Difference between revisions of "Matrix - Temperature Sensor"

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* 2.54mm spacing pin
 
* 2.54mm spacing pin
 
* PCB dimension(mm): 8 X 24
 
* PCB dimension(mm): 8 X 24
−
[[File:temppcb.png|frameless|400px|温度传感器PCB]]
+
[[File:temppcb.png|frameless|400px|Temperature Sensor PCB]]
  
  
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equates to a temperature resolution of 0.5°C, 0.25°C, 0.125°C, or 0.0625°C. Following the issuance of the Convert T [44h] command, a temperature conversion is performed and the thermal data is stored in the scratchpad memory in a 16-bit, sign-extended two’s complement format. The temperature information can be retrieved over the 1-Wire interface by issuing a Read Scratchpad [BEh] command once the conversion has been performed. The data is transferred over the 1-Wire bus, LSB first. The MSB of the temperature register contains the “sign” (S) bit, denoting whether the temperature is positive or negative.
 
equates to a temperature resolution of 0.5°C, 0.25°C, 0.125°C, or 0.0625°C. Following the issuance of the Convert T [44h] command, a temperature conversion is performed and the thermal data is stored in the scratchpad memory in a 16-bit, sign-extended two’s complement format. The temperature information can be retrieved over the 1-Wire interface by issuing a Read Scratchpad [BEh] command once the conversion has been performed. The data is transferred over the 1-Wire bus, LSB first. The MSB of the temperature register contains the “sign” (S) bit, denoting whether the temperature is positive or negative.
  
 +
 +
==硬件连接==
 +
===连接NanoPi M1===
 +
参考下图连接模块：<br>
 +
[[File:Matrix-Temperature_Sensor_nanopi_m1.jpg|frameless|600px|Matrix-Temperature_Sensor_nanopi_m1]]
 +
 +
连接说明：
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Temperature_Sensor || NanoPi M1
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 +
===连接NanoPi 2===
 +
参考下图连接模块：<br>
 +
[[File:Matrix-Temperature_Sensor_nanopi_2.jpg|frameless|600px|Matrix-Temperature_Sensor_nanopi_2]]
 +
 +
连接说明：
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Temperature_Sensor || NanoPi 2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 +
===连接NanoPi M2 / NanoPi 2 Fire===
 +
NanoPi M2和NanoPi 2 Fire的40 Pin引脚定义是一模一样的，所以它们操作Matrix配件的步骤是一样的，这里仅以NanoPi M2为例。<br>
 +
参考下图连接模块：<br>
 +
[[File:Matrix-Temperature_Sensor_nanopi_m2.jpg|frameless|600px|Matrix-Temperature_Sensor_nanopi_m2]]
 +
 +
连接说明：
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Temperature_Sensor || NanoPi M2
 +
|-
 +
|S    || Pin7
 +
|-
 +
|V    || Pin4
 +
|-
 +
|G    || Pin6
 +
|}
 +
 +
===连接NanoPC-T2===
 +
参考下图连接模块：<br>
 +
[[File:Matrix-Temperature_Sensor_NanoPC-T2.jpg|frameless|600px|Matrix-Temperature_Sensor_NanoPC-T2]]
 +
 +
连接说明：
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Temperature_Sensor || NanoPC-T2
 +
|-
 +
|S    || Pin15
 +
|-
 +
|V    || Pin29
 +
|-
 +
|G    || Pin30
 +
|}
 +
 +
==编译运行测试程序==
 +
启动开发板并运行Debian系统，进入系统后克隆Matrix代码仓库：
 +
<syntaxhighlight lang="bash">
 +
$ apt-get update && apt-get install git
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
克隆完成后会得到一个名为matrix的目录。
 +
 +
编译并安装Matrix：
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ make && make install
 +
</syntaxhighlight>
 +
 +
运行测试程序：
 +
<syntaxhighlight lang="bash">
 +
$ matrix-temp_sensor
 +
</syntaxhighlight>
 +
注意：此模块并不支持热插拔，启动系统前需要确保硬件连接正确。<br>
 +
运行效果如下：<br>
 +
<syntaxhighlight lang="bash">
 +
The temperature is 27.312 C
 +
</syntaxhighlight>
 +
成功读取温度值。
 +
 +
==代码说明==
 +
所有的开发板都共用一套Matrix代码，本模块的测试示例代码为matrix-temperature_sensor，内容如下:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    char temperature[BUF_SIZE], modStr[BUF_SIZE];
 +
    int board;
 +
    int pin=GPIO_PIN(7);
 +
   
 +
    if ((board = boardInit()) < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
    if (board == BOARD_NANOPI_T2)
 +
        pin = GPIO_PIN(15);
 +
   
 +
    if (argc == 2)
 +
        pin = atoi(argv[1]);
 +
    sprintf(modStr, "modprobe %s gpio=%d", TEMP_GPIO_DRIVER_MODULE, pintoGPIO(pin));
 +
    printf("%s\n", modStr);
 +
    system(modStr);
 +
    system("modprobe "TEMP_DRIVER_MODULE);
 +
    sleep(1);
 +
    memset(temperature, 0, BUF_SIZE);
 +
    if (ds18b20Read(temperature) > 0) {
 +
        printf("The temperature is %.3f C\n", atoi(temperature)/1000.0);
 +
    } else {
 +
        printf("Fail to get temperature\n");       
 +
    }
 +
    system("rmmod "TEMP_GPIO_DRIVER_MODULE);
 +
    system("rmmod "TEMP_DRIVER_MODULE);
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
API说明参考维基：[[Matrix API reference manual/zh|Matrix API reference manual]] <br>
 +
 +
<!---
 
