{"id":787,"date":"2020-09-20T19:20:52","date_gmt":"2020-09-20T18:20:52","guid":{"rendered":"http:\/\/www.igfasouza.com\/blog\/?p=787"},"modified":"2021-05-20T14:17:32","modified_gmt":"2021-05-20T13:17:32","slug":"7-segment-display","status":"publish","type":"post","link":"http:\/\/www.igfasouza.com\/blog\/7-segment-display\/","title":{"rendered":"7 Segment Display"},"content":{"rendered":"

\"\"<\/p>\n

What\u2019s the crack jack?<\/b><\/p>\n

Table of contents<\/h2>\n

1. 7-Segment Display
\n2. Cathode vs Anode
\n3. Components
\n4. Schematics
\n5. Code
\n6. PI4J
\n7. Links<\/p>\n

1. 7-Segment Display<\/h2>\n

The 7-segment display, also written as \u201cseven segment display\u201d, consists of seven LEDs (hence its name) arranged in a rectangular fashion as shown. Each of the seven LEDs is called a segment because when illuminated the segment forms part of a numerical digit (both Decimal and Hex) to be displayed. An additional 8th LED is sometimes used within the same package thus allowing the indication of a decimal point (DP).<\/p>\n

\"\"
\nA 7-segment is a packaged set of 8 LEDs (7 number-segments & 1 decimal point).<\/p>\n

I have the \u201chdsp-c1g1<\/strong><\/em>\u201d model and it is a Common-Anode.<\/p>\n

2. Cathode vs Anode<\/h2>\n

Common anode means that the anode (positive) side of all of the LEDs is electrically connected at one pin, and each LED cathode has its own pin. So turning on any particular segment will involve running a current from this common anode (positive) pin to the particular cathode (negative) pin for the desired segment.<\/p>\n

\"\"<\/p>\n

Common cathode means that the cathodes of all of the LEDs are common and connected to a single pin. The anode for each LED has its own pin. So driving one of these means running a current from the particular anode (positive) pin for the desired segment to the common cathode pin.<\/p>\n

\"\"<\/p>\n

The way that you are diving the 7-segment involves using a separate pin to drive each segment, so you use 8 pins of the Arduino to drive the display.<\/p>\n

3. Components<\/h2>\n
    \n
  • \n1x Arduino\n<\/li>\n
  • \n1x Raspberry Pi\n<\/li>\n
  • \n1x Common-Anode 7-segment display\n<\/li>\n
  • \n8x Resistor 221 ohm\n<\/li>\n
  • \n10x Jumper wires (generic)\n<\/li>\n<\/ul>\n

    4. Schematics<\/h2>\n

    Common-Anode 7-segment display<\/p>\n

    \"\"<\/p>\n

    My 7-segment display has its common pins (COM) connected to the +5V pin.
    \nIf a pin turns off, the corresponding segment will turn on. It’s because when the pin is on, the voltage difference between the pin and the +5V is 0. It is the same if the +5V was replaced by 0V. We can’t connect the COM to the GND because the LEDs are like diodes so they wouldn’t light up at all.<\/p>\n

    \"\"<\/p>\n

    For Raspberry PI you need to check the GPIO numbers. Note that the pin number is not the same thing as the GPIO number.<\/p>\n

    \"\"<\/p>\n

    For my example here I create a table to map:<\/p>\n

    \"\"<\/p>\n

    \"\"<\/p>\n

    5. Code<\/h2>\n

    Arduino<\/b><\/p>\n

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    <\/div><\/td>
    void<\/span> setup(<\/span>)<\/span>
    \n{<\/span>
    \n  init(<\/span>)<\/span>;<\/span>
    \n  \/*your setup code here*\/<\/span>
    \n}<\/span>
    \n
    \nvoid<\/span> loop(<\/span>)<\/span>
    \n{<\/span>
    \n  \/*
    \n   * your loop code here
    \n   *
    \n   * use display(num, dp) to display num (0123456789ABCDEF)
    \n   * and the dot (if dp).
    \n   *
    \n   * you can turn off all the leds by writing display().
    \n   *\/<\/span>
    \n}<\/span>
    \n
    \nvoid<\/span> init(<\/span>)<\/span>
    \n{<\/span>
    \n  pinMode(<\/span>2<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>3<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>4<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>5<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>6<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>7<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>8<\/span>, OUTPUT)<\/span>;<\/span>
    \n  pinMode(<\/span>9<\/span>, OUTPUT)<\/span>;<\/span>
    \n}<\/span>
    \n
    \nvoid<\/span> display(<\/span>int<\/span> n=-<\/span>1<\/span>, boolean<\/span> dp)<\/span>
    \n{<\/span>
    \n  digitalWrite(<\/span>9<\/span>, !<\/span>dp)<\/span>;<\/span>
    \n  if<\/span>(<\/span>num ==<\/span> 0<\/span>)<\/span>
    \n  {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 1<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 1<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 1<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 2<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 3<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 4<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 5<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 6<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 7<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 1<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 8<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 9<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 10<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 11<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 12<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 1<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 13<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 14<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> if<\/span>(<\/span>num ==<\/span> 15<\/span>)<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 0<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 0<\/span>)<\/span>;<\/span>
    \n  }<\/span> else<\/span> {<\/span>
    \n    digitalWrite(<\/span>2<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>3<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>4<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>5<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>6<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>7<\/span>, 1<\/span>)<\/span>;<\/span>
    \n    digitalWrite(<\/span>8<\/span>, 1<\/span>)<\/span>;<\/span>
    \n  }<\/span>
    \n}<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

