Smoke Alarm

Smoke Alarm In this project a smoke detection alarm system is discused. The optical sensor consists of an IR diode and a photodiode with a small gap in between. During normal condition the photodiode is receiving the IR signal from the IR diode. The photo interrupter module is used as the smoke detector, while timer 555 is wired in astable

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Digital Voltmeter Using 8051

Digital Voltmeter Using 8051 This article is about a simple 0-5V voltmeter using 8051. This digital voltmeter has a sensitivity of  200mV which is a bit low but this project is meant for demonstrating how an ADC and seven segment display can be interfaced to 8051 to obtain a digital readout of the input voltage. ADC0804 is the ADC and AT

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Water Level Indicator

Water Level Indicator Description: This is the circuit diagram of a simple corrosion free water level indicator for home and industries. In fact the the level of any conductive non corrosive liquids can be measured using this circuit. The circuit is based on 5 transistor switches. Each transistor is switched on to drive the corresp

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Resistor Colour Coding

Resistor Colour Coding Resistor's Look: 1st Band   - It tells the first significant value 2nd Band  - It tells the second significant value Multiplier  -It simply tells the number of zeros Tolerance  -It tells the tolerance of the resistor Colour's Values: The Values of colours can be seen from the imag

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Off Topic-No Arms No Legs No Wories(Must Watch)

Nick Vujicic-An Inspiration (Must Watch)     Words cant describe about him click the link to see it yourself-http://www.youtube.com/watch?v=ciYk-UwqFKA

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Game Timer

Game Timer About The Project: The complete circuit diagram for the simple Games Timer is shown in Figure below.Essentially, it comprises one building block based on a single 555 timer IC (integrated circuit), wired as a monostable. The circuit produces an audio alarm after a preset time delay. Circuit Diagram: Working: Push switch S2 i

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Digital Stop Watch

Digital Stop Watch About The Project: A digital stop watch built around timer IC LM555 and 4-digit counter IC MM74C926  with multiplexed 7-segment LED display. MM74C926 consists of a 4-digit counter, an internal output latch, npn output sourcing drivers for common cathode, 7-segment display and an internal multiplexing circuitry with fou

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