led_displays [Maakplek]

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We hebben uit Rob zijn oude werkplaats een heleboel displays en onderdelen van displays gekregen die door zijn vader zijn ontwikkeld voor de scoreborden van darts en biljard.
Mocht je hier een idee voor hebben of zelf mee aan de slag willen, de aansturing is erg simpel.

Deze display maakt zoals veel andere displays gebruik van [[schuifregisters]], niet de veelgebruikte hc595 maar een variant daarop die zelf grotere stromen aan kan zonder dat er extra componenten voor nodig zijn.

{{:led-display.jpeg|}}


{{::display.png|}}


voorbeeldcode :
<code>
int OEPin = 7;     // D7 on the arduino Nano
int clearPin = 8;  // D8 on the arduino Nano
int latchPin = 9;  // D9 on the arduino Nano
int dataPin = 11;  // D11 on the arduino Nano
int clockPin = 13; // D13 on the arduino Nano

//     
//   -8-
// 3|   |7
//   -2-
// 4|   |6
//   -5-
//
// bit 1 = not used
//
//0 = 00111111 = 63
//1 = 00000110 = 6
//2 = 01011011 = 91
//3 = 01001111 = 79
//4 = 01100110 = 102
//5 = 01101101 = 109
//6 = 01111101 = 125
//7 = 00000111 = 7
//8 = 01111111 = 127
//9 = 01101111 = 111

byte segChar[] = { 63, 6, 91, 79, 102, 109, 125, 7, 127, 111};

void setup() {
  pinMode(latchPin, OUTPUT);      // set the pin connected to the latch as type OUTPUT
  pinMode(clockPin, OUTPUT);      // set the pin connected to the clock as type OUTPUT
  pinMode(dataPin, OUTPUT);       // set the pin connected to the serial data as type OUTPUT
  pinMode(OEPin, OUTPUT);         // set the pin connected to the Output Enabled as type OUTPUT
  pinMode(clearPin, OUTPUT);      // set the pin connected to the clear as type OUTPUT
  digitalWrite(latchPin, LOW);    // set the pin connected to the latch low for disabled
  digitalWrite(clearPin, HIGH);   // set the pin connected to the clear high for disabled (inverted)
  digitalWrite(OEPin, LOW);       // set the pin connected to the OE low for enabled (inverted)
}

void loop() {
  // for 0 to 9
for (int x=0; x<10; x++){
  // shift out the value associated with the x'th value in the array segChar to the third digit the display
  shiftOut(dataPin, clockPin, MSBFIRST, segChar[x]); 
  // shift out the value associated with the 9-x'th value in the array segChar to the display, 
  // pushing the previous character to the second digit
  shiftOut(dataPin, clockPin, MSBFIRST, segChar[9-x]); 
  // shift out the value associated with the "0" value in the array segChar to the display, 
  // pushing the previous character to the second digit and the first character to the first digit
  shiftOut(dataPin, clockPin, MSBFIRST, segChar[0]); 

  digitalWrite(OEPin, HIGH);    // turn the display off when updating (inverted)
  digitalWrite(latchPin, HIGH); // copy the data from the buffer to the output -
  digitalWrite(latchPin, LOW);  // with a clockpulse on the latch
  digitalWrite(OEPin, LOW);     // turn the display on again (inverted)
  
  delay (1000);                 // update the display every second
  }
}

</code>
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