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Versatile Object Counter |
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 Fig. 1: Object counter circuit |
The NE555 timer (IC1) is configured as a monostable multi-vibrator that generates a pulse of 330ms duration. This monostable output is given as clock to dual up-counter CD4518 (IC2). IC2 increments on every positive edge of the clock, giving a BCD output on pins 3 to 6. The purpose of NE555 timer is to prevent signal debouncing from transistor T2. NE555 timer gives a perfect clock pulse.
 Fig. 2: Expansion circuit |
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Nice project.
plz tell me the value of resistors which are used with seven segment display
You can calculate it yourself. Depending on display color you have different Vf for each segment you can look up in the datasheet.R5V-VfIfe.g. for a red display 5V-1.6V20mA 170ohms next E12 value is 180 ohms.
u can directly connect or use 470 ohms
Thats an apt answer to an iternetsing question
is it necessary to connect expansion circuit
It is not Neccesay....It is just in case if you need to count more than 9I mean You cant Count More than 0-9 without Expansion circuit
can connect E2 directly to same 555 opif its connect same op will display in expansion 7 segment ?
how is the transistor BC547 acting as a switch
Siri am monthly subscriber of this megzine...plz send me pcb layout of versatile object counter...
can i have applications of this project
very nice project thanx efy
is that circuit will run if I use LF4G1 photo transistor?
without using li4fi can we use photodiode ir receiver tsop 1133
can any one mail me or post the pcb design for this circuit
Can u please give the value of resistors attached to seven segment display
any one send a report to this projects...
did u get the report for this project? i need it too as reference. need help with understanding the exact working of the circuit.
u calculate output of the IC3 and put the resistance value depends upon the 7 segment display..
use 150 ohm resister...
one sensor and counter s to this work..for what this project was used... any reason to take this circuit...
hey ir beam which i connected is nt emitting any thing.der is no vtg showin across the polarities of the beam.the number doesnt changes as i move the object between the beam nd the phototransistor
The IC 4518 is CMOS while the rest are TTL. To reset the display from 9 to 0 the AND gate must send a HIGH signal to the Reset Pin of the 4518 IC. However since the AND is TTL and the counter is CMOS it does not drive the expansion circuit. I faced this problem while implementing this project. I used the TTL IC 7493 - counter - to solve this problem. 7490 is also another option.