Infrared Photodiode Sensor Circuits

[Leon.h]

Hello,

I was wondering if anyone of the experts can give me advice on the above.

I need to trigger a counter when a beam of IR light is cut, using a photodiode & phototransistor. The timer circuit is done, I would appreciate any help.

Thanks.

 

[Russlk]

You need an IR receiver, such as this: https://www.vishay.com/ir-receiver-modules/

 

[Leon.h]

Cheers Russlk, but.......

Got all the components, using a NE555 timer, IR LED's, IR phototransistor etc but its the actual wiring up of the system I am unsure of.

As the beam of light is cut, I want the red LED I am using in the detector, to go out & trigger a timing device, how exactly would I go about this?

 

[Russlk]

Try this:

 

[daviddoria]

russlk, with the voltage divider like that on pins 6 and 7 isn't that astable mode? wouldn't he want monostable and pin 3 (output) connected to the 7-seg display controller?

i could be wrong...

 

[Russlk]

No, I did not show the output connection. Astable mode is when pin 2 and 6 are connected. The pulse width is very short when pin6 and 7 are connected, this arrangement widens the pulse width.

 

[daviddoria]

ahh yes 2 and 6 are indeed not connected

what do you mean the pulse width?

 

[Russlk]

Good question, I was confused; should refer to the data sheet more often.

 

[alvin_lee]

Need circuit in Tx and Rx data through InfraRed

Hi everyone,
I have a problem here. I am currently working on a project. It requires me to transmit data from one end to the other using Infra-Red. I've got a 38kHz signal generated using a 555 timer, an IR diode and a receiving module IS1U60. From what i understand, the IS1U60 should allow me to get a High output when theres no signal received and a Low signal where theres a 38kHz waveform. I tried to transmit the 38kHz over to the receiving module but fail to get the desired output as stated. Please help me......its urgent. Thanks

 

[Leon.h]

Thanks!

Thanks for the assistance guys, much appreciated!

 

[Russlk]

Alvin-Lee: Here is a quote from another website:
Sharp IS1U60 (available at RS, it seems that this IC draws much more current than the others)
Warning: Some users have reported problems with the IS1U60 receiver. It picks up ambient light and is nearly unusable with fluorescent lamps. If ever possible get a different receiver.

Check this URL for other receivers:
https://www.lirc.org/receivers.html

However, does your circuit work if you get the transmitting LED close enough? Post your circuit if you want more feedback.

 

[Electric Rain]

Alvin-Lee: Here is a quote from another website:
Sharp IS1U60 (available at RS, it seems that this IC draws much more current than the others)
Warning: Some users have reported problems with the IS1U60 receiver. It picks up ambient light and is nearly unusable with fluorescent lamps. If ever possible get a different receiver.

Check this URL for other receivers:
https://www.lirc.org/receivers.html

However, does your circuit work if you get the transmitting LED close enough? Post your circuit if you want more feedback.

Haha! :lol: That's no surprise. RS selling a junk IC. :lol: They're no good anymore. :x

 

[alvin_lee]

Infra-Red

I cant get anything transmitted even if I get the emitter to touch the receiver. The circuit is pretty simple. I attach one leg of the Infra-Red to a 38khz signal generated from a 555 timer. On the receiving end, I power up IS1U60 and attach a probe on the output. I get a constant high which means the receiver is not receiving any signal at all.

 

[selvasekar]

can any tell how does an ir photodiode sensor work

 

[selvasekar]

iam doing a project on intelligent shopping cart.. my question is how can we detect an products entry or removal

 

[blueroomelectronics]

iam doing a project on intelligent shopping cart.. my question is how can we detect an products entry or removal

That's the hard part. Barcode, weight...