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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