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IR remote range: modulated vs. non modulated?

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Propaganda

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Has anyone experimented with data transfer using IR being modulated and non modulated?

Basically, I am just curious to see the range difference indoors with a sun flooded room vs. indoors at night using a non mod and a mod signals at a low baud.

I am about to order IR modules, LEDs, and a modulator and I would like to compare my findings with others.

ty

*edit*

Also, any suggestions on how to format the packet? (MCU to MCU communication) (5 byte payloads)

data1, data2, data3, data4, data5, checksum (of data1 through data5)

example: 1, 1, 1, 1, 1, 5

With RF communication a preamble is a must, but with IR?

ty again
 
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Modulation doesn't affect range, it's primarily for noise rejection (mostly ambient light).

Manchester Encoding works great, the Sony format is also very popular with dozens of uC examples on the net.
 
Modulation doesn't affect range, it's primarily for noise rejection (mostly ambient light).

Manchester Encoding works great, the Sony format is also very popular with dozens of uC examples on the net.
actually it does effect range in as much as you do not have to overpower past nearly as much...that old signal to noise ratio thing does improve range as well.

the other thing it is good for is selectivity to use multiple channels

dan
 
Modulation doesn't affect range, it's primarily for noise rejection (mostly ambient light)....

Have you ever compared the range of a DC-coupled IR beam-break detector vs one that modulates (pulses) the emitter and uses a tuned high-gain AC-coupled gain block in the receiver? The range difference is like several cm vs several meters. That's why I have used a pulsed emitter and one of the TV remote receivers for a beam-break detector that is used in sunlight.
 
Light doesn't travel a different distance based on how you turn it on or off. Functionally does a circuit function better and more reliably with modulation, absolutely.
 
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