MINI LCD SCOPE

MINI LCD SCOPE
			The MINI LCD SCOPE is a handy little item of test gear and of benefit to anyone’s workshop. Using an alphanumeric liquid crystal display (LCD), it is basically a signal tracer, but one with the great advantage that it shows a representation of the signal waveform that is being raced. This is shown across eight of the LCD character cells and is a real-time trace of the monitored waveform. Not only that, the display also shows the frequency of the signal being monitored, and its peak-to- peak voltage. The frequency range covered is basically for audio, but frequencies well to either side of this range can be traced. Several ranges of control are offered by switch selection, covering the sampling rate, and synchronization on/off for the ‘scope display. The signal input is switch able to provide different maximum peak voltage monitoring ranges. Selection of AC or DC input is provided.

Electronic eye with dialup

Electronic eye with dialup

Electronic Eye:- This project is based on high sensitive IR Transmitter & Receiver having range of more than 15 feet. When you are away for your house any if anyone tries to enter the house by any means the device shouts CHOR-CHOR-CHOR-PAKDO-PAKDO-PAKDO Continuously more than 40 seconds, that is enough to chase the thief, he will run away so your house is protected. The device not only shouts but also dials out previously stored telephone number ( which you have stored) and gives you the message CHOR- CHOR- CHOR. So that you understand that something is wrong at your house, you can immediately call up your neighbor to look after your house. Working Description of Electronic Eye with Dial-Up 1. Keep the transmitter & receiver aligned in a straight position facing each other about a distance more than 2 meter but not less than that.2. Connect the two 1.5v cells inside the bobbin of transmitter module properly.3. Connect the telephone line to telephone line input of the circuit.4. Connect the mains cord to 230v AC of your supply & switch on the supply.5. When you switch on the supply if the circuit initially plays any alarming message only press the reset switch to make the message off.6. The message will reset only after completing the total message when you have pressed the reset switch SW1.7. If the message is continuously playing after the reset switch has been pressed means that the transmitter (TX) & receiver (RX) is not properly aligned or it is being obstructed.8. Switch on the power supply if no message is played first step is to store the telephone number of the concerned person.9. To store the telephone number press the off hook switch SW2. Dial the telephone number by the keypad. 10. By doing that the green LED on the PCB will be glowing showing that the telephone number has been dialed.11. Wait for 5 to 6 seconds after dialing out the telephone number then take off the hand from the off hook switch means that your number has been stored.12. After that obstruct the beam created between infrared receiver (RX) & transmitter (TX) immediately after that you hear the alarming message (chor chor ….) through the speaker.13. At the same time it will dial out the telephone number which has been stored.14. You can hear the same alarming message through telephone line for 30 seconds. 15. The message will be stopped for 30 seconds & again after 30 seconds you can hear the same message through telephone line till no one is resetting the circuit.

FDD.,HDD AND PRINTER FAULT DIAGONOSTIC CARDS

FDD.,HDD AND PRINTER FAULT DIAGONOSTIC CARDS
These three cards have all the bufferd signals out put, connected to leds for monitoring all the control and data signals from pc to above devices and from above devices to pc .Simultaneously you can also monitor these signals on scope. comes with power supply and all the required cables with complete documentation.

HOME/ OFFICE SECURITY SYSTEM (8051 BASED)

