Difference between revisions of "Matrix - Temperature Sensor"

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Line 7: Line 7:
 
* 体积小巧， 带固定孔，方便嵌入到外壳
 
* 体积小巧， 带固定孔，方便嵌入到外壳
 
* 2.54mm排针接口，接线方便，通用性强
 
* 2.54mm排针接口，接线方便，通用性强
 +
==使用方法==
 +
===连接===
 +
*连接到Tiny4412 SDK (1506)
 +
::GND针脚:    接地
 +
::VCC:  接5V
 +
 +
===Linux下的C示例===
 +
<syntaxhighlight lang="c">
 +
#include <stdio.h>
 +
#include <string.h>
 +
#include <stdlib.h>
 +
#include "libfahw.h"
 +
 +
void parseCmd(int argc, char **argv, int *pin)
 +
{
 +
    int num = atoi(argv[1]);
 +
    switch(num) {
 +
    case 1:
 +
        *pin = TINY4412_GPIO_PIN1;
 +
        break;
 +
    case 2:
 +
        *pin = TINY4412_GPIO_PIN2;
 +
        break;
 +
    case 3:
 +
        *pin = TINY4412_GPIO_PIN3;
 +
        break;
 +
    case 4:
 +
        *pin = TINY4412_GPIO_PIN4;
 +
        break;
 +
    case 5:
 +
        *pin = TINY4412_GPIO_PIN5;
 +
        break;
 +
    case 6:
 +
        *pin = TINY4412_GPIO_PIN6;
 +
        break;
 +
    case 7:
 +
        *pin = TINY4412_GPIO_PIN7;
 +
        break;
 +
    case 8:
 +
        *pin = TINY4412_GPIO_PIN8;
 +
        break;
 +
    case 9:
 +
        *pin = TINY4412_GPIO_PIN9;
 +
        break;
 +
    case 10:
 +
        *pin = TINY4412_GPIO_PIN10;
 +
        break;
 +
    default:
 +
        printf("Unsupported pin TINY4412_GPIO_PIN%d\n", num);
 +
        num = 1;
 +
        *pin = TINY4412_GPIO_PIN1;
 +
"ds18b20.c" 73L, 1631C                                                                                              1,1          顶端
 +
        num = 1;
 +
        *pin = TINY4412_GPIO_PIN1;
 +
    }
 +
    printf("Using pin TINY4412_GPIO_PIN%d\n", num);
 +
}
 +
 +
int main(int argc, char ** argv)
 +
{
 +
    int devFD = -1;
 +
    int pin = TINY4412_GPIO_PIN1;
 +
    char *temperature = (char *) malloc(32);
 +
    memset(temperature, 0, 32);
 +
 +
    if (argc == 2) {
 +
        parseCmd(argc, argv, &pin);
 +
    } else {
 +
        printf("Using default pin TINY4412_GPIO_PIN1\n");
 +
    }
 +
 +
    if ((devFD = ds18b20Init(pin)) == -1) {
 +
        printf("Fail to init ds18b20\n");
 +
        return -1;
 +
    }
 +
    if (ds18b20Read(temperature) > 0) {
 +
        printf("Temperature = %s\n", temperature);
 +
    } else {
 +
        printf("Fail to get temperature\n");
 +
    }
 +
    free(temperature);
 +
    ds18b20DeInit(devFD);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
 +
===编译并运行示例===
 +
<syntaxhighlight lang="bash">
 +
git clone http://github.com/friendlyarm/fa-hardware.git
 +
cd fa-hardware
 +
cd demo
 +
cd matrix-temperature_sensor
 +
make
 +
</syntaxhighlight>
 +
将编译生成的ds18b20通过ftp上传到开发板上运行即可测试。
 +
 +
==相关资料==

Revision as of 08:03, 27 July 2015

1 介绍

Temperature Sensor

非常流行的TO-92封装的DS18B20。DS18B20的测量范围是-55摄氏度到+125摄氏度，可选9-bit或12-bit，在-10摄氏度到+85摄氏度时可以精确到0.5度，采用一线协议通讯。我们把DS18B20的3个针脚全部引出，V对应电源引脚，G对应地引脚，S对应数据引脚。

2 特性

  • -55摄氏度到+125摄氏度
  • 一线协议
  • 体积小巧， 带固定孔，方便嵌入到外壳
  • 2.54mm排针接口，接线方便，通用性强

3 使用方法

3.1 连接

  • 连接到Tiny4412 SDK (1506)
GND针脚: 接地
VCC: 接5V

3.2 Linux下的C示例

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "libfahw.h"
 
void parseCmd(int argc, char **argv, int *pin)
{
    int num = atoi(argv[1]);
    switch(num) {
    case 1:
        *pin = TINY4412_GPIO_PIN1;
        break;
    case 2:
        *pin = TINY4412_GPIO_PIN2;
        break;
    case 3:
        *pin = TINY4412_GPIO_PIN3;
        break;
    case 4:
        *pin = TINY4412_GPIO_PIN4;
        break;
    case 5:
        *pin = TINY4412_GPIO_PIN5;
        break;
    case 6:
        *pin = TINY4412_GPIO_PIN6;
        break;
    case 7:
        *pin = TINY4412_GPIO_PIN7;
        break;
    case 8:
        *pin = TINY4412_GPIO_PIN8;
        break;
    case 9:
        *pin = TINY4412_GPIO_PIN9;
        break;
    case 10:
        *pin = TINY4412_GPIO_PIN10;
        break;
    default:
        printf("Unsupported pin TINY4412_GPIO_PIN%d\n", num);
        num = 1;
        *pin = TINY4412_GPIO_PIN1;
"ds18b20.c" 73L, 1631C                                                                                               1,1          顶端
        num = 1;
        *pin = TINY4412_GPIO_PIN1;
    }
    printf("Using pin TINY4412_GPIO_PIN%d\n", num);
}
 
int main(int argc, char ** argv)
{
    int devFD = -1;
    int pin = TINY4412_GPIO_PIN1;
    char *temperature = (char *) malloc(32);
    memset(temperature, 0, 32);
 
    if (argc == 2) {
        parseCmd(argc, argv, &pin);
    } else {
        printf("Using default pin TINY4412_GPIO_PIN1\n");
    }
 
    if ((devFD = ds18b20Init(pin)) == -1) {
        printf("Fail to init ds18b20\n");
        return -1;
    }
    if (ds18b20Read(temperature) > 0) {
        printf("Temperature = %s\n", temperature);
    } else {
        printf("Fail to get temperature\n");
    }
    free(temperature);
    ds18b20DeInit(devFD);
    return 0;
}

3.3 编译并运行示例

git clone http://github.com/friendlyarm/fa-hardware.git
cd fa-hardware
cd demo
cd matrix-temperature_sensor
make

将编译生成的ds18b20通过ftp上传到开发板上运行即可测试。

4 相关资料

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