Electronics

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

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 Computer Block Diagram of a Computer How 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 Required Arduino Uno L293D Motor Driver IC DHT22 Sensor 16×2 LCD Display DC Fan/motor 9V Battery 10KΩ Potentiometer 220Ω Resistor Breadboard Circuit Diagram Temperature Controlled Fan using Arduino – Circuit Diagram Explanation First we can connect L293D motor driver [...]

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Inverting Amplifier using Opamp - Circuit Diagram

Inverting Amplifier using Opamp

Inverting amplifier is an amplfier whose amplfied output is negatively proportional to the input. Its gain will be negative. For eg. if we provide sine wave input, its amplified output will be 180° out of phase with input. When the input is voltage is increasing, output voltage will decrease and vice versa. Recommended Reading : Opamp – Operational Amplifier We all know that the open loop gain of an operational amplifier is very high for practical applicaitons. So we will apply [...]

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EasyEDA vs DipTrace vs OrCAD

EasyEDA vs DipTrace vs OrCad

Today I am gonna write about my PCB designing journy that happend before 8 year. I started doing hobby circuits before 8 years and now I am doing professional circuits. Phase 1 : Hand Drawn (no Softwares) I started desiging PCB manually without using any softwares. Mostly I used graph papers to design PCB as it was very easy to make measurements and alignments. Several itrations of drawing was required to make even a small circuit. After the design is completed, I [...]

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