frequency of IR reciever

[Bhuvanesh123]

i am working on arduino.My remote control works on 40khz and it send 12 bit of information.So does 40khz mean i can send (approx)40000 bit per second,am i right or wrong.Thank you in advance

 

[jayanth.devarayanadurga]

IR data is sent as bursts. If you take SIRC (Sony IR code) then it has 13 bits including start bit. 1 start bit + 7 command bits + 5 address bits. Both bit 1 and 0 are send as IR bursts. The carrier frequency is 40 KHz. If bit 1 means high for 1.2 ms OFF for 600 us then a burst of 1.2 ms is sent and a silence remains for 600 us. If logic 0 means 600 us high and 600 us low then a burst of 600 us is sent and a silence remains for 600 us. For start bit 2.4 ms burst and 600 us silence is sent. bursts are all logic high of 40 KHz frequency. It might also be 36 or 38 KHz.

 

[jayanth.devarayanadurga]

Read this page.

https://www.sbprojects.com/knowledge/ir/sirc.php

 

[Bhuvanesh123]

yes,we modulating the signal.Right.i have an obscure vision on mudulation ever since i heard that term.Actually,instead of on IR light for certain time to indicate one.we are on and off the IR light.MY question is for ON it should blink for 600us means,how many clyces on and off ,does it take for 38khz .does it take completely 38 cyles for one on and off.please explain me.Thank you