Digital Tachometer using Arduino Microcontroller

A tachometer is a device that is used to measure the speed of rotation of any device. Using the analog voltage reading property of an arduino, this can be easily implemented using the appropriate parts. Tachometers have a variety of applications, including measuring the speed of dc motors in order to ensure they are running according to specifications.

In order to make a tachometer, we will have to convert the speed of rotation into a readable form. The only form the arduino can read is in terms of electrical voltage. It is well known that if voltage is given to a motor the motor wheel will turn, the speed of which is determined by the amount of voltage given. However the converse is also true, meaning that if we were to rotate the motor by ourselves, we can obtain a voltage across the two ends of the motor terminals.

Check out the complete project here

More projects on arduino

Voice Recorder using IC aPR33A

In embedded or electronics projects there is need of voice guidance or the people making project in DTMF needs IVR system to give voice reply at the output. So most of the people prefer IPOD, MP3 player, or SDCARD Module. All the things are costly and difficult in connecting to the system. Sometimes even there is problem in sound generating some kind of noise.

The systematic or typical way is to use specialized voice circuitry which can be operated by any microcontroller and the message can be played by the microcontroller logic controlling the chip. This can be easily done using IC APR33A. This is new IC in the market. It can store recording upto 11 Minutes. And it can be operated upto message mode of 1/2/4/8, depending on the requirement of user.

Check out the details: Voice Recorder

Latitude & Longitude Display System Using GPS & AVR Microcontroller

This project is a reference to budding engineers or a helping hand to those who willing to work and interface a GPS Receiver with microcontroller and making their own channel to communicate with satellite, seeking for some useful information from satellite to make a effective and efficient system.

 Before we check all the details of this project, here is the final implemented circuit diagram of longitude and latitude display system using GPS and AVR microcontroller.

Check out this complete tutorial on Engineers Garage: AVR GPS Tutorial

How to Interrupt an Arduino Board

Interrupts are an important concept in every microcontroller platform. From executing a totally new function to stopping the whole program, interrupts form an important part, especially when multi functioning gadgets are to be designed.

Demonstrating interrupt’s usage in Arduino is this project where square waves generated work as interrupt. To program this Arduino unit, one needs to connect a computer through USB. For that an additional accessory, USB to TTL logic converter is needed. Adding this doesn’t make the system bulkier at all and hence is not resource wastage.

Invoking an interrupt is not that of a tough task in terms of programming for other micro controllers. However, since Arduino provides a structured approach towards hardware designing makes it easier to test features and model prototypes.

This project is not an application of Arduino but is more of a demonstration of features of the gadget. Arduino pro mini is one of the smallest Arduino board and all the accessories are to be soldered to it. Find out more details about the project at this link:

http://www.engineersgarage.com/embedded/arduino/how-to-interrupt-arduino-board-periodically

Arduino Based Color Detector Circuit Diagram

Coming to the basics, colors are just functions of frequency and wavelength. For all the multi colored gadgets we see around us: televisions, mobile phones, tablets, handheld gaming consoles etc etc all have their screens working on this game of frequency and wavelength only. When one can make a gadget emit waves of a particular frequency, it is particularly difficult to make a device which is able to recognize a color. In electronics, the frequency-wavelength extends to voltage supply to the light sources to get various shades of a color.  On this principal is what the LCD, LED and other high definition screens are based.

Shown here is an Arduino based color detector circuit which uses photodiodes and is able to detect the color which is dominating in the given picture/scene.  Adding open source hardware like Arduino makes such systems to be developed by any curious mind who intends to do it. Moreover, this circuit can even be tested on the breadboard meaning that no specialized PCB is needed. 

The outputs can be taken in quite varied form, for instance, one can make a color sensitive gadget, show the output on a computer monitor or program Arduino to show color on the LCD.

Want to make this circuit? Click here to find out some exclusive images, codes and content detailing with the basics and DIY’n of this circuit.

List of Simple Arduino Projects

Any AVR microcontroller based board which follows the standard arduino schematic and is flashed with the arduino bootloader can be called an arduino board. The arduino is refered to as open source hardware, since the standard schematic is open to everyone and anybody can make their own version of arduino board following the standard schematic

Check these Arduino Projects to Learn working with Arduino Board. 

  Getting Started with Arduino

How to Connect a Keyboard with 16x2 LCD using Arduino	How to Interface 4 Bit LCD with Arduino	How To Save a Text In The EEPROM of The Arduino
How to Connect PC with 16x2 LCD using Arduino	How to Interface a PS2 Keyboard with Arduino	How to Send Serial Data from Arduino
How To Connect The EEPROM of The Arduino To The Serial Port of a PC	How to Interface PS2 Mouse with Arduino	How to Test the Built-In EEPROM of the Arduino
How to Control Device using Mouse Connected with Arduino	How to Interface SD Card with Arduino	How to Test The SPI Module of Arduino
How To Create Animation on 16x2 LCD Using Arduino	How to Interrupt the Arduino Board Periodically	How to Use Analog Input and Analog Output of an Arduino Board
How To Create Custom Characters on LCD Using Arduino	How To Make a Simple Variable Frequency Generator Using Arduino	How to Use Arduino to Display Sensor Values on LCD
How To Create Running Sine Wave Display In LCD Using Arduino	How To Make Dynamic Sensor Display on LCD Using Arduino	How To Use Digital Input And Digital Output Of Arduino
How to Display Random Smiley on LCD using Arduino	How to Make LCD Scrolling Display using Arduino	How To Use Interrupts With Arduino Board
How To Display Smileys on LCD Using Arduino	How to Make SD Card to Store Sensor Data File using Arduino	How to Use PS2 Keyboard to Store Text in SD Card using Arduino
How to do Serial Debugging with Arduino	How To Read And Write The EEPROM Of Arduino	How to Use PS2 Mouse as an Accelerometer with Arduino
How to Generate a Variable Frequency Sine Wave Using Arduino	How to Receive and Send Serial Data using Arduino	How to Use PS2 Mouse to Move a Character in LCD
How To Generate Square Wave Using Arduino	How To Save a Sensor Value In The EEPROM Of The Arduino

Introduction to Face Recognition

Face Recognition is a computer technology for identifying and verifying a person from a digital image or a video frame from a video source. It emerged as a latest technology in Biometrics to provide an effective solution to address various requirements for identifying and verifying identity claims. Face Recognition is done by comparing the selected facial features from an image and the facial database.

There are various algorithms used for the face recognition which identify faces by extracting the features from the subject's face. The main features which are compared are the size and shape of eyes, nose, cheekbones and jaw, and relative positions of eyes, nose and mouth. These features are extracted and stored. Then the same are compared with the featuers of an image stored in the database. In various face recognition applications, an IRIS scanning camera is used to detect the iris of the subject. After snapping a picture of the iris, the various features like color, shape and size of the iris is extracted.

Considering the current development and employment, Face recognition seems to be a very bright future in upcoming years. Although the current face recognition algorithm fails under the vastly varying situations. But we can hope the next generation person recognition system will implement the face recognition technology effectively.

For Detailed article read the Face Recognition Article on Engineers Garage