Make a Digital Tachometer using Arduino

Tachometer is a RPM counter which counts the rotation frequency of a rotating body. Here is an Arduino pro mini based digital tachometer which uses IR sensor module (A combination of IR transmitter and receiver) to detect object for count rotation of any rotating body. As IR transmits IR rays which reflect back to IR receiver and then IR Module generates an output or pulse which is detected by the arduino controller when we press start button. It counts continuously for 5 seconds. 

Watch the working of tachometer in the below video:

It's fun, useful and easy to make. Find here the details of this project:

Tachometer using Arduino

Make a Line Follower Robot using Arduino

Robotics is fascinating! If you are well aware of basics of Arduino, you can build a simple line follower robot with a little coding and only few connections.

Line Follower Robot using Arduino

The concept of this arduino based line follower robot is quite easy and related to light. We have used here the behaviour of light at black and white surface. When light fall on a white surface it is almost full reflected and in case of black surface light is completely absorbed. This behaviour of light is used in building a line follower robot.

An IR transmitter and receiver module is used to identify the black line, along with Arduino and DC motors and motor driver IC.

Here you can watch the video showing the line follower robot in action
:


 For more such projects, visit: Circuit Digest

An Arduino Based Temperature Sensor

This interesting DIY thermometer project uses an Arduino Uno board and LM35 temperature sensor to display current ambient temperature on a 16x2 LCD screen attached with Arduino. This block diagram shows the working of this project.

LM35 temperature sensor is used for sensing environment temperature which gives 1 degree temperature on every 10mV change at its output pin. You can easily check it with voltmeter by connecting Vcc at pin 1 and Ground at pin 3 and output voltage at pin 2 of LM35 sensor. For an example if the output voltage of LM35 sensor is 250m volt, that means the temperature is around 25 degree Celsius.

Interfacing LED with 8051 Microcontroller

LED Interfacing program is the first program you would like to write while getting started working with 8051 series or any other microcontrollers. Here is a tutorial for those who want to learn 8051 microcontroller programming - Tutorial on LED Interfacing with 8051 Microcontroller

Here basic concepts of working with 8051 microcontrollers are covered with pin diagrams of 89S52 microcontroller and their role in the microcontroller. 

Check this complete tutorial and try your hands on this small experiment by writing a simple C program to blink an LED.

Source

PIR Sensor Based Motion Detection Circuit

Motion detector alarms are sheer necessity in modern homes and offices. Motion detection sensors are used in such types of intruder alarms, security alarms. Here we have designed a simple demo motion detector security alarm which detects the presence of human being in the range of the detector and buzz an alarm when it founds the presence.

PIR(Passive Infrared)  sensors have a lot of applications like used here in an automated staircase lighting. PIR sensor is used here and connected with a buzzer in the circuit. PIR sensors have a range of around 3 meters and when someone enters in its range it sends the signal to buzzer.

Here is the complete circuit - PIR sensor circuit diagram

You can build it more complex and usable by adding a microcontroller into it.

Make a four way traffic light signal project using IC 555

This simple project demonstrates the working of a traffic light signal. It uses a 555 timer IC and a decade counter to build this four way traffic light circuit. 

The concept of this project is very simple. The ten stage DECADE COUNTER have a memory of ten, that means, it can count upto ten pulses. So for every peak at clock, the counter admits it as an event and remembers it. The number of events that counter memorized outputted by corresponding pin.

Visit the link below for complete circuit diagram and explanation of its working.

http://circuitdigest.com/electronic-circuits/four-way-traffic-light-circuit

For more such projects visit our electronics circuit section.

A Simple DIY Metal Detector without using Microcontroller

A metal detector is a device which detects metallic objects. They are commonly used for security purposes on airports, railway stations, malls, etc to prevent entering metal objects like Arms into the premises. 

Designing a metal detector is not that difficult and you can design one simple metal detector circuit without using any microcontroller and by merely using commonly used 555 timer IC. 

This circuit works on 9v DC power supply and uses a copper coil to detect the metal objects. You can find the schematic diagram and detailed explanation of concepts used in this circuit here:

http://circuitdigest.com/electronic-circuits/simple-metal-detector-circuit