR (Passive Infrared) (9)
  • Power Electronics (35)
  • Power Supply Circuits (86)
  • Radio Circuits (10)
  • Remote Control (50)
  • Security and Alarm (66)
  • Sensors and Detectors (132)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (63)
  • Timer and Delay Relay (55)
  • TL494 IC (5)
  • Transformerless Power Supply (9)
  • Transmitter Circuits (42)
  • Ultrasonic Projects (17)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations