technique about wireless infrared comunication request

[AlexNg]

ne555 38khz

Is anyone know about twchnique how to trasfer data from infrared sensor transmitter to infrared sensor receiver?

 

[electronrancher]

at89s51 application circuit

don't they use a 35kHz carrier? you should google for the answer, this is a very old and well-documented system.

 

[BillRange]

38khz lm567

-Sending methods:
1. Using NE555 to modulate 38KHz signal;
2. Using CMOS IC or TTL circuits to create 38KHz signal, eg. not gate CD4096;
3. Using MicroComputer such as AT89S51 to create 38KHz sigal;
4. Using professional IC to create 38KHz signal, such as TV remote device IC;
-Application Note:
1. Using professional IC communications distance can reach to 7-10m, the distance of
NE555, AT89S51 or CMOS IC is much less than professional IC;

-Receiving methods:
1. Using LM567/NE567 to demodulate 38KHz signal;
2. Using 38KHz filter and CMOS circuits to get 38KHz signal;
3. Using LC filter to get 38KHz signal;
4. Using professional IR receiving header such as TSOP1738 to get 38kHz signals;
-Application Note:
1. You can use LC circuits or COMS/TTL circuits to amplifer siganls to increase
receiving distance;
2. The most common solution is using professional IR receiving header, for it is
integrated IC, it can generates 0/1 signal without other outside components;
3. Generally when using Microcontrol to decode signals generating by profession IR
sending IC, the length of high denotes 0/1 signal and low level divides data bits;

-Create Nets:
1. Using encoder/decoder IC, Such as VD5026/VD5027 or PT2262/PT2272. VD5026/PT2262
encodes addresses and datas and VD5027/PT2272 decodes addresses and datas;
2. Using Microcomputers such as AT89S51 to encode addresses and datas and AT89S51 to
decodes addressed and datas;
-Application Note:
1. If using Microcomputers such as AT89S51, u should use mul-machines mode namely
SM2=1 and order communciation protocol, such as Address_Datas_CheckSum format;

BillRange
2006.7.22