Hiii…….friends today I am here with a very interesting projects for those who have just started with electronics. With this project we can display 0-9 digits on the 7 segment and we can count the no of persons entering in a room.
Circuit Diagram
Here a counter IC 7490 is used along with BCD to 7 segment decoder IC 7447. The function of 7490 is to provide the counting value and decoder IC is decoding that value to 7 segment output . Every time when you will push the switch the clock of IC7490 will be triggered and as a result count will increase by 1 . Hence with this simple project we can display numbers 0 to 9 on seven segment display just by pressing switch. It’s a very easy circuit and you can easily implement it on a general purpose PCB.
NOW ITS TIME TO MAKE USE OF THIS CIRCUIT IN COUNTING THE NUMBER OF PERSONS ENTERING IN THE ROOM...... LETS SEE HOW….??
So instead of using switch we will use LDR here , we will place LDR at the entry door in such a manner that the shadow of the entering person should fall directly on LDR , when shadow will fall on LDR clock of IC 7490 will be triggered and as a result the count will increase by one. Circuit wilh some small changes is as shown. Variable resistor is used to adjust the resistance to synchronize the light intensity for better results.
COMPONENT REQUIRED
U2 IC 7447
R1-R7 RESISTORS 330R x7
SEVEN SEGMENT DISPLAY( common anode)
Push button
POWER SUPPLY ( 5 to9 V)
LDR and VARIABLE RESISTOR
I hope it was a interesting project and u can use it as your school project or mini project as well. In case of any doubt, question or critical view just leave a comment.
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