8081 BASED TOKEN NUMBER DISPLAY

This projects not only displays the token number but also announce the number of the called party. Token number is displayed on three seven segment display. An emergency foot switch is provided, which can be operated by the cashier incase of looting or any other similar reason, the siren will start.An autodialer can be added with additional cost add rs. 1000/- to the project cost for auto dialer function.

SIX CHANNEL PETROCHEMICAL FIRE MONITORING AND CONTROL STATION

SIX CHANNEL PETROCHEMICAL FIRE MONITORING AND CONTROL STATION
MODERN PETROCHEMICAL PLANTS ARE ALWAYS AT THE RISK OF FIRE SINCE LOT OF TOXIN INFLAMMABLE GASES ARE OFTEN PRESENT ALSO THE TEMPERATURE IS ALSO HIGH . THESE ARE NORMALLY UMS CLASS (UNMANNED MACHIONERY SPACE) SUPERVISORY ROOMS ARE ALWAYS AWAY FROM THE ACTUAL PLANTS. ALL LIGHT FIXURES ARE EXPLOSION PROOF. LITTLE SPARK CAN CAUSE GREAT FIRE. NORMAL FIRE SENSORS CAN NOT BE UTILISED THERE. SPECIALLY DESIGNED SENSORS ARE USED THERE TO SENCE SMOKE. IN CASE IF ANY SENSOR SENSES SMOKE THE FOLLOWING ACTION WILL TAKE PLACE Start the fire alarm or siren. Shut down the plant. Start sprinkling . 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. THIS PROJECT IS BASED ON 8051 MICROCONTROLLER. OPERATION: CONNECT THE TELEPHONE LINE TO TEL IN CONNECTOR THERE SHOULD BE 50V TO 54 VOLTS AT THE TEL CONNECTOR, CONFIRMS THE PROPER TELEPHONE CONNECTION. NOW PLUG IN THE POWER CONNECTOR TO 250V MAINS. ALL LEDS WILL BLINK.INDICATES STANDBY MODE. PRESS ON /OFF SWITCH (SW3) BLINKING WILL STOP AND PLANT ON RELAY WILL BE ON AND PLANT ON INDICATION WILL BE ON.2. PRESS SW1, OFF-HOOK RELAY WILL BECOME ON. THIS IS EQUILVALENT TO LIFTING THE HANDSET OF THE TELEPHONE. AND NOW YOU CAN STORE THE TELEPHONE NUMBER THROUGH THE DIALER KEY PAD. DIAL ANY NUMBER OTHER THAN THE LINE CONNECTED TO THIS DEVICE.IT CAN BE YOUR MOBILE NUMBER. YOU WILL RECEIVE THE BELL ON THE CALLED NUMBER. AFTER HEARING TWO THREE BELLS.PRESS SW1 AGAIN. THIS WILL STOP REINING.EQUIVALENT TO PUTTING THE RECEIVER BACK.NOW THE DEVICE IS READY TO MONITOR THE FIRE SENSORS. ONLY TWO SENSORS ARE PROVIDED WITH THE PROJECT. OUT PUT CAN BE CONNECTED TO ANY CHANNEL TO SHOW THE DEMONSTRATION. YOU CAN BLOW BLACK SMOKE THROUGH THE SENSORS USING AGGARBATTI OR CIGERATE BLOWING. SENSITIVITY OF THE SENSORS CAN BE ADJUSTED BY TURNING THE SCREW TO SLIGHTLY CLOCKWISE . FITTED INSIDE THE SMOKE SENSOR BOTTOM SIDE YOU WILL HAVE TO OPEN THE BOTTOM PLATE OF THE SENSOR TO DO THIS SAME WAY OVERSENSIVITY WILL CAUSE FALSE ALARM ,SO TURN IT SLIGHTLY ANTICLOCKWISE. HOWEVER WE ADJUST EVERY THING BEFORE SHIPMENT. SUPPOSE YOU BLOW SMOKE THROUGH THE SMOKE SENSOR AND IT GET TRIGGERD YOU WILL HEAR SIRON SOUND AND THE RESPECTIVE LED GLOWING AND EMERGENCY LED BLINKING. IF THE RESET SW2 IS NOT PRESSED WITHIN THIRTY SECON. THE DEVICE WILL TAKE FURTHER ACTION AFTER THIRTY SECOND THE PLANT RELAY WILL BE OFF AND SPRINKLE TLAY WILL BECOME ON THE DEVICE WILL DIAL UP THE TELEPHON NUMBER AND EMERGENCY MESSAGE. THIS PROCESS OF DIALING AND REPETED MESSAGE WILL CONTINUE TILL YOU RESET THE RESET (SW2)

