Timeline for Help identifying modulation scheme
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Jun 11, 2020 at 15:10 | history | edited | CommunityBot |
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| Nov 7, 2019 at 2:30 | history | edited | Voltage Spike♦ |
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| Feb 21, 2016 at 22:18 | history | tweeted | twitter.com/StackElectronix/status/701531379243294724 | ||
| Feb 21, 2016 at 17:03 | answer | added | jms | timeline score: 4 | |
| Feb 21, 2016 at 16:56 | comment | added | Robherc KV5ROB | I see at least 56 'pulse periods' between the first an last 'pulse blocks' on your graph. Are you sure that it's transmitting those 24 bits of data you listed in a non-encrypted format? It would be really eash for me to believe that I'm looking at a crypto hash output there. | |
| Feb 21, 2016 at 15:27 | comment | added | user3780104 | Hi. The period for the whole signal is 1.5ms, and the width of the smallest pulse is 25us.. The graph period is 50us. Arduino it lib won't work as it's too fast. It isn't consumer ir. The device is an identification transponder | |
| Feb 21, 2016 at 14:46 | comment | added | Bimpelrekkie | Do you have an Arduino and an infrered receiver lying around ? If so load one of the Demos of the IRLib library and it might tell you what coding is used. | |
| Feb 21, 2016 at 13:57 | comment | added | jms | What is the timebase of the scope? What device produces these? How do you know the data being transmitted without understanding the protocol? It can't be bi-phase (manchester) coded as there are pauses and pulses longer than 2 periods, which also rules out the common RC-5 remote control protocol. It isn't Sony's SIRC or the NEC protocol either, as pulse length modulation is clearly not being used. It's not the plain binary data either. Maybe this can help: vishay.com/docs/80071/dataform.pdf | |
| Feb 21, 2016 at 13:33 | history | asked | user3780104 | CC BY-SA 3.0 |