Still foggy, just wait a little longer with this case. Op zaterdag 26 maart 2022 om 20:05:55 UTC+1 schreef [email protected]:
> 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 [email protected]: > >> Hi Marieke, >> >> Thanks for the update. Let's hope Hans recovers soon. >> >> Kind regards, >> >> Rob >> >> ------------------------------ >> *Van:* 'Oliver Seitz' via jallib <[email protected]> >> *Verzonden:* donderdag 24 maart 2022 07:37 >> >> *Aan:* [email protected] <[email protected]> >> *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 <[email protected]> >> 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 < >> [email protected]> 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 [email protected]. >> 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 [email protected]. >> 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 [email protected]. >> 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 the Google Groups "jallib" group. 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