matrix.writeDigitRaw(0, 0b00111000);

Syntax:
0b0GFEDCBA
  A
F   B
  G
E   C
  D

0b01111000 = t
0b01110110 = H
0b01110011 = P

Eksempel program med 7-segment display:

#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

Adafruit_7segment matrix = Adafruit_7segment();

float
  current_temperature = -9.99,
  current_humidity    = 67.992009,
  current_pressure    = 1009.51,
  current_lux         = 109.51443;

uint8_t
  display_status = 1;

const uint8_t
  inputPinButton = 10,
  outputPinReset = 9,
  outputPinLed   = 8;

const uint16_t
  buttonDisplayTime = 500,
  buttonResetTime   = 5000;

unsigned long
  buttonPushMillis;

bool
  buttonTimerStarted, 
  buttonActionFinished        = false, 
  buttonActionDisplayFinished = false;

void updateDisplay() {

  Serial.println("TEST");

  if(display_status == 1) {
    matrix.print(current_temperature, current_temperature < -9.9 ? 0 : 1);
    matrix.writeDigitRaw(0, 0b01111000);
    matrix.writeDisplay();
  }

  if(display_status == 2) {
    matrix.print(current_humidity, 0);
    matrix.writeDigitRaw(0, 0b01110110);
    matrix.writeDisplay();
  }

  if(display_status == 3) {
    matrix.print(current_pressure, 0);
    matrix.writeDigitRaw(0, 0b01110011);
    if(current_pressure >= 999.5) {
      matrix.writeDigitRaw(1, 0b01110101);
    }
    matrix.writeDisplay();
  }

  if(display_status == 4) {
    bool writeK = false;
    float current_lux2;
    if(current_lux >= 999.5) {
      current_lux2 = current_lux/1000.00;
      writeK = true;
    }
    matrix.print(writeK ? current_lux2 : current_lux, writeK ? 1 : 0);
    matrix.writeDigitRaw(0, 0b00111000);
    if(writeK) {
      matrix.writeDigitRaw(1, 0b01110101);
    }
    matrix.writeDisplay();
  }

}

void updateDisplayStatus()
{
  if(display_status == 4) {
    display_status = 1;
    return;
  } 
  if(display_status == 3) {
    display_status = 4;
    return;
  } 
  if(display_status == 2) {
    display_status = 3;
    return;
  } 
  if(display_status == 1) {
    display_status = 2;
    return;
  }
}

void resetArduino() {
  Serial.println("HEI");
}

void setup() {

  pinMode(inputPinButton, INPUT_PULLUP);
  pinMode(outputPinReset, OUTPUT);
  digitalWrite(outputPinReset, HIGH);

  matrix.begin(0x70);

  updateDisplay();

}

void loop() {

  int c = !digitalRead(inputPinButton);

  if(!c) {
    buttonPushMillis = 0;
    buttonTimerStarted = false;
    buttonActionFinished = false;
    buttonActionDisplayFinished = false;
  } else {
    if(!buttonTimerStarted) {
      buttonPushMillis = millis();
    }
    buttonTimerStarted = true;
  }

  if(buttonTimerStarted) {

    if(!buttonActionDisplayFinished && (millis()-buttonPushMillis > buttonDisplayTime)) {
      buttonActionDisplayFinished = true;
      updateDisplayStatus();
      updateDisplay();
    }

    if(!buttonActionFinished && (millis()-buttonPushMillis > buttonResetTime)) {
      buttonPushMillis = 0;
      buttonTimerStarted = false;
      buttonActionFinished = true;
      resetArduino();
    }

  }

}