    Raspberry PI – Python<\/b><\/p>\n

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    <\/div><\/td>
    from<\/span> gpiozero import<\/span> LED
    \nfrom<\/span> time<\/span> import<\/span> sleep
    \n
    \npin01 =<\/span> LED(<\/span>2<\/span>)<\/span>
    \npin02 =<\/span> LED(<\/span>3<\/span>)<\/span>
    \npin04 =<\/span> LED(<\/span>4<\/span>)<\/span>
    \npin05 =<\/span> LED(<\/span>5<\/span>)<\/span>
    \npin06 =<\/span> LED(<\/span>6<\/span>)<\/span>
    \npin07 =<\/span> LED(<\/span>12<\/span>)<\/span>
    \npin09 =<\/span> LED(<\/span>14<\/span>)<\/span>
    \npin10 =<\/span> LED(<\/span>15<\/span>)<\/span>
    \n
    \n
    \ndef<\/span> clear(<\/span>)<\/span>:
    \n    pin01.on<\/span>(<\/span>)<\/span>
    \n    pin02.on<\/span>(<\/span>)<\/span>
    \n    pin04.on<\/span>(<\/span>)<\/span>
    \n    pin05.on<\/span>(<\/span>)<\/span>
    \n    pin06.on<\/span>(<\/span>)<\/span>
    \n    pin07.on<\/span>(<\/span>)<\/span>
    \n    pin09.on<\/span>(<\/span>)<\/span>
    \n    pin10.on<\/span>(<\/span>)<\/span>
    \n
    \n
    \ndef<\/span> display(<\/span>number)<\/span>:
    \n    if<\/span> number ==<\/span> 0<\/span>:
    \n        pin01.off<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.on<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 1<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.on<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.on<\/span>(<\/span>)<\/span>
    \n        pin09.on<\/span>(<\/span>)<\/span>
    \n        pin10.on<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 2<\/span>:
    \n        pin01.off<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.on<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.on<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 3<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.on<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 4<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.on<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.on<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 5<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.on<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 6<\/span>:
    \n        pin01.off<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.off<\/span>(<\/span>)<\/span>
    \n        pin06.on<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 7<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.on<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.on<\/span>(<\/span>)<\/span>
    \n        pin10.on<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 8<\/span>:
    \n        pin01.off<\/span>(<\/span>)<\/span>
    \n        pin02.off<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.on<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n    if<\/span> number ==<\/span> 9<\/span>:
    \n        pin01.on<\/span>(<\/span>)<\/span>
    \n        pin02.on<\/span>(<\/span>)<\/span>
    \n        pin04.off<\/span>(<\/span>)<\/span>
    \n        pin05.off<\/span>(<\/span>)<\/span>
    \n        pin06.off<\/span>(<\/span>)<\/span>
    \n        pin07.off<\/span>(<\/span>)<\/span>
    \n        pin09.off<\/span>(<\/span>)<\/span>
    \n        pin10.off<\/span>(<\/span>)<\/span>
    \n
    \n
    \nclear(<\/span>)<\/span>
    \nsleep(<\/span>1<\/span>)<\/span>
    \nwhile<\/span> True<\/span>:
    \n    for<\/span> x in<\/span> range<\/span>(<\/span>10<\/span>)<\/span>:
    \n        display(<\/span>x)<\/span>
    \n        sleep(<\/span>1<\/span>)<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

    6. PI4J<\/h2>\n

    PI4J provides a friendly object-oriented I\/O API and implementation libraries for Java programmers to access the full I\/O capabilities of the Raspberry Pi platform. This project abstracts the low-level native integration and interrupts monitoring to enable Java programmers to focus on implementing their application business logic. <\/p>\n

    Note<\/strong>: Pi4J (by default) uses an abstract pin numbering scheme to help insulate software from hardware changes.Pi4J implements the same pin number scheme as the Wiring Pi <\/p>\n

    http:\/\/wiringpi.com\/pins\/<\/a><\/p>\n

    This is the Number for the PI 3 B model.<\/p>\n

    \"\"<\/p>\n

    Because the PI4J use a different GPIO number I add a new column in my table;<\/p>\n

