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Forum Index : Microcontroller and PC projects : Pico LC meter
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6275 |
I can't / won't design round an Arduino on the grounds that their IDE grinds my PC to a halt. ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| v.lenzer Regular Member  Joined: 04/05/2024 Location: GermanyPosts: 43 |
Hi Volhout! I assume that there is a copper worm somewhere in my setup. But I will still install the original software so that I can be sure that it is not the problem. If that doesn't help, I will either take my setup apart and rebuild it or have a circuit board made that fits exactly in my case. just to be sure: your zero runs at 133 MHz @Mick: I don't want to get in your way. You can design a circuit board and have it made. But in this case, I would like to design a suitable one for my case myself so that all the holes and cutouts fit. I hope you understand. But first I hope that I can find the error. Best wishes! Joachim |
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| v.lenzer Regular Member Joined: 04/05/2024 Location: GermanyPosts: 43 |
Hi Volhout! I'm going crazy. It's actually a software bug. I've installed your version and the measured values are plausible. The 816 pF has a measured value of 810.2 pF. The 82 uH coil has a measured value of 67 uH. I don't know the tolerance of the component (yet). In your version I set Cref to 816e-12. Can I leave Cbase and Lbase as they are? I'm embarrassed that I went to such a trouble. Since I only changed the text output in my opinion, I would never have thought of a software bug. So, now I can turn off my soldering iron and screw the housing together. Thanks again to everyone for the help and especially to you, Volhout, for this great project. Best wishes! Joachim |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 3972 |
Hi Joachim, I think the pico runs at 126MHz (see setup PIO in the listing) since I developped on the PicoMiteVGA. If you run at 133MHz, then it is best to set the PIO speed according (lowest jitter) but the current setting (126MHz = 126e6) will work also. There is nothing in the MMBasic code that requires high speed. Only the PIO is very busy. If you want, change... 'PIO 1.3 f3=126e6 to 'PIO 1.3 f3=133e6 Regards, Volhout Edited 2024-08-02 00:04 by Volhout PicomiteVGA PETSCII ROBOTS |
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