==Download Matrix Source Code==
 
==Download Matrix Source Code==
 
All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git <br>
 
All the matrix modules' code samples are open source. They are maintained on GitHub - https://github.com/friendlyarm/matrix.git <br>
Line 296: Line 425:
  
 
==Connect to Arduino==
 
==Connect to Arduino==
−
 
+
--->
 
==Resources==
 
==Resources==
 
[http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf DS18B20.pdf]
 
[http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf DS18B20.pdf]

Revision as of 15:53, 24 June 2016

查看中文

1 Introduction

Temperature Sensor
  • The matrix-temperature_sensor module is used to measure temperature.
  • We utilitze the DS18B20 chip with the To-92 package in this module. Its unique 1-wire interface requires only 1 port pin for reading/writing. Power for reading, writing, and performing temperature conversions can be derived from the data line itself with no need for an external power source. The DS18B20 can be powered from its data line. Each DS18B20 is assigned a unique ID.
  • Its temperature range is -55 degree Celsius to +125 degree Celsius. The thermometer resolution is programmable from 9 to 12 bits. When the measured temperature is between -10 degree Celsius to +85 degree Celsius the accuracy can be at 0.5 degree. Among all three DS18B20 pins V is power, G is ground and S is data.

2 Features

  • -55 degree Celsius to +125 degree Celsius
  • One wire interface for communication
  • Tiny, easy to be deployed in various situations
  • 2.54mm spacing pin
  • PCB dimension(mm): 8 X 24

Temperature Sensor PCB


  • Pin Description:
Pin Description
S GPIO
V Supply Voltage 5V
G Ground

3 Basic Device Operation

The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the DS18B20 is configurable (9, 10, 11, or 12 bits), with 12-bit readings the factory default state. This equates to a temperature resolution of 0.5°C, 0.25°C, 0.125°C, or 0.0625°C. Following the issuance of the Convert T [44h] command, a temperature conversion is performed and the thermal data is stored in the scratchpad memory in a 16-bit, sign-extended two’s complement format. The temperature information can be retrieved over the 1-Wire interface by issuing a Read Scratchpad [BEh] command once the conversion has been performed. The data is transferred over the 1-Wire bus, LSB first. The MSB of the temperature register contains the “sign” (S) bit, denoting whether the temperature is positive or negative.


4 硬件连接

4.1 连接NanoPi M1

参考下图连接模块：
Matrix-Temperature_Sensor_nanopi_m1

连接说明：

Matrix-Temperature_Sensor NanoPi M1
S Pin7
V Pin4
G Pin6

4.2 连接NanoPi 2

参考下图连接模块：
Matrix-Temperature_Sensor_nanopi_2

连接说明：

Matrix-Temperature_Sensor NanoPi 2
S Pin7
V Pin4
G Pin6

4.3 连接NanoPi M2 / NanoPi 2 Fire

NanoPi M2和NanoPi 2 Fire的40 Pin引脚定义是一模一样的，所以它们操作Matrix配件的步骤是一样的，这里仅以NanoPi M2为例。
参考下图连接模块：
Matrix-Temperature_Sensor_nanopi_m2

连接说明：

Matrix-Temperature_Sensor NanoPi M2
S Pin7
V Pin4
G Pin6

4.4 连接NanoPC-T2

参考下图连接模块：
Matrix-Temperature_Sensor_NanoPC-T2

连接说明：

Matrix-Temperature_Sensor NanoPC-T2
S Pin15
V Pin29
G Pin30

5 编译运行测试程序

启动开发板并运行Debian系统，进入系统后克隆Matrix代码仓库： 

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

克隆完成后会得到一个名为matrix的目录。

编译并安装Matrix： 

$ cd matrix
$ make && make install

运行测试程序： 

$ matrix-temp_sensor

注意：此模块并不支持热插拔，启动系统前需要确保硬件连接正确。
运行效果如下：

The temperature is 27.312 C

成功读取温度值。

6 代码说明

所有的开发板都共用一套Matrix代码，本模块的测试示例代码为matrix-temperature_sensor，内容如下: 

int main(int argc, char ** argv)
{
    char temperature[BUF_SIZE], modStr[BUF_SIZE];
    int board;
    int pin=GPIO_PIN(7);
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
    if (board == BOARD_NANOPI_T2)
        pin = GPIO_PIN(15);
 
    if (argc == 2)
        pin = atoi(argv[1]);
    sprintf(modStr, "modprobe %s gpio=%d", TEMP_GPIO_DRIVER_MODULE, pintoGPIO(pin));
    printf("%s\n", modStr);
    system(modStr);
    system("modprobe "TEMP_DRIVER_MODULE);
    sleep(1);
    memset(temperature, 0, BUF_SIZE);
    if (ds18b20Read(temperature) > 0) {
        printf("The temperature is %.3f C\n", atoi(temperature)/1000.0);
    } else {
        printf("Fail to get temperature\n");        
    }
    system("rmmod "TEMP_GPIO_DRIVER_MODULE);
    system("rmmod "TEMP_DRIVER_MODULE);
    return 0;
}

API说明参考维基：Matrix API reference manual

7 Resources

DS18B20.pdf

8 Update Log

8.1 Feb-23-2016

  • Added the description for "NanoPi 2 branch" in Section 4
  • Added Section 5: Connect to NanoPi 2


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