i want pcblayout of automatic room light controller visitor counter ....etc

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how we can make pcb layout design of varsatile object counter and about its coponent soldering ....etc

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The gas leakage alarm circuit operates off a 9V PP3 battery.
Zener diode ZD1 is used to convert 9V into 5V DC to drive the
gas sensor module. A preset in the module is used to set the
threshold. Interfacing with the sensor module is done through a
4-pin SIP header.
Whenever there is LPG concentration of 1000 ppm in the
area, the OUT pin of the sensor module goes high. This signal
drives timer IC 555, which is wired as an astable multivibrator.
The multivibrator basically works as a tone generator.
Output pin 3 of IC 555 is connected ....etc

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pcb layout guidelines

1. for prototype Whenever possible avoid using bread-board or vari-board with RF modules The long tracks inside these types of prototyping board introduce large capacitances /inductances to the circuit which can badly distort / detune rf signals. Ideally prototype or evaluation pcbs should be used.

2. Tracks connected to the antenna (RF input / output) pin of transmitter and receiver modules should be as short as possible. Any conductor connected to this track will act as an antenna, so it will lengthen and detune t ....etc

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hi.plz send me the pcb layout of fully automatic emergency light at [email protected] . thnx. ....etc

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i want the skin response meter pcb schematic and layout immediately ....etc

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To get full information or details of automatic low power emergency light light please have a look on the pages

http://seminarsprojects.net/Thread-AUTOMATIC-LOW-POWER-EMERGENCY-LIGHT

if you again feel trouble on automatic low power emergency light please reply in that page and ask specific fields in automatic low power emergency light ....etc

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i have to make my minor project and i have decided to make stress meter.
i m having all the details about that but i m not able to find the final layout of the stress meter circuit. ....etc

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SUMMARY:

This project is developed using 8051 microcontroller, to avoid railway accidents
in automatic mode the railway gate, if implemented in the spirit. This project
uses two powerful IR transmitter and two receivers. one pair of transmitter and
The receiver is installed up-side (where the train runs) at higher levels than
a human being is precise alignment and is similar to the other couple is fixed on the underside of the
in the direction of the train. Sensor activation time is adjusted by this time calculation
taken with a certain speed ....etc

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free download pcb layout file of cellphone operated land robot

In this project Cell Phone Operated Land Rover, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called DTMF (dual-tone-multiple-frequency).The robot perceives this DTMF tone with the help of the phone stacked in the robot. The received tone is processed by the (ATmega16) microcontro ....etc

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