Arduino UNO学习笔记(5): 数码管显示温度--代码部分
0. 实验目的
数码管显示温度
书接上回Arduino UNO学习笔记(4): 数码管+温度传感器=＞显示温度-CSDN博客。
1. 代码
1.1 文件构成
代码共由3个文件及两个包组成
文件列表：
- demo.ino
- SegmentDisplay.h
- SegmentDisplay.cpp
安装列表：
- OneWire
- DallasTemperature
1.2 demo.ino
#include "SegmentDisplay.h"
#include
#include
#define LED_A 12 // x define Arduino GPIO1 for led a
#define LED_B 8 // x define Arduino GPIO2 for led b
#define LED_C 4 // x define Arduino GPIO3 for led c
#define LED_D 6 // x define Arduino GPIO4 for led d
#define LED_E 7 // x define Arduino GPIO5 for led e
#define LED_F 11 // x define Arduino GPIO6 for led f
#define LED_G 3 // x define Arduino GPIO7 for led g
#define LED_H 5 // x define Arduino GPIO8 for led h
#define LED_D1 -1 // x 如果想让数码管从第一位开始显示，可以设置为13, 由于引脚不够用，此处把线给拔掉了,设置为-1
#define LED_D2 10 // x
#define LED_D3 9 // x
#define LED_D4 2 // x
#define PIN_TEMP 13 // 将原本LED_D1对应的引脚设置为温度引脚，引脚不够用，实属无奈
int count = 0; // 计数器, count>thr退出
int n_t = 0; // 温度, 摄氏度
SegmentDisplay dig_tube(
LED_A, LED_B, LED_C, LED_D, LED_E, LED_F, LED_G, LED_H,
LED_D1, LED_D2, LED_D3, LED_D4
); // 定义数码管类
OneWire oneWire_8(PIN_TEMP); // 18B20数字温度传感器接Arduino上的数字引脚
DallasTemperature sensors_8(&oneWire_8); // 将oneWire地址传递给DallasTemperature库
DeviceAddress insideThermometer; // 定义设备地址
void setup()
{
Serial.begin(9600);
dig_tube.TurnOffAllLed(); // 关闭数码管的所有LED
sensors_8.getAddress(insideThermometer, 0); // 读取传感器地址
sensors_8.setResolution(insideThermometer, 10); // 设置分辨率
}
void loop()
{
if (count % 50 == 0) // 定期刷新温度, 在刷的时候会导致LED暗了一瞬
{
sensors_8.requestTemperatures(); // 传感器获取温度
float temp = sensors_8.getTempC(insideThermometer); // 获取摄氏度, 此处也支持华氏温度：getTempC --> getTempF
if (temp < 50 && temp > -50) // 过滤异常的温度值, 传感器在初始化的时候会产生异常值, 如: -127℃, 85℃
{
n_t = (int)temp;
}
}
dig_tube.DisplayChar(n_t); // 显示温度值
delay(5);
count++;
if (count >= 5000) {
dig_tube.TurnOffAllLed();
exit(0);
}
}
1.3 SegmentDisplay.h
#ifndef _SEGMENT_DISPLY_H_
#define _SEGMENT_DISPLY_H_
#include
#include
//the common VCC pin dight value
#define DIGHT_0 0xC0
#define DIGHT_1 0xF9
#define DIGHT_2 0xA4
#define DIGHT_3 0xB0
#define DIGHT_4 0x99
#define DIGHT_5 0x92
#define DIGHT_6 0x82
#define DIGHT_7 0xF8
#define DIGHT_8 0x80
#define DIGHT_9 0x90
#define DIGHT_OFF 0x00
#define DIGHT_NUMBLE(n) DIGHT_##n
typedef enum {
SEGMENT_DISPLY_1BIT,
SEGMENT_DISPLY_4BIT,
SEGMENT_DISPLY_8BIT
}E_DIGHT_DISPLYA_TYPE;
class SegmentDisplay {
private :
uint8_t dight_pin[8];
uint8_t dight_select_pin[4];
E_DIGHT_DISPLYA_TYPE mode;
void numble2dis(int numble);
public :
byte dight_display[10];
byte display_array[4];
SegmentDisplay(uint8_t a, uint8_t b, uint8_t c, uint8_t d, uint8_t e, uint8_t f, uint8_t g, uint8_t h);
SegmentDisplay(uint8_t a, uint8_t b, uint8_t c, uint8_t d, uint8_t e, uint8_t f, uint8_t g, uint8_t h, uint8_t d1, uint8_t d2, uint8_t d3, uint8_t d4);
void TurnOffAllLed(void);
void DisplayChar(byte n);
void DisplayChar(int n);
void DisplayChar(byte sel, byte n);
};
#endif
1.4 SegmentDisplay.cpp
#include "SegmentDisplay.h"
SegmentDisplay::SegmentDisplay(
uint8_t a, uint8_t b, uint8_t c, uint8_t d, uint8_t e, uint8_t f, uint8_t g, uint8_t h
)
{
mode = SEGMENT_DISPLY_1BIT;