Eight Channel Telephone (G.S.M) Controlled Switch With Voice

TELEPHONE CONTROL SWITCH WITH VOICE

( GSM CONTROLL SWITCH) USING MOBILE PHONE

THE SAID PROJECT IS DESIGNED ON THE PRINCIPAL OF DTMF DECODING.OUR MODERN TELEPHONE AND EVEN OUR MOBILE PHONE USES DTMF CODING FOR NUMBER DIALING. THESE DTMF CODES CAN BE DECODED AND UTILISED FOR USEFUL PURPOSES. THE CIRCUIT UTILISES IC8870 FOR DTMF DECODING . MICROCONTROLLER 89C51 READS THESE CODES AND TAKES THE NECESSARY ACTION.

CIRCUIT DESCRIPTION: TELEPHONE LINE IS CONNECTED AT CONNECTOR K1. WHENEVER SOMEONE CALLS THIS NUMBER, THAT TIME TELEPHONE LINE CARRIES ABOUT 70V RINGING SIGNAL SIGNAL IS RECTIFIED BY THE BRIDGE D5-D8 AND FILTERED BY C4, R20, AND D9 AND DRIVES AN OPTO COUPLER IC U8 MCT2E . COLLECTOR OF THE OPTOCOUPLER WILL GO LOW WHENEVER BELL RINGS. SINCE THE COLLECTOR IS CONNECTED TO P2.7 OF MICROCONTROLLER 89C51. NUMBER OF TIMES IT GOES LOW IS COUNTED BY MICROCONTROLLER. AFTER SIX TO EIGHT RINGS,P1.0 WILL GO HIGH AND SWITCH ON TRANSISTER T4 AND ENERGISE THE OFF HOOK RELAY RL1 . THE CONTECTS OF RELAY RL 1 WILL BECOME CLOSED AND THE TELEPHONE LINE WILL GET CONNECTED TO DTMF DECODER IC 8870, THROUGH C7 AND C8. RESISTANCE R8 COMES ACROSS THE TELEPHONE LINE AND THAT LOWERS THE VOLTAGE,AND THIS ULTIMATELY SENDS MESSAGES TO EXCHANGE THE USER HAS LIFTED THE HAND SET. AT THE SAME TIME ,MICROCONTROLLER PIN P3.5 WILL TRIGGER THE VOICE IC API8208 WHERE ALL THE MESSAGES ARE STORED. CALLER WILL GET THE MESSAGE”PLEASE INTER THE PASSWARD”THE DEFAULT PASSWORD IS 1-2-3-4. WHEN CALLER ENTERS THIS 4 DIGIT PASSWORD. IC 8870 DECODES THESE NUMBERS AND BINARY NUMEBRS ARE AVAILABLE AT Q1 TO Q4 ,PIN NO 11-14 OF DTMF DECODER WHENEVER NEW CODE COMES PIN NO 15( STB) OF DTMF DECODER WILL PULSE LOW, AND IS CONNECTED TO P1.1 INFORMING MICROCONTROLLER THAT CODES ARE AVAILABLE PLEASE TAKE THEM . MICROCONTROLLER WILL READS THESE CODES ONE BY ONE, THROUGH ITS LINE P1.2-P1.5. IF THE CODES MATCHES WITH THE CODES INSIDE THE MICROCONTROLLER, MICROCONTROLLER WILL SEND MESSAGE “ PLEASE ENTER CHANNEL NUMBER”. IF THE PASSWARD ENTERED IS NOT CORRECT. MICROCONTROLLER WILL DISCONNECT THE TELEPHONE LINE WITHOUT ANY REPLY, BY MAKING P1.0 LOW.

