Electronics, embedded, microcontroller, pic, projects, hobby circuits, circuit, blog, transistor, technology

BLDC Ceiling Fans

Normal Fans vs BLDC Ceiling Fans

Ceiling fan is the most widely used domestic cooling appliance in India. These machines usually run for hours and are often known to be energy hoggers. They make up a large percentage of the total residential energy consumption in tropical countries like India. In such a scenario, the advent of BLDC fans in the market is helping change the situation for the better by promoting energy efficiency. Compared to conventional ceiling fans, BLDC fans are much more technologically advanced. [...]

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I²C Bus Logo

I²C – Inter-Integrated Circuit

I²C or I2C is an abbreviation of Inter-Integrated Circuit, a serial communication protocol made by Philips Semiconductor (now it is NXP Semiconductor). It is created with an intention of communication between chips reside on the same Printed Circuit Board (PCB). It is usually used to interface slow speed ICs to processor or microcontroller. It is a master-slave protocol, usually a processor or microcontroller is the master and other chips like RTC, Temperature Sensor, EEPROM will be the slave. We [...]

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HC-05 Bluetooth Module

HC-05 Serial Bluetooth Module

Bluetooth is a technology for wireless communication. It is designed to replace cable connections.It uses serial communication to communicate with devices. It communicates with microcontroller using serial port (USART). Usually, it connects small devices like mobile phones, PDAs and TVs using a short-range wireless connection to exchange documents. It uses the 2.45GHz frequency band. The connection can be point-to-point or multi-point where the maximum range is 10 meters. The transfer rate of the data is 1Mbps. HC-05 Bluetooth module provides switching [...]

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Wailing Siren using 555 Timer

Wailing Siren using 555 Timer – Hobby Project

Today we shall talk about a really amazing circuit that produces a sound of a siren. There are different types of circuits that produce different kinds of sounds. Here is a simple circuit that produces wailing siren. The main principle of this circuit is to produce a wailing siren. The 555 timer IC is operated in astable mode. When the switch is pressed, speaker produces high pitch siren and when it is released, its pitch decreases and is switched off [...]

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Mobile Phone Detector Circuit

Mobile Phone Detector Circuit

This is a very interesting hobby project which can detect active mobile phone or GSM communication in its proximity. Active mobile phone means there is some live communication is going on like calls, sms sending or receiving etc. This circuit can be used to prevent unauthorized use of mobile phones in examination halls, conference rooms etc. As you already know, today’s mobile phones (2G, 2.5G, 3G, 4G, LTE) are operating in electromagnetic signals ranges from 700MHz to 3500MHz. Each countries [...]

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SPI Communication

SPI – Serial Peripheral Interface

SPI (Serial Peripheral Interface) is a full duplex synchronous serial communication interface used for short distance communications. It is usually used for communication between different modules in a same device or PCB. SPI devices communicates each other using a master slave architecture with a single master. Multiple slaves are supported through individual slave select lines. SPI Interface SPI is called as a 4-wire bus as it requires four wires for its communication as shown below. In the case of single slave [...]

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Intel Core i7 Processor

What is a Microprocessor ?

What is a Microprocessor ? A microprocessor is an integrated circuit (IC) which incorporates core functions of a computer’s central processing unit (CPU). It is a programmable multipurpose silicon chip, clock driven, register based, accepts binary data as input and provides output after processing it as per the instructions stored in the memory. Block Diagram of a ComputerBlock Diagram of a ComputerHow does a Microprocessor work ? A processor is the brain of a computer which basically consists of Arithmetical and Logical [...]

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Temperature Controlled Fan using Arduino

Temperature Controlled Fan using Arduino

Here we are going to make a temperature controlled DC fan. DHT22 sensor is used to sense the room temperature and then we adjust speed of a DC fan/motor accordingly using PWM (Pulse Width Modulation). Arduino Uno is the heart of this project and a L293D driver IC is used to drive the DC fan/motor. Components RequiredArduino Uno L293D Motor Driver IC DHT22 Sensor 16×2 LCD Display DC Fan/motor 9V Battery 10KΩ Potentiometer 220Ω Resistor BreadboardCircuit Diagram Temperature Controlled Fan using Arduino – Circuit Diagram Explanation First we can connect L293D motor driver [...]

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