In this circuit, we will show how to build a delay before turn off circuit with a 555 timer chip.A delay before turn off circuit is a circuit that once you apply power to it turns on the output right away. The output stays on for a few seconds and then turns off. There is a delay before the output turns off.A delay before turn off circuit can be useful for any circuit that needs to be on only for a short period of time, such as a timer. Say you want a circuit to only be on for 10 seconds and then stop. Then this circuit has perfect application.

Here is a 100 Watt inverter circuit using minimum number of components. I think it is quite difficult to make a decent one like this with further less components.Here we use CD 4047 IC from Texas Instruments for generating the 100 Hz pulses and four 2N3055 transistors for driving the load. The IC1 Cd4047 wired as an astable multivibrator produces two 180 degree out of phase 100 Hz pulse trains. These pulse trains are preamplified by the two TIP122 transistors.The out puts of the TIP 122 transistors are amplified by four 2N3055 transistors (two transistors for each half cycle) to drive the inverter transformer.

In this project, which based on DTMF decoder Ic M8870, we showing the output of M8870 ic in 7 segment. The 4 bit data output of M8870 ic further connected with LS7447 decoder which is BCD decoder to 7 segment display unit.

Input tone from mobile gives to M8870 ic which further connected to BCD decoder LS7447 ic and then 7 segment.

At basic level on microcontroller you can create this interesting project of digital thermometer. It teaches you how to acquire analog data from a sensor and display it on a lcd. We will use a popular MCU PIC16F877A to implement this mini project. The temperature will be read using a LM35 precision sensor. Final result will be shown on a 16×2 alphanumeric lcd module.

Just like my previous circuit using LM358 this is also very cheap,also under 100 rupees. This is a circuit for controlling the street lights,garden lights,automatically. You don’t need to turn it on and turn it off again and again,  just turn on the circuit once and forget, it will automatically manage itself by sensing the available brightness in the garden or street.

IR based security alarm circuit can detect any movement and trigger the alarm. This circuit is very useful in homes, banks, shops, restricted areas where an alert alarm is needed on any movement. This circuit is based on IR sensor where an IR beam is continuously falling on a photodiode, and whenever this Infrared beam breaks, by any kind of movement, alarm is triggered.

This project is about a simple humidity sensor based on 8051 microcontroller. Humidity sensor is also called hygrometer. This circuit can sense relative humidity (RH)  from 20% to 95% at an accuracy of 5%. The humidity information is displayed on a 16×2 LCD display. A relay is also provided which is set to be active when the humidity crosses a certain trip point. The circuit is mains operated and it is very easy to install. DHT11 is the humidity sensor used here. The details and working of the DHT11 humidity sensor is given below.

In this post, I will build a great sounding audio amplifier with the LM386 Low Voltage Audio Power Amplifier IC. I built almost a dozen different audio amplifier circuits with the LM386 but most of them produced way too much noise, popping, and other interference.

Early in the study of electronics we are introduced to magnetism. The lines of force can be demonstrated by iron filings on a sheet of paper with a magnet underneath. In school science class, we made electromagnets from nails and wire. These were valuable lessons and helped us understand the principals of the telegraph, generators, relays, motors, and transducers. All of these devices produce magnetic energy to control the movement of metal objects.

Hello friends, hope you all are fine and having fun with your lives. Today, I am going to share a Traffic Signal Control Project using Arduino. Few days earlier, I have posted the same tutorial but it was Traffic Light Signal Using 555 Timer in Proteus ISIS and today we will do the same thing but using Arduino programming. Its quite a simple but good starting project onArduino. So, if you are new to Arduino then must give it a try.

Amazing 3 dimensional LED display.64 LEDs makes up this 4 by 4 by 4 cube, controlled by an Atmel Atmega328 microcontroller [I’m using an Arduino UNO]
Each LED can be addressed individually in software, enabling it to display amazing 3d animations!

In this project we will develop a tone generator using Arduino Uno. We will have buttons interfaced with the UNO and each one of them generates different intensity of tone. The frequency of tone generated by the UNO is same at every internal. It’s the intensity of the sound which changes with each press. This is the one of the easiest way to make a piano with Arduino Uno. Also check thisPiano circuit.

Hey everyone.
I hope you will be fine.As you know that last time, we had started Arduino UNO course and given you a brief introduction how to simulate the LED blinking and Servo motor control via Arduino UNO and its implementation in proteus ISIS.
Now, today we are going to implement Stepper Motor Simulation using Arduino UNO in proteus ISIS.

Security is a major concern in our day to day life, and digital locks have became an important part of these security systems. One such digital code lock is imitated in this project using arduino board and a matrix keypad.

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In above said project we have implemented a robotic drive which will be of differential mode while in its movement and will be controlled simultaneously by a remote control. The term ‘differential’ means that robot turning speed is determined by the speed difference between both wheels, each on either side of your robot. For example: keep the left wheel still, and rotate the right wheel forward, and the robot will turn left. 

In this tutorial I’ll show you how to turn an Arduino into a clock using a 1602 LCD screen, an Arduino, a hand full of jumpers and a Real Time Clock chip/module. Great as an accessory for your desk at home or work.

In this post, I will build three different capacitance meters using an Arduino. With all of the different ways capacitors are labeled, determining capacitor values can get confusing. This is a really useful project that is easy to set up, especially if you don’t have a digital multi-meter. After measuring your capacitors you can label them to save time when you are searching for a particular one.

In this Project you will see how to make display a scrolling text message in a led 8x8 matrix with basic components and Arduino. The message can be altered changing the sketch. 

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interfacing bluetooth with 8051 microcontroller THIS A VERY GOOD 8051 PROJECT CODE WRITTEN IN C LANGUAGE

In this weekend project, we’ll be making a tough traveler’s notebook using the Coptic binding method. This unique binding method is one of the oldest in human history, dating back as early as the second century, and allows the book to lay flat when opened to any page.

When I first thought of these tracks, I was planning on making something quite large and heavy, which required a lot of traction. We'd had a few bad winters and living off the beaten track in a rural area, the roads were never cleared of snow. My wife used to drive a BMW and anyone, who has attempted to drive a BMW through thick snow, will appreciate, the difficulty.