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Type: Posts; User: John Drew

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    Re: New PICkit 4 available

    Bit worried my pickit3 might fail one day so being in a good mood as my PSA is still <0.03 and parts are freight free from MicrochipDirect this month I lashed out and bought a PICkit4.
    That may be a...
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    Re: Hx711 calibration

    Hi Alberto
    I have changed the title (but not the link) so that the 8 is prominent, otherwise people may miss the fact that it now covers up to 8 displays.
    I'll send you a private message on a...
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    Re: Why a delay in TX power up?

    I'll be interested in the results Norm.
    John
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    Re: Why a delay in TX power up?

    Hi Norm,
    The easiest way to check if it is TX or RX is to program the squelch on a radio that is to be tested at a distance to 0 so that the radio is noisy at all times. Then see if at a distance...
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    Re: Why a delay in TX power up?

    I think this may possibly confirm that it is a receiver issue. A lot depends on whether the handhelds use noise operated mute or carrier operated mute. Carrier operated systems can be quite slow to...
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    Re: Why a delay in TX power up?

    It could be a power issue but is more likely to be a receiver issue.
    The handhelds I own put their receivers to sleep to save power. They wake from time to time to check the frequency.
    Could it be...
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    Re: Programmable RF oscillators

    Thanks Charlie, when you get the chance. Work and family come first.
    Cheers John

    PS Is pin 20 accessible, just looked at Les's photo of the board - lots of tiny pins!
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    Re: Programmable RF oscillators

    Les, the pin 20 sounds like the way to go. I'd be looking for about 3kHz deviation with a 1kHz tone to be most useful. The deviation would vary with device frequency but some maths would deal with...
  9. Re: Code for Driving 2,3 or 4 seven segment displays

    Hi Alberto,
    Sounds good. No hurry.
    Best wishes
    John
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    Re: Programmable RF oscillators

    Thanks Les,
    Not in my immediate project list but it will be one day, especially if the pin20 can accept some modulation.

    A lot of amateur activity nowadays is on digital modes (specifically FT8...
  11. Re: Code for Driving 2,3 or 4 seven segment displays

    Hi Alberto,
    Would you consider putting it in the WIKI?
    Best wishes
    John
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    Re: Cdata and Cread

    The xtal=4 has nothing to do with how fast the micro runs. It is just an instruction to the compiler to calculate delays, baud rates and any other timing matters.
    The declaration should match the...
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    Re: Ferrite transformer question

    They tell me boot polish adds some flavour Charlie.
    We're not talking cricket after those no hopers let us down.
    Sorry about the slang: metho = methylated spirits.
    Back to topic, great explanation...
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    Re: Ferrite transformer question

    I think half turns Charlie.
    If you ever use Litz wire (and I've still got some in the junkbox) the easiest way to access the wire itself is to dip the end in metho, light the end and it will burn...
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    Re: Ferrite transformer question

    You can definitely have part turns.
    It's well illustrated when dealing with RF. for example you can pass two wires through a ferrite bead as a 1:1 transformer. Voltage is coupled 1:1 to the sensing...
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    Re: Cdata and Cread

    Hi LordFrank1
    Glad you've made progress. Users on this site will always help others if they can and it encourages us when people like you have a shot at creating something first before asking for...
  17. Thread: hatch opener

    by John Drew
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    Re: hatch opener

    A lot of people use them on small satellite dishes. I use one on my satellite tracking system.
    They have a set of contacts on the bottom that you can use to count pulses and thus position.
    However...
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    Re: Cdata and Cread

    LordFrank1, try this.
    Dim RIJ As Code = 13,1,2,3,14,5,6,7,8,9
    Value = CRead8 RIJ[ValueByte] where valuebyte is the position you are picking off e.g. if valuebyte was 0 then you'll pick off 13, if...
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    Re: Why the PIC26K42

    G'day Fanie
    Good to hear you're alive and kicking. Still into PICs and stuff by the sound of it.
    John
  20. Re: Fault in bit wise comparisons on release 3.6.1.2.

    Hi Kbaybar
    I can't get consistent results with the eedata strings. I've written to Les with an example see if he can spot the problem.
    John
  21. Re: Fault in bit wise comparisons on release 3.6.1.2.

    Hi kbaykar
    Funny you should mention the eedata issue.
    I use strings in eedata for the same reason but in a 18f4685.
    One of the strings is not displaying the correct one in a print statement. The...
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    Re: Why the PIC26K42

    Thanks for the replies. Sounds convincing.
    John
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    Why the PIC26K42

    I see a lot of interest in the 18F26K42 and similar chips. I haven't used one and am wondering why the interest in this particular micro family?
    Just curious.
    John
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    Re: Proton stopped working!

    You're right Charlie. It produces a hex file of 12 bytes for an 18F25K20.
    Amazing :)
    I learn something new every day - or is it the same thing I learned yesterday and the day before etc.
    John
  25. Re: Fault in bit wise comparisons on release 3.6.1.2.

    Hi Kbaykar ,
    Did you try using 3.6.1.4?
    It is available from the Files menu.
    John
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    Re: Proton stopped working!

    Hi Colin,
    I've never tried pressing compile on an empty IDE, I think I'd get an error message.
    Try uninstalling PDS and reinstall the full version from the Files button on the forum then update the...
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    Re: Proton stopped working!

    Colin can you provide a short program that demonstrates this?
    John
    VK5DJ
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    Re: About Define directive...

    That fixed it, thanks Les.
    John

    PS I've also created the link to 3.6.1.4 in the Updates link.
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    Re: About Define directive...

    Hi Les,
    That's the same error I'm getting from the assembler. I could make it go away by removing the SDEC and making it DEC. The error message is "Symbol not previously defined"
    The program is...
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    Re: A Universal PIC18 Bootloader for PDS

    That's a simple enough change Alberto, your example makes it clear.
    I had to recompile an old program today and I had problems with the assembler not recognising a call. The particular program goes...
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    Re: A Universal PIC18 Bootloader for PDS

    Hi Alberto,
    That makes sense.
    Best wishes
    John
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    Re: A Universal PIC18 Bootloader for PDS

    Alberto, I'm a bit confused. HRSout still seems to be a legitimate call. Maybe it's something that has happened in the Assembly file?
    John
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    Re: Hx711 calibration

    Hello Amod
    Another way is to bring in an odd number of samples into an array, sort the array and then use the middle value. I saw this elsewhere on the forum and it seems to work well although I...
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    Re: Analyser gives error

    Thanks Johan. I'll wait to see if Harm has advice.
    John
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    Re: Analyser gives error

    Hi Johan
    I can't help with the problem but I can help with the link for people in future.
    Can you please provide WIKI address of the article and the correct link for the file?
    Thanks
    John
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