    \"\"<\/p>\n

    Raspberry PI – Java – Pi4j<\/b><\/p>\n

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    <\/div><\/td>
    package<\/span> led.example<\/span>;<\/span>
    \n
    \nimport<\/span> com.pi4j.io.gpio.GpioController<\/span>;<\/span>
    \nimport<\/span> com.pi4j.io.gpio.GpioFactory<\/span>;<\/span>
    \nimport<\/span> com.pi4j.io.gpio.GpioPinDigitalOutput<\/span>;<\/span>
    \nimport<\/span> com.pi4j.io.gpio.PinState<\/span>;<\/span>
    \nimport<\/span> com.pi4j.io.gpio.RaspiPin<\/span>;<\/span>
    \n
    \npublic<\/span> class<\/span> SevenSegmentsDisplay {<\/span>
    \n
    \n    static<\/span> GpioPinDigitalOutput pin01 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin02 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin04 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin05 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin06 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin07 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin09 =<\/span> null<\/span>;<\/span>
    \n    static<\/span> GpioPinDigitalOutput pin10 =<\/span> null<\/span>;<\/span>
    \n
    \n    public<\/span> static<\/span> void<\/span> display(<\/span>int<\/span> number)<\/span> {<\/span>
    \n
    \n        if<\/span>(<\/span>number ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n            pin01.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.high<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 1<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.high<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 2<\/span>)<\/span> {<\/span>
    \n            pin01.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 3<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 4<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 5<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 6<\/span>)<\/span> {<\/span>
    \n            pin01.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 7<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.high<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 8<\/span>)<\/span> {<\/span>
    \n            pin01.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n        if<\/span>(<\/span>number ==<\/span> 9<\/span>)<\/span> {<\/span>
    \n            pin01.high<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin02.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin04.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin05.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin06.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin07.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin09.low<\/span>(<\/span>)<\/span>;<\/span>
    \n            pin10.low<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n
    \n    }<\/span>
    \n
    \n    public<\/span> static<\/span> void<\/span> main(<\/span>String<\/span><\/a>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n
    \n        final<\/span> GpioController gpio =<\/span> GpioFactory.getInstance<\/span>(<\/span>)<\/span>;<\/span>
    \n
    \n        pin01 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_08<\/span>)<\/span>;<\/span>
    \n        pin02 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_09<\/span>)<\/span>;<\/span>
    \n        pin04 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_07<\/span>)<\/span>;<\/span>
    \n        pin05 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_21<\/span>)<\/span>;<\/span>
    \n        pin06 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_22<\/span>)<\/span>;<\/span>
    \n        pin07 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_26<\/span>)<\/span>;<\/span>
    \n        pin09 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_15<\/span>)<\/span>;<\/span>
    \n        pin10 =<\/span> gpio.provisionDigitalOutputPin<\/span>(<\/span>RaspiPin.GPIO_16<\/span>)<\/span>;<\/span>
    \n
    \n        pin01.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin02.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin04.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin05.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin06.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin07.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin09.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n        pin10.setShutdownOptions<\/span>(<\/span>true<\/span>, PinState.HIGH<\/span>)<\/span>;<\/span>
    \n
    \n        try<\/span> {<\/span>
    \n            while<\/span>(<\/span>true<\/span>)<\/span> {<\/span>
    \n                for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 10<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n                    display(<\/span>i)<\/span>;<\/span>
    \n                        System<\/span><\/a>.out<\/span>.println<\/span>(<\/span>"Number "<\/span> +<\/span> i)<\/span>;<\/span>
    \n                        Thread<\/span><\/a>.sleep<\/span>(<\/span>2000<\/span>)<\/span>;<\/span>
    \n                }<\/span>
    \n            }<\/span>
    \n        }<\/span> catch<\/span> (<\/span>    InterruptedException<\/span><\/a> e)<\/span> {<\/span>
    \n            e.printStackTrace<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span> finally<\/span> {<\/span>
    \n            gpio.shutdown<\/span>(<\/span>)<\/span>;<\/span>
    \n        }<\/span>
    \n    }<\/span>
    \n
    \n}<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

    Results<\/b><\/p>\n

    \"\"<\/p>\n

    \"\"<\/p>\n

    \n

    Just playing …<\/p>\n

    Raspberry PI I did the code in Python and Java
    Arduino C     #raspberrypi<\/a> #arduino<\/a> pic.twitter.com\/rmDRiAJsO6<\/a><\/p>\n

    — Igor Souza (@Igfasouza) May 2, 2020<\/a><\/p><\/blockquote>\n