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To do so, we used the NPN transistor based H-bridge bidirectional motor driver circuit interfaced to the digital output of the microcontroller. Taking the home in consideration, there are appliances which can be controlled by using remote controller or mobile phones using either applications designed to control or using DTMF. Mobile phones can be used to switch ON the TVset, refrigerator or air conditioners. A person can leave his home in the morning with a normal weather but they might be change in the weather and decide to turn OFF or turn ON his AC before he comes back to regulate his room. Now a phone can be used to scan papers or pictures. Mobile phones have brought about more good results on health facts like the eradication of infrared rays, laser beams which appears to be dangerous to health.
The contact that connects the output to input in SPDT is calledpole. The spring-like structure symbolizes an electromagnetic coil. A mighty STEM kit for beginners of all ages to learn electronics, programming, and robotics. If the door is either fully opened or fully closed then the controller stops the current supply to the door motor, thereby saving current and ensuring the long life of the door motor.
Home Automation using IoT | IoT project
Moreover, the MQ6 GAS sensor for detecting the leakage of LPG is an added advantage of this project. When leakage is detected it should run an alarm and switch on the exhaust fan to reduce the density of GAS. For demonstration purposes, I have used LEDs and in the circuit diagram, I have mentioned how to connect a relay in order to connect high-current devices. After detecting the message it will enter into the corresponding loop of SET or RESET pins.
You can expand the number for devices you want to control by using more relays. As technology develops, there are a lot of devices and gadgets to keep you safe at home. Instead of spending a fortune on security setup, you can build your own automation security and monitoring system with a simple engineering project. LM35 is a reasonable temperature sensor available in any of the electronics shops.
Introduction: DIY Smart Home Automation Using Android
The Vcc2 or VS pin of L293D should be connected to VIN pin of Arduino. Input 1 and Input 2 pins of IC are connected to 10 and 11 pin of Arduino and output pins are connected to relays pins. But after login, it only displays the main screen of turning on and off the appliances.
In the Arduino board, there is a voltage regulator to maintain the voltage. In this project we are dealing with an Alternating Current source, in short, that is called AC. So we need a minimum 5V-6A Relay or Relay module if we want to operate home appliances. To make the connection among all the things there is needed some jumper wires, normal copper wires(0.75mm or above), and a USB-A type cable. So, the main logic behind it is to communicate between two machines like our human beings communication.
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The data is exchanged serially between the two devices. A LINK status pin to the microcontroller from the Bluetooth UART tells it that the android client is successfully connected to the host. Next, to control two light one inside and other outside the home , a fan/AC and a television we have four relays connected to the microcontroller via the NPN transistor based buffer circuit. There are five types of sensors used in the project those are being directly interfaced to the microcontroller.
Two Relays are connected to L293D to operate two AC appliances. Relay has total five pins, in which two pins are connected to L293D and GND. And COM Pin is connected to AC mains Live terminal and NO pin of Relay is connected to one terminal of the Bulb.
Circuit Schematics of Android Home Automation Project
Use, by you or one client, in a single end product/research which end users/readers are not charged for. The total price includes only the project material price. Home automation may have sounded like fiction in the 20th century but coming into the 21st century brought many innovations that made it possible.
Semicon Media is a unique collection of online media, focused purely on the Electronics Community across the globe. With a perfectly blended team of Engineers and Journalists, we demystify electronics and its related technologies by providing high value content to our readers. Circuit diagram of this Bluetooth controlled Home Automation is simple and connections can be made easily. LCD, Bluetooth Module HC05 and L293D Driver IC are connected to Arduino. The ANDROID client will use bluetooth to wirelessly connect to the host device. Use five sensors to monitor the state of home namely temperature, light intensity,motion, LPG leak and door/window status.
Automation is also involved in building management system in which lights, temperature, security devices and other appliances are controlled through a high degree of computer involvement. In this report, an android based smart phone is used. Home automation is not a new thing but the advanced automation system in nowadays require a big and expensive infrastructure. In this report, we have proposed a low cost, flexible secure automation system that can easily control TV, tube lights and fans from android based mobile phone using Bluetooth.
Home automation can range in complexity from the simple gadgets and gizmos that provide control over individual components to individual home sub-systems and integrated whole house systems. A feedback circuit is also designed and implement to check the current status of the device after it receives the command from mobile phone. The communication is done one by one at one time in both direction between the android mobile phone and Bluetooth module. To sense the LPG leak in the home we used the MQ-5 LPG sensor and it is interface to the ADC input of the microcontroller. This sensor is connected to the digital input of the microcontroller pulled up externally. To sense the presence and motion we used the PIR sensor that has a digital output and it is also connected to the digital input of the microcontroller pulled up externally.
It may also include home security such as access control and alarm systems. When connected with the Internet, home devices are an important constituent of the Internet of Things. The fun part about this automation is you can control up to eight devices, which may include a high-power water pump. Our life becomes very easy with the coming of new technologies like mobile phones, laptops, etc.
You can develop and debug with the Android emulator or with a real device . Basic4android has a rich set of libraries that make it easy to develop advanced applications. The H-bridge circuit is used to drive a DC motor in both the directions. It can also use relays to function but here we used the BJT based one.
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