dight_pin[0] = a;
dight_pin[1] = b;
dight_pin[2] = c;
dight_pin[3] = d;
dight_pin[4] = e;
dight_pin[5] = f;
dight_pin[6] = g;
dight_pin[7] = h;
dight_display[0] = DIGHT_NUMBLE(0);
dight_display[1] = DIGHT_NUMBLE(1);
dight_display[2] = DIGHT_NUMBLE(2);
dight_display[3] = DIGHT_NUMBLE(3);
dight_display[4] = DIGHT_NUMBLE(4);
dight_display[5] = DIGHT_NUMBLE(5);
dight_display[6] = DIGHT_NUMBLE(6);
dight_display[7] = DIGHT_NUMBLE(7);
dight_display[8] = DIGHT_NUMBLE(8);
dight_display[9] = DIGHT_NUMBLE(9);
for (int i = 0; i < 8; i++) {
pinMode(dight_pin[i], OUTPUT); //set all led diplay array pin output mode
digitalWrite(dight_pin[i], LOW);
}
}
SegmentDisplay::SegmentDisplay(
uint8_t a, uint8_t b, uint8_t c, uint8_t d, uint8_t e, uint8_t f, uint8_t g, uint8_t h,
uint8_t d1, uint8_t d2, uint8_t d3, uint8_t d4
)
{
mode = SEGMENT_DISPLY_4BIT;
dight_pin[0] = a;
dight_pin[1] = b;
dight_pin[2] = c;
dight_pin[3] = d;
dight_pin[4] = e;
dight_pin[5] = f;
dight_pin[6] = g;
dight_pin[7] = h;
dight_display[0] = DIGHT_NUMBLE(0);
dight_display[1] = DIGHT_NUMBLE(1);
dight_display[2] = DIGHT_NUMBLE(2);
dight_display[3] = DIGHT_NUMBLE(3);
dight_display[4] = DIGHT_NUMBLE(4);
dight_display[5] = DIGHT_NUMBLE(5);
dight_display[6] = DIGHT_NUMBLE(6);
dight_display[7] = DIGHT_NUMBLE(7);
dight_display[8] = DIGHT_NUMBLE(8);
dight_display[9] = DIGHT_NUMBLE(9);
dight_select_pin[0] = d1;
dight_select_pin[1] = d2;
dight_select_pin[2] = d3;
dight_select_pin[3] = d4;
for (int i = 0; i < 8; i++) {
pinMode(dight_pin[i], OUTPUT); //set all led diplay array pin output mode
digitalWrite(dight_pin[i], LOW);
}
for (int i = 0; i < 4; i++) {
pinMode(dight_select_pin[i], OUTPUT); //set all led diplay array pin output mode
digitalWrite(dight_select_pin[i], LOW);
}
}
void SegmentDisplay::TurnOffAllLed(void)
{
for (int i = 0; i < 8; i++)
digitalWrite(dight_pin[i], HIGH);
if (mode == SEGMENT_DISPLY_4BIT) {
for (int i = 0; i < 4; i++)
digitalWrite(dight_select_pin[i], LOW);
}
}
void SegmentDisplay::numble2dis(int numble)
{
int numble_bit = 0;
int bit_base = 1000;
for (numble_bit = 0; numble_bit < 4; numble_bit++ )
{
if (numble/bit_base != 0)
{
display_array[numble_bit] = numble/bit_base; // integer date convert to ASCII
numble = numble%bit_base;
}else
{
display_array[numble_bit] = 0; // led display none
}
bit_base = bit_base / 10;
}
}
void SegmentDisplay::DisplayChar(byte n)
{
byte ch = dight_display[n];
if (n < 10) {
for (byte i = 0; i < 8; i++) {
if (ch & (1 << i)) {
digitalWrite(dight_pin[i], HIGH);
} else {
digitalWrite(dight_pin[i], LOW);
}
}
}
}
void SegmentDisplay::DisplayChar(int n)
{
if (mode == SEGMENT_DISPLY_4BIT) {
numble2dis(n);
for(int i = 0; i < 4; i++) {
DisplayChar((byte)display_array[i]);
digitalWrite(dight_select_pin[i], HIGH);
delay(5);
digitalWrite(dight_select_pin[i], LOW); // you must turn off
}
}
}
void SegmentDisplay::DisplayChar(byte sel, byte n)
{
byte ch = dight_display[n];
for (byte i = 0; i < 8; i++) {
if (ch & (1 << i)) {
digitalWrite(dight_pin[i], HIGH);
} else {
digitalWrite(dight_pin[i], LOW);
}
}
digitalWrite(dight_select_pin[sel] ,HIGH );
}
2. 效果演示
数码管温度
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