DS18B20温度传感器程序设计
时间: 2023-10-22 15:08:56 浏览: 69
好的,关于DS18B20温度传感器程序设计,可以提供一些基本的思路和代码实现。DS18B20是一种数字式温度传感器,可以采用1-Wire接口进行通讯。在程序设计中,需要先初始化1-Wire总线,然后发送指令读取传感器的温度值,并进行相应的数据转换和计算。以下是一个简单的C语言程序示例:
```
#include <stdio.h>
#include <wiringPi.h>
#define DS18B20_PIN 7 // GPIO 4
void ds18b20_init()
{
wiringPiSetup();
pinMode(DS18B20_PIN, OUTPUT);
digitalWrite(DS18B20_PIN, HIGH);
}
void ds18b20_read(float *temperature)
{
unsigned char data[9];
unsigned char i;
int temp;
digitalWrite(DS18B20_PIN, LOW);
delayMicroseconds(480);
digitalWrite(DS18B20_PIN, HIGH);
delayMicroseconds(40);
pinMode(DS18B20_PIN, INPUT);
while (digitalRead(DS18B20_PIN) == 1);
delayMicroseconds(80);
if (digitalRead(DS18B20_PIN) == 0) {
delayMicroseconds(80);
for (i = 0; i < 9; i++) {
data[i] = 0;
for (j = 0; j < 8; j++) {
bit = 0;
digitalWrite(DS18B20_PIN, LOW);
delayMicroseconds(2);
digitalWrite(DS18B20_PIN, HIGH);
delayMicroseconds(12);
bit = digitalRead(DS18B20_PIN);
delayMicroseconds(50);
data[i] |= (bit << j);
}
}
temp = (data[1] << 8) | data[0];
if (temp & 0x8000) {
temp = ~temp + 1;
*temperature = -1.0 * (float)temp / 16.0;
} else {
*temperature = (float)temp / 16.0;
}
}
pinMode(DS18B20_PIN, OUTPUT);
digitalWrite(DS18B20_PIN, HIGH);
}
int main()
{
float temperature;
ds18b20_init();
while (1) {
ds18b20_read(&temperature);
printf("Temperature: %.2f\n", temperature);
delay(1000);
}
return 0;
}
```
以上代码仅供参考,具体实现需要根据具体情况进行调整。
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