Flutter Seven Segment Display Card with Lit LED Digits and Register Byte Decoder

A seven segment LED card for embedded, IoT and maker apps: a four digit red display reading 12.45 with unlit segments still glowing faintly, an enlarged digit with segments A to G and the decimal point labelled, its MAX7219 no-decode register byte 0xED in hex and binary, and a DP to G bit strip from D7 to D0.

Anılcan Çakır by Anılcan Çakır 73 views 0 stars 2 weeks ago Rev 1
Flutter Seven Segment Display Card with Lit LED Digits and Register Byte Decoder preview
main.dart
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            WDiv(
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              children: [
                WText(
                  'Segment Decoder',
                  className: 'text-base font-bold text-gray-900 dark:text-white'
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                WText(
                  'MAX7219 no-decode mode',
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            '4 digits',
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      className: 'flex flex-row items-center gap-6 w-full mt-4 rounded-2xl bg-gray-50 dark:bg-gray-800 px-5 py-4',
      children: [
        WDiv(
          className: 'relative w-[92px] h-[130px]',
          children: [
            WText(
              'A',
              className: 'absolute left-[16px] top-[0px] w-[40px] h-[14px] rounded-full text-center text-[10px] font-bold bg-red-500 dark:bg-red-500 text-white'
            ),
            WDiv(
              className: 'absolute left-[0px] top-[16px] w-[14px] h-[40px] rounded-full flex flex-col items-center justify-center bg-gray-200 dark:bg-gray-700',
              child: WText(
                'F',
                className: 'text-[10px] font-bold text-gray-400 dark:text-gray-500'
              )
            ),
            WDiv(
              className: 'absolute left-[58px] top-[16px] w-[14px] h-[40px] rounded-full flex flex-col items-center justify-center bg-red-500 dark:bg-red-500',
              child: WText(
                'B',
                className: 'text-[10px] font-bold text-white'
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            ),
            WText(
              'G',
              className: 'absolute left-[16px] top-[58px] w-[40px] h-[14px] rounded-full text-center text-[10px] font-bold bg-red-500 dark:bg-red-500 text-white'
            ),
            WDiv(
              className: 'absolute left-[0px] top-[74px] w-[14px] h-[40px] rounded-full flex flex-col items-center justify-center bg-red-500 dark:bg-red-500',
              child: WText(
                'E',
                className: 'text-[10px] font-bold text-white'
              )
            ),
            WDiv(
              className: 'absolute left-[58px] top-[74px] w-[14px] h-[40px] rounded-full flex flex-col items-center justify-center bg-gray-200 dark:bg-gray-700',
              child: WText(
                'C',
                className: 'text-[10px] font-bold text-gray-400 dark:text-gray-500'
              )
            ),
            WText(
              'D',
              className: 'absolute left-[16px] top-[116px] w-[40px] h-[14px] rounded-full text-center text-[10px] font-bold bg-red-500 dark:bg-red-500 text-white'
            ),
            WDiv(
              className: 'absolute left-[78px] top-[116px] w-[14px] h-[14px] rounded-full bg-red-500 dark:bg-red-500'
            )
          ]
        ),
        WDiv(
          className: 'flex flex-col',
          children: [
            WText(
              'DIGIT 2 BYTE',
              className: 'text-[10px] font-bold tracking-wide text-gray-500 dark:text-gray-400'
            ),
            WText(
              '0xED',
              className: 'text-3xl font-bold text-gray-900 dark:text-white mt-1'
            ),
            WText(
              '1110 1101',
              className: 'text-sm font-medium text-gray-500 dark:text-gray-400'
            ),
            WDiv(
              className: 'flex flex-row items-center mt-3',
              child: WDiv(
                className: 'rounded-full bg-red-100 dark:bg-red-900/40 px-2 py-1',
                child: WText(
                  '5 segments + DP',
                  className: 'text-[11px] font-bold text-red-700 dark:text-red-300'
                )
              )
            ),
          ]
        ),
      ]
    ),
    WDiv(
      className: 'flex flex-col items-center w-full mt-4',
      children: [
        WDiv(
          className: 'flex flex-row gap-[3px]',
          children: [
            WText(
              'DP',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            ),
            WText(
              'A',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            ),
            WText(
              'B',
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            ),
            WText(
              'C',
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            ),
            WText(
              'D',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            ),
            WText(
              'E',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            ),
            WText(
              'F',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            ),
            WText(
              'G',
              className: 'w-[34px] text-center text-[10px] font-bold text-gray-500 dark:text-gray-400'
            )
          ]
        ),
        WDiv(
          className: 'flex flex-row gap-[3px] mt-1',
          children: [
            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
            ),
            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
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            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
            ),
            WText(
              '0',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-white dark:bg-gray-900 border-gray-300 dark:border-gray-600 text-gray-400 dark:text-gray-500'
            ),
            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
            ),
            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
            ),
            WText(
              '0',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-white dark:bg-gray-900 border-gray-300 dark:border-gray-600 text-gray-400 dark:text-gray-500'
            ),
            WText(
              '1',
              className: 'w-[34px] h-[28px] rounded-md border text-center text-sm font-bold pt-[5px] bg-red-500 dark:bg-red-500 border-red-500 dark:border-red-500 text-white'
            )
          ]
        ),
        WDiv(
          className: 'flex flex-row items-center justify-between w-[293px] mt-1',
          children: [
            WText(
              'D7',
              className: 'text-[10px] text-gray-400 dark:text-gray-500'
            ),
            WText(
              'MSB first',
              className: 'text-[10px] text-gray-400 dark:text-gray-500'
            ),
            WText(
              'D0',
              className: 'text-[10px] text-gray-400 dark:text-gray-500'
            ),
          ]
        ),
      ]
    ),
    WDiv(
      className: 'w-full mt-4',
      child: WButton(
        className: 'w-full rounded-2xl bg-gray-900 dark:bg-white py-3',
        child: WDiv(
          className: 'flex flex-row items-center justify-center gap-2',
          children: [
            WText(
              'Write register',
              className: 'text-sm font-bold text-white dark:text-gray-900'
            ),
            WIcon(
              Icons.arrow_forward,
              className: 'text-white dark:text-gray-900 text-base'
            ),
          ]
        )
      )
    ),
  ]
)
Stats
Views
73
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Revisions
1
Size
14,264 chars
Created
Oct 14, 2026