Lesson 19--Microduino Two Digital Tube Static Display

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Objective This tutorial will teach you how to use Microduino to measure two digital tube and use two digital tubes to display a double-digit Equipment Microduino-Core Microduino-FT232R Other hardware equipment Breadboard Jumper one box Breadboard one piece Two digital tube one USB Data cable one Schematic 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) Program 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]); ++pin; } } 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 } Debug 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: 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 cnode. 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. 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： Step 4：Run program Step 5：Observe the digital tube Result Digital tube displays number 68. Video Measure two digits tube pin： http://v.youku.com/v_show/id_XNjc4MjQyMDc2.html