HOME/ OFFICE SECURITY SYSTEM (8051 BASED)
SECURTY IS A MATTER OF GREAT CONCERN TO ALL OF US IN THIS WORLD. NORMALLY THERE ARE FOUR TYPES OF SECURITY THREAT TO OUR PROPERTY. 1 )FROM THIEF, AN INTURDER. 2) FROM FIRE, SO WE USE FIRE SENSOR.3) WATER SPILAGE /OVER FLOW, SO WE USE WATER SENSOR. 4) GAS LEAK , WE USE GAS SENSOR, WHEN EVER THERE IS SECURITY BREACH FROM ONE OF ABOVE OR ANY COMBINATION OF ABOVE. THE PROJECT TAKES THE FOLLOWING ACTION .1) SOUNDS AN SIRON TO ATTRACT YOUR OR PUBLIC ATTENTION . 2) IF THE RESET SW IS NOT PRESSED WITHIN 30 SECONDS THE PROJECTS TAKES FURTHER ACTION, IT DIALS OUT PRESTORED NUMBER AND DELIVERS AN EMERGENCY MESSAGE STORED IN SPEECH IC. THE DIALING OUT CONTINEWS TILL A PERSON COMES AND PRESS THE RESET SW MAKING THIS SYSTEM FOOL PROOF. YOU CAN EVEN STORE YOUR MOBILE PHONE NUMBER. THE PROJECT PRESENTED HERE IS BASED ON WORLD’S MOST POWERFUL INTEL’S MCS-51 FAMILY OF MICROCONTROLLER ATMEL AT89C51. OPERATION: AFTER THE USER START THE SYSTEM BY PRESSING SW1 TO SWITCHON THE SYSTEM. SYSTEM START MONOTORING ALL FOUR SENSORS. PORT0.0 TO PORT0.3 THESE FOUR LINES ARE CONNECTED WITH OUR FOUR SENSORS. WHENEVER ANY SENSOR GET ACTUATED THE PERTICULAR PIN WILL BECOME LOW AND FOLLOWING WILL HEPPEN:- 1)P2.7 WILL GO HIGH ,TRANSISTER T3 WILL BECOME ON AND RELAY RL2 WILL SWITCH ON 12V POWER FOR SOUND SECTION. 2)P2.6 WILL BECOME HIGH AND M1 ON API8208 WILL BECOME HIGH SIRON WILL BE PLAYED THROUGH SPEAKER FOR THIRTY SECONDS. 3) IF THE USER DO NOT PRESS SW2 RST SWITCH BEFORE THIRTY SECONDS 4) P2.6 WILL BECOME LOW AND THE SIRON WILL STOP. 5) P2.5 WILL BECOME HIGH AND EMERGENCY MESSAGE WILL START SINCE M2 WILL BECOME HIGH. 6) P2.0 WILL BECOME HIGH AND OFF- HOOK RELAY WILL OPERATE THROUGH TRANSISTER T1 BC 548. THIS IS EQUIVALENT TO LIFTING THE HANDSET FROM THE RECEIVER. 7) AFTER 5 SECONDS P2.4 WILL BECOME HIGH AND TRANSISTER T2 WILL BECOME ON GIVING TWO SECOND DIAL PULSE ON THE TELEPHONE CIRCUIT ON THE REDIAL POINT 8) PRESTORED NUMBER WILL BE DIALED OUT. WHEN THE RECEIVER LIFTS THE HAND SET HE WILL GET THE EMERGENCY MESSAGE. THE MESSAGE WILL BE PLAYED FOR 30 SECONDS AND IT WILL STOP 9) OFF HOOK RELAY WILL DE-ENERGISE. 10) RELAY RL2 WILL BECOME OFF 11) THE PROCESS 1 TO 10 WILL BE REPETED UNTILL RESET IS PRESSED SENSORS: A)SMOKE SENSOR IS BASED ON OPTOMETRIC PRINCIPLE WHEN NO SMOKE IS PRESENT CLEAR LIGHT FALLS ON LDR ITS RESISTANCE REMAINS LOW AND TRANSISTER REMAINS IN CUTOFF STATE. COLLECTOR REMAINS HIGH.WHEN SMOKE IS PRESENT LIGHT GET OBSTRUCTED BY SMOKE RESULTING INCREASE IN LDR RESISTANCE TRANSISTER GETS ENOUGH CONDUCTING VOLTAGE AT ITS BASE AND BECOMES ON ,COLLECTOR VOLTAGE DROPS TO LOW IS AN INPUT TO MICROCONTROLLER PORT PINS. SENSITIVITY CAN BE ADJUSTED USING VR1 VARIABLE REGISTER. B) WATER SENSOR :-WHEN BOTH PROBES ARE EMMERSED IN WATER BASE GET ITS BIASING VOLTAGE THROUGH WATER AND TRANSISTER CONDUCTS, MAKING COLLECTOR LOW C) STRONG IR TRANSMITTER AND RECEIVER IS USED AS INTURDER SENSOR .AN IR INVISIBLE 36KHZ S BEAM IS SUFFICIENTLY AMPLIFIED IN TX MODULE WHEN THE RECEIVER CONTINEUSLY RECEIVE IR BEAM ITS OUT PUT IS HIGH. WHENEVER THIS BEAM IS OBSTRUCTED A LOW PULSE IS OUTPUT & IS CONNECTED TO MICROCONTROLLER SENSOR INPUT PIN . IR RANGE IS 15 TO 20 FEET. D) GAS SENSOR 'S ELECTRONIG CIRCUITORY GIVES LOW OUT PUT WHENEVER GAS IS DETECTED.