255键红外学习模块，包含原理与协议。可以学习不同载波频率的红外码。-255 key IR learning module, which contains the principles and agreements. You can learn the infrared codes of different carrier frequency.

c51红外线的应用源代码，写的很好！大家可以借鉴一下，共同学习-c51 infrared application source code, very well written! We can learn, learning together