Electronics, embedded, microcontroller, pic, projects, hobby circuits, circuit, blog, transistor, technology
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 16x2 LCD Display DC Fan/motor 9V Battery 10KΩ Potentiometer 220Ω Resistor BreadboardCircuit Diagram
Temperature Controlled Fan using Arduino...
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...
EasyEDA vs DipTrace vs OrCad
Today I am gonna write about my PCB designing journey that happened before 8 year. I started doing hobby circuits before 8 years and now I am doing professional circuits.
Phase 1 : Hand Drawn (no Software)
I started designing 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 iterations of drawing was required to make even a small circuit. After the design is completed, I...
Virtual Ground – Opamp
What is Virtual Ground ?
As the name indicates it is virtual, not real ground. For some purposes we can consider it as equivalent to ground. In opamps the term virtual ground means that the voltage at that particular node is almost equal to ground voltage (0V). It is not physically connected to ground. This concept is very useful in analysis of opamp circuits and it will make a lot of calculations very simple.Virtual Ground - Opamp
Lets see how the virtual...
ESP8266 – WiFi SoC
WiFi SoC (System on Chip)
ESP8266 is the most popular and low cost WiFi SoC with TCP/IP stack and a low power 32 bit microcontroller manufactured by Espressif, a Shanghai based Chinese manufacturer. As you might already know, nowadays IoT (Internet of Things) is an emerging field. This is the one of the most popular and low cost solution for connecting 'Things' to internet via WiFi. ESP8266 - WiFi SoC ESP8266 belongs to Espressif System's Smart Connectivity Platform (ESCP) which is...
LED Chaser using 4017 Counter and 555 Timer
Introduction
A simple LED chaser hobby circuit can be made using 555 timer and CD4017 counter IC. You can use this circuit for decorative purposes. By modifying the circuit in a proper way, you can even use this to control lights working on AC mains.Components Required
CD4017 Counter IC - 1 555 Timer IC - 1 LED - 11 680Ω Resistor - 11 10KΩ Resistor - 1 10KΩ Variable Resistor - 1 10μF Capacitor - 1 0.01μF Capacitor - 1 9V...