Difference between revisions of "Matrix - Temperature and Humidity Sensor"
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==Introduction== | ==Introduction== | ||
[[File:TemperatureAndHumiditySensor01.png|thumb|Temperature and Humidity Sensor]] | [[File:TemperatureAndHumiditySensor01.png|thumb|Temperature and Humidity Sensor]] | ||
| − | This module utilizes the DHT11 temperature and humidity sensor. The DHT11 sensor's relative humidity range is 20%-80% ±5% and its temperature range is 0℃-50℃ ±2℃. | + | This module utilizes the DHT11 temperature and humidity sensor. The DHT11 sensor's relative humidity range is 20%-80% ±5% and its temperature range is 0℃-50℃ ±2℃. DHT11's DATA is a single bus which needs only a single I/O. 线用于微处理器与 DHT11之间的通讯和同步,采用单总线数据格式, 仅仅需要一个 I/O 口，一次通讯时间4ms左右,数据分小数部分和整数部分，数据采用校验和方式进行校验。它应用专用的数字模块采集技术和温湿度传感技术，超小的体积、极低的功耗，信号传输距离可达20米以上。适合要求不高的场合使用。我们把DHT11的4针引脚简化为3针引出，并在PCB上加上固定孔，方便您安装使用。 |
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==特性== | ==特性== | ||
* 测量范围 湿度20-80%RH， 温度0~50℃ | * 测量范围 湿度20-80%RH， 温度0~50℃ | ||
Revision as of 08:26, 5 August 2015
1 Introduction
This module utilizes the DHT11 temperature and humidity sensor. The DHT11 sensor's relative humidity range is 20%-80% ±5% and its temperature range is 0℃-50℃ ±2℃. DHT11's DATA is a single bus which needs only a single I/O. 线用于微处理器与 DHT11之间的通讯和同步,采用单总线数据格式, 仅仅需要一个 I/O 口，一次通讯时间4ms左右,数据分小数部分和整数部分，数据采用校验和方式进行校验。它应用专用的数字模块采集技术和温湿度传感技术，超小的体积、极低的功耗，信号传输距离可达20米以上。适合要求不高的场合使用。我们把DHT11的4针引脚简化为3针引出，并在PCB上加上固定孔，方便您安装使用。
2 特性
- 测量范围 湿度20-80%RH， 温度0~50℃
- 测量精度 湿度+-5%RH， 温度+-2℃
- 一线协议
- 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
- S针脚：接GPIO PIN1, 必须使用中断引脚，可用引脚(1、2、3、4、9、10)
3.2 Linux下的C示例
#include <stdio.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 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; } printf("Using pin TINY4412_GPIO_PIN%d\n", num); } int main(int argc, char ** argv) { int ret = -1; int dhtTemp = 0; int dhtHdty = 0; int devFD = -1; int pin = TINY4412_GPIO_PIN1; if (argc == 2) { parseCmd(argc, argv, &pin); } else { printf("Using default pin TINY4412_GPIO_PIN1\n"); } if ((devFD = dht11Init(pin)) == -1) { printf("Fail to init dht11\n"); return -1; } if ((ret = dht11Read(DHT_HUMIDITY, &dhtHdty)) != -1) { printf("Get humidity : %d\n", dhtHdty); } else { printf("Faided to get humidity\n"); } if ((ret = dht11Read(DHT_TEMP, &dhtTemp)) != -1) { printf("Get temperature : %d\n", dhtTemp); } else { printf("Faided to get temperature\n"); } dht11DeInit(devFD); return ret; }
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_and_humidity_sensor make
将编译生成的dht11通过ftp上传到开发板上运行即可测试。
