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README
Apache-2.0

BH1750FVI 传感器驱动软件包

1 介绍

BH1750FVI 传感器软件包提供了使用光照强度传感器 BH1750FVI 基本功能,BH1750FVI 是一种用于两线式串行总线接口的数字型光强度传感器集成电路。这种集成电路可以根据收集的光线强度数据来调整液晶或者键盘背景灯的亮度。利用它的高分辨率可以探测较大范围的光强度变化。(1lx-65535lx)。本文介绍该软件包的基本功能,以及 Finsh/MSH 测试命令等,这里我做了两个版本的软件包,新版是基于sensor框架,目前最新版本(latest)的是基于sensor框架的,以下介绍的是使用基于sensor框架新版本软件包使用方法,旧版本(非sensor框架)使用方法在:https://github.com/sanjaywu/bh1750_sensor/blob/bh1750-v1.0.0/old_readme.md

基本功能主要由传感器 BH1750FVI 决定:在输入电压为 2.4v-3.6v 范围内,测量光照强度的量程如下表所示:

功能 量程
光照强度 1lx - 65535lx

BH1750FVI 的分辨率以及测量时间都与测量模式有关,具体如下表所示:

测量模式 测量时间 分辨率
H-resolution Mode2 Typ. 120ms. 0.5 lx
H-resolution Mode Typ. 120ms. 1 lx
L-resolution Mode Typ. 16ms. 4 lx

1.1 目录结构

名称 说明
bh1750.h、sensor_rohm_bh1750.h 传感器使用头文件
bh1750.c、sensor_rohm_bh1750.c 传感器使用源代码
SConscript RT-Thread 默认的构建脚本
README.md 软件包使用说明
BH1750FVI_datasheet.pdf 官方数据手册

1.2 许可证

BH1750FVI 传感器软件包遵循 Apache-2.0 许可,详见 LICENSE 文件。

1.3 依赖

依赖 RT-Thread I2C 设备驱动框架。

2 获取软件包

使用 BH1750FVI 软件包需要在 RT-Thread 的包管理器中选择它,具体路径如下:

RT-Thread online packages --->
    peripheral libraries and drivers --->
        sensors drivers --->
              [*]   bh1750 sensor driver package, support: ambient light.  --->
                   	Version (latest)  --->

每个功能的配置说明如下:

  • bh1750 sensor driver package, support: ambient light:选择使用 BH1750FVI 传感器软件包;
  • Version:配置软件包版本,默认最新版本;
  • 版本说明:v1.0.0版本是旧版本(非sensor框架)、v2.0.0latest是新版本(基于sensor框架)。

然后让 RT-Thread 的包管理器自动更新,或者使用 pkgs --update 命令更新包到 BSP 中。

3 使用基于sensor框架软件包

按照前文介绍,如果你获取的是v2.0.0latest版本,使用的是sensor框架,在获取 BH1750FVI 软件包后,就可以按照下文提供的 API 使用传感器 bh1750Finsh/MSH 命令进行测试,详细内容如下。

3.1 API

BH1750FVI 软件包初始化函数如下所示:

int rt_hw_bh1750_init(const char *name, struct rt_sensor_config *cfg);

该函数需要由用户调用,函数主要完成的功能有,

  • 设备配置和初始化(根据传入的配置信息,配置接口设备);
  • 注册相应的传感器设备,完成 bh1750 设备的注册;

3.2 初始化示例

int bh1750_port(void)
{
    struct rt_sensor_config cfg;

    cfg.intf.dev_name = "i2c2";		//根据传感器所挂的I2C设备修改
    cfg.intf.user_data = (void *)BH1750_ADDR;
    cfg.irq_pin.pin = RT_PIN_NONE;

    rt_hw_bh1750_init("bh1750", &cfg);
	
    return 0;
}
INIT_APP_EXPORT(bh1750_port);

在使用该传感器前,需进行如上的初始,cfg.intf.dev_name = "i2c2";根据所挂载的i2c修改,初始化成功开机会打印如下信息:

 \ | /
- RT -     Thread Operating System
 / | \     4.0.1 build Apr 30 2019
 2006 - 2019 Copyright by rt-thread team
[I/sensor] rt_sensor init success
[I/sensor.rohm.bh1750] light sensor init success
msh >

3.3 Finsh/MSH 测试命令

BH1750FVI 软件包提供了丰富的测试命令,项目只要在 RT-Thread 上开启 Finsh/MSH 功能即可。在做一些基于 BH1750FVI 的应用开发、调试时,这些命令会非常实用,它可以准确的读取传感器测量的光照强度。

3.3.1、输入list_device

msh >list_device
device           type         ref count
-------- -------------------- ----------
li_bh175 Sensor Device        1
i2c2     I2C Bus              0
uart1    Character Device     2
pin      Miscellaneous Device 0
msh >

查看到对应设备以及注册成功。

3.3.2、输入sensor probe li_bh1750

msh >sensor probe li_bh1750
[I/sensor.cmd] device id: 0xff!
msh >

3.3.3、输入sensor read

msh >sensor read
[I/sensor.cmd] num:  0, light: 494.1, timestamp:2647042
[I/sensor.cmd] num:  1, light: 495.0, timestamp:2647268
[I/sensor.cmd] num:  2, light: 495.0, timestamp:2647494
[I/sensor.cmd] num:  3, light: 490.8, timestamp:2647720
[I/sensor.cmd] num:  4, light: 490.8, timestamp:2647946
msh >

读取到光照强度数据,单位:lux。

4 注意事项

如果使用基于sensor框架的软件包(v2.0.0latest版本),在执行sensor read之后没有任何打印出光照强度数据,打开\components\drivers\sensors\sensor_cmd.c,在sensor_show_data函数后面自行增加环境光照强度打印代码:

case RT_SENSOR_CLASS_LIGHT:
        LOG_I("num:%3d, light:%4d.%d, timestamp:%5d", num, sensor_data->data.light / 10, sensor_data->data.light % 10, sensor_data->timestamp);
        break;

5 联系方式

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