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Serial 4-digit LED Display Modules


QIFEI 4-bit LED Digital Tube Module

(2 x 74HC595 based)

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First quick test using Adafruit Perma Proto test board #4

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Extra "cascade" connector & "feet" added

Cascade Tests:

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CATALEX 4-Digit Display v1.0

(TM1637 based)

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CATALEX 4-Digit Digital Clock Display v1.0

(TM1637 based)

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LC Technology 2 x 4-Digit Display

(2 x 74HC164 based)

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First, Quick Tests: 1

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Note: SPI CE signal is not in use!

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printf "\000\377" > /dev/spidev0.1

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printf "\000\017" > /dev/spidev0.1

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printf "\000\360" > /dev/spidev0.1

Second Set of Tests: 2

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./src/spi_led_2x4d_demo -MXT -W -X

./src/spi_led_2x4d_demo -MX8DI 31422017 -W -X

./src/spi_led_2x4d_demo -MXUDI 8765 -X -W

./src/spi_led_2x4d_demo -MXLDI 4321 -X -W

pi@raspiP3BStretch16Gb:~/i2c_spi_chips-0.0 $ ./src/spi_led_2x4d_demo
spi_led_2x4d_demo.c Version 0.01 {Exp}, [30/09/2017], (c) F_Trevor_Gowen
                <--| Package i2c_spi_chips_0.0 |-->
Usage spi_led_2x4d_demo  [Options]
Options: -a arg_filename[.arg],
         -E       {Echo command-line arguments},
         -DON     {Display fully ON},
         -DOFF    {Display fully OFF},
         -MXUDI d {MultipleXed Upper Display of 4-digit Integer d},
         -MXLDI d {MultipleXed Lower Display of 4-digit Integer d},
         -MX8DI d {MultipleXed Display of 8-digit Integer d},
         -MXT     {MultipleXed digits Test},
         -Q       {Quiet - default},
         -SQT     {SeQuential digit block Test},
         -S       {use System call methods - default},
         -V       {Verbose},
         -W       {use Wiring pi spi methods},
         -X       {eXecute demonstration}.


  1. Unmultiplexed (1)

  2. Software Multiplexed (2)


2018-06-16 20:29