Hi Kiste,
Sometimes I have to push things aside. So is this topic. I have taken up the matter again and on my pin board both the transmitter and the receiver work with a 12F683 at 1200 baud. I did put a 100nF in series at the output according to your diagram. I also put a similar filter in the input of the receiver. Identical to your proposal but because I know absolutely nothing about filter matters I don't know if I did this right. I feed a separate uart signal as input and read out another uart with the receiver. I recorded the signal with audicity and saved it as WAV. When playing back to the receiver I do get responses but there is quite a bit of junk. My question : what should the inlet filter to the receiver look like. I know your box of thanks is already full, but I'll add another one. regards Hans Op zondag 19 juni 2022 om 12:46:36 UTC+2 schreef hans: > Hello all, > I've tried many things, but I always had problems. I have now received a > handful of MT8880 from china and this time they all worked. Even when I > apply this I regularly have malfunctions, but if I repeat every command 3 > times and check then it works. I'm a bit further, only the person I was > working for has unfortunately chosen something else. So this will go in the > "you can't know box" for now. > We continue happily, it remains fun. > regards > Hans > > Op dinsdag 5 april 2022 om 19:57:25 UTC+2 schreef rob...@hotmail.com: > >> Hi Kiste, >> >> Nice solution. Hans has options to select from 🙂. >> >> BTW. @hans. I made as small error in my hardware receiver solution. >> Capacitor C3 should be 2nF (two 1nF in parallel) but if I where you I would >> try Kiste's solution first. If that works you are done. >> >> Kind regards, >> >> Rob >> >> ------------------------------ >> *Van:* 'Oliver Seitz' via jallib <jal...@googlegroups.com> >> *Verzonden:* dinsdag 5 april 2022 19:12 >> >> *Aan:* jal...@googlegroups.com <jal...@googlegroups.com> >> *Onderwerp:* Re: [jallib] PWM serial audio transmission >> I have only made small changes in the code and improved the comments. I >> did not try this version, but I'm quite sure it should work. You only need >> a PIC, a resistor, a TTL-Serial converter with a computer and the sample >> audio file which i posted earlier to see it working. >> >> (You can even omit the resistor, but you could fry the PIC then. >> Especially if you don't use the error LED and have no idea about what >> volume to set) >> >> Greets, >> Kiste >> >> Am Dienstag, 5. April 2022, 12:05:59 MESZ hat hans < >> hansvanve...@gmail.com> Folgendes geschrieben: >> >> >> Hello Rob and Kiste, >> The next days i have a friend who can assist me. So (beside his AC >> project) we might find time to continue with this . So please give us the >> last info. >> Thanks again >> hans >> >> Op zondag 3 april 2022 om 15:57:03 UTC+2 schreef rob...@hotmail.com: >> >> Hi Hans, >> >> I also tried it with a lower frequency, 3330 Hz for the low tone and 4030 >> Hz for the high tone so that the signal is strong enough when you record it. >> >> If you want to know more, let me know. >> >> Kind regards, >> >> Rob >> >> ------------------------------ >> *Van:* jal...@googlegroups.com <jal...@googlegroups.com> namens hans < >> hansvanve...@gmail.com> >> *Verzonden:* zondag 3 april 2022 15:11 >> *Aan:* jallib <jal...@googlegroups.com> >> >> *Onderwerp:* Re: [jallib] PWM serial audio transmission >> Still foggy, just wait a little longer with this case. >> >> Op zaterdag 26 maart 2022 om 20:05:55 UTC+1 schreef rob...@hotmail.com: >> >> Hi Hans, >> >> I hope you are getting well soon. Last update. I recorded the audio and >> played it back to see if it works. >> >> And it seems to work but may need some fine tuning. In this video you see >> the device in operation: https://youtu.be/w-j0ekk975g >> >> The yellow line on the oscilloscope is the audio signal and the blue line >> the trigger signal. This trigger signal is also visible by the Amber LED on >> the top right of the breadboard. >> >> I recorded the low tone (it is a video recording but I am only using the >> audio) and switched from low tone to the high tone frequently. What you see >> is that the signal of the high tone is smaller but it still works. You also >> see that the refresh of the oscilloscope is a bit behind so the LED on the >> breadboard shows the real trigger. I also attached two screenshots. You see >> that the trigger response is quite fast (zoomed in) but with a high tone it >> is not constant (see zoomed out) but that can be solved in software and >> could be because the signal is smaller. Also I noticed that when no signal >> is present the output is also high but that stops as soon as the low tone >> is detected. >> >> So still a proof of concept but seems to do something. I also attached >> the audio tone. Maybe lower tones would be better. >> >> For recording I just used the output of the PIC using a resistor divider >> of 10 k with 100 Ohm and connecting that to the line in of my computer. For >> playback I added an LM358 to amplify the input signal and I used the >> headphone output. >> >> Kind regards, >> >> Rob >> >> >> Op donderdag 24 maart 2022 om 12:47:49 UTC+1 schreef rob...