hi i have got IR led transmitter and IR led receiver. I got to make it use for person counter. The catch is I should not use 555 timer for modulation. I tried the following circuit but its not working for me.
http://www.ikalogic.com/ir_prox_sensors.php
Can anyone give me a simple design?
thank you
I tried the following circuit but its not working for me.
Can you explain what was not working. Was it the circuit or was the circuit working but the results were not good enough.
Where is the arduino in all this?
The catch is I should not use 555 timer for modulation.
This makes it sound like a school assignment?
Why do you want to modulate the IR, that circuit you posted doesn't modulate. Do you want transmitted (beam breaking) or reflective like that in the circuit you posted.
I want a beam braking circuit. Its stupid of me to go for a circuit which is reflective. am terribly sorry. I want this circuit to be used for counting the number of persons. Ofcourse its a school assignment and am not supposed to use 555 timer and microcontroller. for counting i wil use counters. help me out.
thank you
The circuit that you built is designed for proximity detection. It doesn't really make sense for what you're trying to do. So, to clarify, you're not supposed to use a 555 timer or a microcontroller? If that's the case, then the Arduino is definitely out of the question. What do you mean you'll use "counters" for counting?
Using a circuit based on reflection is going to run you into a lot of problems. What are you reflecting off of? Did you plan to reflect on something on the other side of a doorway or the person walking through? If you're reflecting on the person walking through, then you deal with the possibility of the person wearing something that will absorb all the IR light.
I'd recommend you put your IR transmitter on one end and your receiver on the other, and watch for the break. maybe you can have a capacitor discharge when the beam breaks giving you a solid point of contact...
Additionally, I think you'll find most people here are adverse to doing school assignments. It's not that we don't mind helping, it's usually that we get people who want us to do all the work: "Hey I have to solve this problem, how do I do it?" It's a bit offensive to us that someone does so little and wants success. If you pass this class, what good is it to you if you didn't learn anything? On the other hand, if you are having trouble solving a specific problem such as "Why didn't this work?" or "I'm looking for ideas on how to...." people will be much more inclined to help you out. The suggestions I laid out above are ideas, but you still have to do the design work to make a functional circuit.
If you just want a solution, you'll likely get little help here.
@sicastor. see actually my problem statement goes like this. There will be a conveyor belt rotating at 10 rpm speed. i wil have 3 coins of diameter 2,4 and 6 cms and their values are 1,2 and 3 respectively. now these coins of various numbers wil be placed in the belt. i got to show the value of these coins in the 7 segment display without using a microcontroller and 555 timer. these coins are made of wood. now i got two ideas first is i wil use a schmitt trigger for generating a square wave and use pulse width modulation to generate 40 khz and in the receiver side i wil have tsop receiver. the next idea is to use a laser and ldr. which wil be the best?the next step wat i wil do is give this output as clock to the flipflops(i wil realise a counter using flipflops) and finally give it to 7 segment.
sorry if my way of asking is bad. i don wanna get the whole solution as am a beginner am stuck at various points..also thanks for your advice.