BillRange
Joined: 17 Jun 2006
Posts: 3
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 22 Jul 2006 18:02 Re: technique about wireless infrared comunication request |
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| tags: lm567 38khz |
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-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
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