How many IR receivers can I wire in parallel?

Projects General Guidance
61

Hi, @anon77129126

Can I say this?

Now is the time for you to purchase some samples of possible components that you hope to use and GET DOWN AND DIRTY YOUR HANDS AND EXPERIMENT.

YOU need to establish what your components can do in the REAL WORLD.
YOU need to check if the wavelength discrepancies will hinder the response?

YOU need to make a POC (Proof Of Concept) model and play with it.

YOU need to take the next step and see if your ideas work.
Stop over thinking your project and experiment and find out if your basic concept, for a start, will work.

Thanks.. Tom.. :smiley: :+1: :coffee: :australia:

1 Like
62

Yes. If You can't design, calculate electronics, trial and error can be used. Verify the function for 1 sensor. Then try 2.....

63

I have Aliexpress open in the tab to the left of this one!

64

I saw the max output listed at 5ma. So to get the max out I assumed 3.3v and 4ma. There is no data to predict Vcesat but I assumed getting below the 1 volt for a 3.3v Arduino is doable.

65

Found a laser diode and IR receivers.

Receivers
Laser

66

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These are what I use.

Use the IR library to modulate at 38kHz while sending data, when used with TSOP4838s.

67

I like the one I found firstly because it's an IR laser and will be picked up by the TSOP better and second because it has an ACC driver integrated, which means that the pesky amperage regulation is done on board.

EDIT - I didn't know copper was a plastic.

68

Chinese translation :thinking:

1 Like
69

Where should I get laser glasses? I don't trust Aliexpress with my eyeballs.

EDIT - I looked at a place called "Laserland" and they seem alright.

70

I'm going to mark this as solved for now. I think I know what to do, but there's only one way to find out.

Thanks for your help!

1 Like
71

The lens options are interesting.

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72

I think it comes with just a circular lens.

73

A broad lens pattern makes it easier to hit the target TSOP. :wink:

74

The laser is going to be diffused in front of the TSOP. Also, beam divergence.

I think it'll be fine.

75

Thanks. 70 posts needed....

76

No.

Acrylic blocks IR light, that is why you can cut acrylic with a CO2 IR laser.

77

CO2 lasers and ir laser diodes are at substantially different wavelengths, aren’t they? (Approx 10um vs 1um…)

78

Should I use glass?

79

Experiment. Now. You make it harder with IR because you can't see it. Start with red so you can see what the beam is doing. I think you will find that the dispersion idea is a canard.

80

Time to buy glass.

My thought is that if glass can focus and refract IR light as well as reflect it, it will be able to diffuse it too.

By the way I already tried with frosted acrylic and a laser pointer and it worked great.

EDIT - Can't find anyone who sells glass...