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Yesindeed
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2020/06/17 03:05:58 (permalink)
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post edited by Yesindeed - 2020/06/17 18:29:26
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    du00000001
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    Re: Nokia 5110 LCD Problem (No Contrast Problem) 2020/06/17 14:07:29 (permalink)
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    Check the SPI clock (scope): with your questionable wiring I wouldn't dare to go faster than 2 MHz!
     
    Seems to be your original work - - - because you ot the RST timing wrong (although this is not expected to affect display operation): no need to hold RST down for 100 ms - it just has to happen within the first 100 ms after VCC > 3.0 V (and not earlier).

    PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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    Yesindeed
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    deleted thread 2020/06/17 14:32:55 (permalink)
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    post edited by Yesindeed - 2020/06/17 18:29:54
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    du00000001
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    Re: Nokia 5110 LCD Problem (No Contrast Problem) 2020/06/17 16:28:17 (permalink)
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    If it doesn't work with shorter RST widths, most likely your supply is starting (too) slow.
    Use a pulldown resistor on this line and just wait 1 s prior setting the controlling pin as an output/H. (Or find out how to assess the actual supply voltage. And check the supply with the scope to come.)
     
    Seems you do not really understand the word "within".

    PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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    Aussie Susan
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    Re: Nokia 5110 LCD Problem (No Contrast Problem) 2020/06/17 19:18:46 (permalink)
    +6 (6)
    @yesindeed - Please don't edit your post and delete the contents.
    Your question(whatever it is) may be of interest to other people.
    We all need to learn and learning form each other is what this forum is all about.
    Susan
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    Jim Nickerson
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    Re: Nokia 5110 LCD Problem (No Contrast Problem) 2020/06/18 07:06:21 (permalink)
    +5 (5)
    It is always a challenge to decide if one should quote a post to preserve it in case the OP edits the content.
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    PStechPaul
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    Re: Nokia 5110 LCD Problem (No Contrast Problem) 2020/06/18 12:07:12 (permalink)
    +2 (2)
    It seems that some people think it's OK to delete everything once a problem has been solved. At one place I worked, we came up with "Design Change Notices", or DCNs, which were used to identify a problem, and then they were submitted to engineering (me) and to management, to be approved. They were used to correct mistakes in documentation as well as part substitutions as well as more major design changes. Sometime later I wanted to find out what had changed on a particular product, but I couldn't find the DCN. The manager said that they were thrown out once the change was completed! Perhaps he was a "tidy desk" sicko. ;)

     
    #7
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