InfraRed transmitter how-to

[Raptor0102]

Hi guys, I'm Very new at Electronics and Electronics circuits.
I'm trying to create a Matrix with high power InfraRed transmitter.
I have two issues:

1) How to calculate the wave-length I need to my InfraRed transmitter While I know the this:

"Each pulse is turned on and off at a frequency of 38kHz"

2) How to choose a high power InfraRed transmitter, I have seen many types, My needs are:


a) Same wave-length as I will caculate from the frequency.
b) I need a transmitter that can transmite to long distance as much as he can.
c) I don't mind to spend 15$ for one transmitter as long its good!
For example:

Power: 10W
Voltage:4.5-5.5V
Current: 900-1200mA
Angle :125 degrees
The radiation power: 900-1000MW
Working temperature: -20 degrees ---+70 degrees
Storage temperature: -20 degrees ---+80 degrees


Or:


5W high-power Infra-red
Wavelength :940nm
Forward Voltage:1.8-2.4v
Forward Current: 1000mA
Lens Color : Water Clear
Viewing Angle: 120-140°

Which one is better?Thanks!!

 

[Warpspeed]

You will need to match the transmitter IR wavelength to the receiver IR wavelength.
The wavelength itself is not important, but having both ends of the system working together at the same wavelength is VERY important.

How often you pulse it on and off has nothing to do with the wavelength.
But again, the receiver must be tuned to the exact same pulsing frequency as the transmitter.

Power is a lot less important than the optics.
Something highly directional and focused with a lens or a mirror will go a lot further than just connecting up a wide angle transmitter to a wide angle receiver.

 

[Raptor0102]

You will need to match the transmitter IR wavelength to the receiver IR wavelength.
The wavelength itself is not important, but having both ends of the system working together at the same wavelength is VERY important.

How often you pulse it on and off has nothing to do with the wavelength.
But again, the receiver must be tuned to the exact same pulsing frequency as the transmitter.

Power is a lot less important than the optics.
Something highly directional and focused with a lens or a mirror will go a lot further than just connecting up a wide angle transmitter to a wide angle receiver.

Thanks, So what infraRed do you recommend?

 

[Raptor0102]

Hi,

38kHz sounds like remote control.

Do you want to use it like this or similar?

What´s the use of it?

Klaus

Yes!! I want to replace the remote control of quadCopter in my InfraRed.

 

[Raptor0102]

Hi,

38kHz sounds like remote control.

Do you want to use it like this or similar?

What´s the use of it?

Klaus

- - - Updated - - -

Hi,

then you need to transmit "data" with your IR. So it is not simply 38kHz but "modulated 38kHz".

Are you aware of that?
***

Be sure not to overdrive your IR receiver with your huge IR power.

Klaus

Thanks, What do you mean "modulated 38kHz"? How can I know the wave-length? I have searched and I think its 940nm, but I'm not sure.
What IR transmitter Do you recommend?

 

[KlausST]

Hi,

38kHz sounds like remote control.

Do you want to use it like this or similar?

What´s the use of it?

Klaus

- - - Updated - - -

Hi,

then you need to transmit "data" with your IR. So it is not simply 38kHz but "modulated 38kHz".

Are you aware of that?
***

Be sure not to overdrive your IR receiver with your huge IR power.

Klaus

- - - Updated - - -

ADDED:

***Sorry for the confusion with the mixed up order of posts....********


940nm is the wavelength of the light. It defines the "color" of the light. Although it is not visible for human eyes.

38kHz is the modulation frequency. It is used for the receiver to recognize the IR light as remote control signal. it differs form DC = ambient IR light. And it differs from other IR remot control frequencies.

But you need to transmit data. You want to control the quadcopter. Up, down, right, left... are informations (=data) to be transmitted.
Therefore the 38kHz IR is switched ON/OFF with a defined timing. The ON/OFF code says: Up, down....

For a working remote control you need:
* the correct wavelength
* the correct modulation frequency
* and the correct code.

Klaus