IF THE PASSWORD ENTERED IS CORRECT. YOU WILL GET MESSAGE “PLEASE ENTER CHANNEL NUMBER” NOW YOU HAVE TWO CHOICES

1. YOU CAN GO TO NORMAL ON /OFF MODE

2. YOU CAN CHANGE YOUR PASSWORD

NORMAL ON/ OFF MODE PRESS STAR AND 1( * & 1) NOT TOGETHER ONE BY ONE AFTER THAT PRESS 1&1 TO SWITCH ON IST RELAY.SIMILARLY

ALL RELAYS CAN BE SWITCHED ON AS FOLLOWS

* & 1 NORMAL ON /OFF MODE

1& 1 TO SWITCH ON IST RELAY

2&1 TO SWITCH ON 2^ND RELAY

7&1 TO SWITCH ON SEVENTH RELAY

9 & 1 TO SWITCH ON ALL RELAYS

EVERY TIME YOU WILL RECEIVE MESSAGE” REQUESTED CHANNEL IS ON “PRESS CHANELL NO AND 0 SAY 1&0 WILL SWITCH OFF IST RELAY,2&0 WILL SWITCH OFF 2^ND RELAY. 9&0 WILL SWITCH OFF ALL RELAYSYOU WILL RECEIVE “REQUESTED CHANNEL IS OFF’ MESSAGE .IF YOU WANT TO KNOW THE STATUS OF THE PREVIOUSLY ON/ OFF RELAYS.PRESS CHANNEL NUMBER AND 2, SAY 2&2 WILL MESSAGE WHEATHER THE CHANNEL IS ON OR OFF .IF YOU WANT TO CHANGE THE PASSWORD FOLLOW THESE STEPS

DIAL THIS NUMBER FROM OTHER LINE AFTER SIX TO EIGHT BELLS YOU WILL RECEIVE MESSAGE ” PLEASE ENTER YOUR PASSWORD”. (1,2,3,4)SO YOU ENTER YOUR PASSWORD AND WAIT FOR THE MESSAGE “ PLEASE ENTER THE CHANNEL NUMBER” NOW1.PRESS * & 2 ( FIRST STAR AND THEN TWO).YOU WILL RECEIVE MESSAGE(“PLEASE ENTER YOUR PASSWORD”.SO YOU MUST ENTER YOUR OLD PASSWORD AGAIN.SAY(1,2,3,4)AFTER THAT YOU WILL RECEIVE MESSAGE ”PLEASE ENTER NEW PASSWORD” SAY YOU ENTERED 4,5,6,7, YOU WILL RECEIVE MESSAGE “YOUR PASSWORD HAS BEEN CHANGED’’ KEEP THE HENDSET BACK ON THE INSTRUMENT FROM WHERE YOU ARE CALLING.NEXT TIME WHEN YOU DIAL ,YOU WILL HAVE TO ENTER YOUR NEW PASSWORD. NEW PASSWORD WILL STAY AS LONG AS POWER IS NOT INTERRUPTED.IF POWER FAILS IT WILL REVERT TO DEFAULT PASSWORD 1,2,3,4,

Microcontrolled ultrasonic distance calculator

A PIC16C84-microcontroller is the mastermind in this project and controls the whole operation. Taking advantageof the PIC16C84's internal EEPROM (electrically erasable programmable read onlymemory), a data store and recall facility have been programmed in as well. There is also a masking option that allows foreground echoes to be ignored.The device can record and recall 30 or 32 distance measurements, allowing several readings to be taken before copying them to paper - ideal when taking measurements in difficult to access locations. when Send switch is pressed, the PIC transmits a series of 40kHz pulses via the ultrasonic transmitting transducer. .operating frequency (4MHz as set by crystal X1) and the number of commands that are processed between each phase of the output signal. Solid objects within the path of this signal reflect it back to the ultrasonic receiving transducer, RX1. These measurements are displayed on the 16-character 2-line LCD (liquid crystal display module). both meters and feets.
The transmission and echo conversion process continues for as long as the Send button remains pressed. You can, therefore, pan around a room and just generally view its dimensions until you are ready to accept a measurement. At this moment, releasing the switch will cause the last measurement read to stay on the LCD screen. It will remain there until Send is pressed again, or Recall switch is pressed, or the unit is switched off.While Send is pressed, the sampling rate is normally a little under once
per second depending on the mask and distance values.