Lesson 19--Microduino Two Digital Tube Static Display

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This tutorial will teach you how to use Microduino to measure two digital tube and use two digital tubes to display a double-digit



第十九课-Microduino 2位数码管原理图.jpg

Pin Table

Microduino Pin Digital Tube Pin
D2 10(A)
D3 9(B)
D4 1(C)
D5 4(D)
D6 3(E)
D7 6(F)
D8 5(G)
9 2(DP)
D10 8(LED1)
D11 7(LED2)


byte digit0 = 10;	//Ten digits Microduino pin
byte digit1 = 11;	//Single digit Microduino pin
byte dotPin = 2;	//Decimal point pin

byte sevenSegmentPins[] = {2,3,4,5,6,7,8};	//A,B,C,D,E,F,G Microduino pin
byte sevenSegment[10][7] =
  //a b c d e f g
  { 0,0,0,0,0,0,1 },  // = 0
  { 1,0,0,1,1,1,1 },  // = 1
  { 0,0,1,0,0,1,0 },  // = 2
  { 0,0,0,0,1,1,0 },  // = 3
  { 1,0,0,1,1,0,0 },  // = 4
  { 0,1,0,0,1,0,0 },  // = 5
  { 0,1,0,0,0,0,0 },  // = 6
  { 0,0,0,1,1,1,1 },  // = 7
  { 0,0,0,0,0,0,0 },  // = 8
  { 0,0,0,1,1,0,0 }   // = 9

void setup()

	//Initialize all lights up
   pinMode(dotPin, OUTPUT); //pin 2
   pinMode(digit0, OUTPUT); //pin 10
   pinMode(digit1, OUTPUT); //pin 11

  for(int i=0; i<7; i++)
    pinMode(sevenSegmentPins[i], OUTPUT);
  digitalWrite(dotPin, HIGH);
  digitalWrite(digit0, HIGH);
  digitalWrite(digit1, HIGH);

//Display number
void segmentWrite(byte digit)
  byte pin = 2;
  for (byte i=0; i<7; ++i)
    digitalWrite(pin, sevenSegment[digit][i]);

void loop()
  //Display 68
  digitalWrite(digit0, LOW);   //Turn off ten digits tube
  segmentWrite(8);             //Display single digits 8
  delay(10);                  //Delay 10ms 
  digitalWrite(digit0, HIGH);  //Turn on ten digits tube
  digitalWrite(digit1, LOW);   //Trun off single digits tube
  segmentWrite(6);             //Display ten digits tube 6
  delay(10);                  //Delay 10ms
  digitalWrite(digit1, HIGH);  //Turn on single digits tube


Step 1: You need to know what the pin definition of the two digital tube that you used. The definition of different manufacturer is different, don't guess it. How to measure the digital tube pin?

As well as one digital tube, all digital tube has two types that are common cathode (8 LED cathode sharing a pin) and common anode (8 LED anode sharing a pin), so the two digital tube has two common cathode and common anode pin.

Two digital tube pin, as follows:

第十九课-Microduino 2位数码管常用引脚图.jpg

Find common cathode and common anode:

Firstly, we find a power supply (3 to 5 v) and 1kΩ (or hundreds of ohm) resistor, VCC concatenated a resistor amd GND connect to arbitrary two pin, there are a lot of combinations, but there is always a LED light, find one is enough, then keep GND connection, VCC one by one touch the left pin, if there are multiple leds (usually 8), that is common cathode. Instead keep VCC connection, GND one by one touch the left foot, if there are multiple leds (usually 8), that is common code.

Multimeter or 3 v battery used to test, two digital tube has two selections, bit select and segment select. There are ten pins, as long as connect the pin of the multimeter or 3v battery to the bit select end, another pin connect to segment select end.

第十九课-Microduino 2位数码管测量引脚图.jpg

Detailed information, please refer to the following video.

Step 2: Copy the code to IDE and compile it.

Step 3: Set up circuit, as follows:

第十九课-Microduino 2位数码管连接图.jpg

Step 4: Run program

Step 5: Observe the digital tube


Digital tube displays number 68.