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8位 七段顯示器模組 八位 串列控制 max7219晶片 驅動
原始價格：NT$120。NT$95目前價格：NT$95。 (未稅)
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描述
描述
8位 七段顯示器模組 八位 串列控制 MAX7219 晶片 驅動
- 採用MAX7219 驅動數碼管，需要單片機3路IO口，根據數碼管動態掃描原理進行顯示；
- 寬工作電壓3.3V到5V；
- PCB板尺寸：71mm*22mm
- 數碼管型號：0.36 4位共陽
8 digital LED Display Module eight serial module MAX7219 drives
- Use two MAX7219 digital control, 3-way needed microcontroller IO port, according to the digital display dynamic scanning principle
- Wide Operating Voltage: 3.3V to 5V
- Digital Tube Model: 0.36 4 common anode
- PCB Plate Size: 71X22X10mm/2.79*0.86*0.39″”
Arduino 範例一
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/* Modify from Liquid Crystal example For 8 x 7 segment module */ #define LATCH 12 //pin 12 of BBFuino connect to RCK of 8x7segment module #define CLOCK 11 //pin 11 of BBFuino connect to SCK of 8x7segment module #define DATA 10 //pin 10 of BBFuino connect to DIO of 8x7segment module #define LED 13 //LED is connected to pin 13 of Arduino #define MultiplexDelay 1 //delay for multiplexing between digit on 8x7segment module #define LEFT 0 // define the value for left justify #define RIGHT 1 // define the value for right justify #define BLANK 11 //array element to make 7segment blank // array to activate particular digit on the 8x7segment module // it is the common anode of 7 segment byte anode[8] = { 0b10000000, //digit 1 from right 0b01000000, //digit 2 from right 0b00100000, //digit 3 from right 0b00010000, //digit 4 from right 0b00001000, //digit 5 from right 0b00000100, //digit 6 from right 0b00000010, //digit 7 from right 0b00000001 //digit 8 from right }; //array for decimal number, it is the cathode, please refer to the datasheet. //therefore a logic low will activete the particular segment //PGFEDCBA, segment on 7 segment, P is the dot byte cathode[12] = {0b11000000, // 0 0b11111001, // 1 0b10100100, // 2 0b10110000, // 3 0b10011001, // 4 0b10010010, // 5 0b10000010, // 6 0b11111000, // 7 0b10000000, // 8 0b10010000, // 9 0b01111111, //dot 0b11111111 //blank }; //fucntion to send the serial data out to two 74HC595 serial to parallel shift register and activate the 7 segment. void display8x7segment(byte datapin, byte clockpin, byte latchpin, byte digit, byte number) { digitalWrite(latchpin, LOW); shiftOut(datapin, clockpin, MSBFIRST, digit); // clears the right display shiftOut(datapin, clockpin, MSBFIRST, number); // clears the left display digitalWrite(latchpin, HIGH); } //function to display value on 8x7 segment display according to the justify state void displayNumber8x7segment(byte justify, unsigned long value) { byte decimal[8] = {0}; value = value % 100000000; //ensure the value is within 8 digits only decimal[7] = value / 10000000; //extract digit 7 from value value = value % 10000000; //extract the rest of 7 digit value decimal[6] = value / 1000000; value = value % 1000000; decimal[5] = value / 100000; value = value % 100000; decimal[4] = value / 10000; value = value % 10000; decimal[3] = value / 1000; value = value % 1000; decimal[2] = value / 100; value = value % 100; decimal[1] = value / 10; decimal[0] = value % 10; byte zero = 0; if (justify == RIGHT) { for(byte e = 8; e > 0 ; e --) { if(zero == 0) { if(decimal[e-1] != 0) { display8x7segment(DATA, CLOCK, LATCH, anode[e-1], cathode[decimal[e-1]]); zero = 1; } } else display8x7segment(DATA, CLOCK, LATCH, anode[e-1], cathode[decimal[e-1]]); delay(MultiplexDelay); } } else //if justify == left { byte d = 0; for(byte e = 8; e > 0; e --) { if(zero == 0) { if(decimal[e-1] != 0) { display8x7segment(DATA, CLOCK, LATCH, anode[7], cathode[decimal[e-1]]); zero = 1; d ++; delay(MultiplexDelay); } } else { display8x7segment(DATA, CLOCK, LATCH, anode[7-d], cathode[decimal[e-1]]); d ++; delay(MultiplexDelay); } } } } void setup() { pinMode(LATCH, OUTPUT); pinMode(CLOCK, OUTPUT); pinMode(DATA, OUTPUT); pinMode(LED, OUTPUT); digitalWrite(LATCH, HIGH); digitalWrite(LED, LOW); //off LED // set up the LCD's number of columns and rows: delay(1000); //delay for 1 second } void loop(){ //1st demo, 8x7segment will display decimal value from 0 to 9 and dot from 1st digit (most right) until the last digit (most right) for(byte i = 0; i < 8; i++) { for(byte k = 0; k < 11; k++) { display8x7segment(DATA, CLOCK, LATCH, anode[i], cathode[k]); delay(300); } } delay(1000); //delay 1 second //2nd demo, 8x7segment will display same decimal from 0 to 9 and dot across all 8 digit for(byte k = 0; k < 11; k++) { display8x7segment(DATA, CLOCK, LATCH, 0xff, cathode[k]); //activate all digit delay(300); } delay(1000); //delay 1 second //3rd demo, 8x7segment will display a decimal value increasing like normal counter. for (unsigned long value = 0; value < 100000000; value ++) { for(byte i = 0; i < 10 ; i ++) { displayNumber8x7segment(RIGHT, value); //display the value in right justify format } } delay(1000); } |
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