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# Contributed Projects

Browse through a collection of 500+ interesting electrical & electronic Projects from 300+ contributors.

Check out some FREE Projects Here
Colour Detector using Arduino Microcontroller
Temperature Controlled System
Obstacle/Edge Detecting and Avoiding Vehicle
Computerized Wireless Robo-Vehicle
Cell phone operated Robotic Arm

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###### Latest Contributed Projects
As today world completely depends on the power saving, this prototype will help to decrease the power consumption. Here we are using this circuit for today's world to control AC 60W bulb using 8-bit microcontroller and we are using the concept of pwm (pulse width modulation) technique to control the 60W load by which we can decrease the light intensity and thus power consumption of the load indirectly got decreased.

The concept is very low such as to decrease the intensity we need to decrease the voltage of AC input. Here we are using a controlling part which consists of a TRIAC to control the AC voltage and also other feature is controlling the frequency of the signal. Keep on reading to find out how the circuit is assembled and put to use.

Have you ever wondered how thousands of people make phone calls and communicate at the same time, yet there are only 4 wires on each telephone pole, that accommodate all these calls. We all know that the is one wire to our house and one to the house of the person we want to call, but how is it possible that our lines and the lines of every other person living in our neighbourhood, all send information through only one common line, and furthermore, how is everyones information received simultaneously at the other end?

The answer lies in a simple concept called time division multiplexing. Although modern telecommunication networks use much faster and more efficient methods, time division multiplexing or TDM for short was an important communication technique in older days, and can still be used effectively for small networks.

16x2 alphanumeric LCD can display 16 characters in each of its row, and it has two rows. To interface an LCD we need to know about its internal registers and pin functions. An LCD has two important registers namely command register and Data register. Both are 8-bit registers. The command register is written with various commands by the user. These commands are responsible for the functioning of LCD. 16x2 LCD is widely used in various embedded applications. The reason for this is its easy operation and it can display a large number of characters and symbols. In this tutorial we’ll interface LCD with ARM7 based microcontroller LPC2138.

LCD can be interfaced in 8-bit as well as 4-bit mode (mode signifies Data bits sent at a time). In the 8-bit mode we require 8-pins of the microcontroller whereas in 4-bit mode the data is sent ‘nibble’ by ‘nibble’ (4 data lines used).

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