@hotmail.com: >> >> Hi Marieke, >> >> Thanks for the update. Let's hope Hans recovers soon. >> >> Kind regards, >> >> Rob >> >> ------------------------------ >> *Van:* 'Oliver Seitz' via jallib <jal...@googlegroups.com> >> *Verzonden:* donderdag 24 maart 2022 07:37 >> >> *Aan:* jal...@googlegroups.com <jal...@googlegroups.com> >> *Onderwerp:* Re: [jallib] PWM serial audio transmission >> Altijd met Rust... >> >> It took me two weeks to think, code and test, and it will take more weeks >> for proper documentation. So no need for you to hurry ;-) >> >> Greets, >> Kiste >> >> Am Mittwoch, 23. März 2022, 22:36:19 MEZ hat hans <hansvanve...@gmail.com> >> Folgendes geschrieben: >> >> >> Hello everyone, >> >> My grandfather Hans has only one usable eye and has got an infection on >> it. We have read your contributions and he is very happy with them. Sorry >> but he can't work with it right now. >> >> Regards Marieke >> >> Op woensdag 23 maart 2022 om 17:22:42 UTC+1 schreef Kiste: >> >> And here's the receiver, and a sample file. Mp3 does work at 1200baud, >> but you shouldn't use less than 128kbit for encoding. At 80kbit I only got >> garbage. Volume must be reasonably high, slowly turn louder until the error >> LED is constantly off. >> >> Don't send too much data back-to-back, have pauses of like 10 ms every >> second (but keep the tone on all the time) >> >> Don't assume error-free transmission, send data multiple times and check >> when receiving. >> >> Greets, >> Kiste >> >> >> >> Am Sonntag, 20. März 2022, 13:22:14 MEZ hat 'Oliver Seitz' via jallib < >> jal...@googlegroups.com> Folgendes geschrieben: >> >> >> Hi all, >> >> here's my encoder. I looked for something similar to the 12F683 which >> Hans has in stock, and found some 12F629, which should be quite compatible. >> >> >> C1: minimum 1µF, no need to be polarized >> R1:680R..1k >> C2: 100nF >> R2:1k..4k7 >> D1=D2: 1N4148, 1N4001 or similar, silicon, not schottky >> >> This gives a frequency which a line (AUX) audio input should be able to >> handle. The receiver will be the same kind of chip, but it must have a >> comparator and a reference voltage module. TMR0 will be used. >> >> The transmitter will work on any 6 or 8 pin controller, as it doesn't use >> any peripherals. >> >> Greets, >> Kiste >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jallib+un...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/189584036.471955.1647778917998%40mail.yahoo.com >> >> <https://groups.google.com/d/msgid/jallib/189584036.471955.1647778917998%40mail.yahoo.com?utm_medium=email&utm_source=footer>. >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jallib+un...@googlegroups.com. >> To view this discussion on the web visit >> >> https://groups.google.com/d/msgid/jallib/2bdcd32b-101d-4d29-8397-ddbb370e4788n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/jallib/2bdcd32b-101d-4d29-8397-ddbb370e4788n%40googlegroups.com?utm_medium=email&utm_source=footer> >> >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jallib+un...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/1612276249.1299494.1648103861495%40mail.yahoo.com >> >> <https://groups.google.com/d/msgid/jallib/1612276249.1299494.1648103861495%40mail.yahoo.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "jallib" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/jallib/46GAtaPeJ_k/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> jallib+un...@googlegroups.com. >> >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/bac9ec42-c8a3-4f2f-82b1-16b63d06b6f6n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/jallib/bac9ec42-c8a3-4f2f-82b1-16b63d06b6f6n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jallib+un...@googlegroups.com. >> To view this discussion on the web visit >> >> https://groups.google.com/d/msgid/jallib/df201f79-6365-434b-b804-c948ddb305b3n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/jallib/df201f79-6365-434b-b804-c948ddb305b3n%40googlegroups.com?utm_medium=email&utm_source=footer> >> >> . >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jallib+un...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/jallib/523724631.932444.1649178768469%40mail.yahoo.com >> >> <https://groups.google.com/d/msgid/jallib/523724631.932444.1649178768469%40mail.yahoo.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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