An IR led transmits an encoded bit pattern which is modulated at 38Khz and is decoded at the reciever end using TSOP1838 on LPC2148.
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IR led generates different bit pattern corresponding to a particular switch.
Switch 1 - 1010
Switch 2- 1110
Switch 3- 1100
Logic 0 - A pulse burst of 0.7msec followed by 0.3msec space. Symbol size = 1msec
Logic 1 - A pulse burst of 0.7msec followed by 1.3msec space. Symbol size = 2msec
Upload_transmitter.ctransmitter codeC Source File - 3.79 kB - 11/26/2018 at 09:40 |
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Upload_receiver.creciever codeC Source File - 1.52 kB - 11/26/2018 at 09:40 |
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pattern detection using IR(transmitter).schschematic of transmittersch - 578.58 kB - 11/26/2018 at 06:42 |
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pattern detection using IR(reciever).schschematic of recieversch - 240.16 kB - 11/26/2018 at 06:41 |
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The transmitter side has been successfully implemented. We are able to modulate the IR led at 38Khz and are able to encode a particular bit pattern which is also received by the receiver TSOP1838. The images taken on the DSO for different bit patterns have been attached. We are able to perform required functionality for one pattern however we are still working on how to distinguish the different patterns of decoded output of the receiver.
Pragya Choudhary
morgan
Julian Labuschagne
Dave's Dev Lab
mpinner