简 介： 使用ESP32读取BH1750的光度传感器的数据。但是最终不知道甚么原因，所读取的数据都是0 ？
后面通过证明，说明在原来进行I2C写的时候出现了语法错误。

关键词： BH1750，ESP32

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光度传感器
文章目录
实验背景
实验方案
测试BH1750
基本I2C总线操作
读取数据
测试结果

§01 光度传感器

  在今天（2021-09-24 16:40:56）测试了 接近光电开关DF-11N 光强的基本特征。看到在之前的光度传感器BH1750模块。下面利用ESP32 MicroPython完成对其驱动，以备之后实验使用。

一、实验背景

1、光度传感器BH1750

  在 强度光照模块rimg02 BH1750光度传感器模块 使用了STC单片机测试了对于光度传感器 BH1750 的数据初步实验。在这次试验中，利用BH1750在普通环境下测量了光度大约为几百的数值。在 使用BH1750测量激光发射器的强度 测试了激光发射器的光斑的光强度。

  很可惜在上面几个实验中，并没有对于BH1750测量数据并没有得到进一步分析，比如噪声，数值标定等。

▲ 图1.1.1 转换速度

2、MicroPython I2C

在 龙邱MPU9250传感器 | 使用ESP32 模块进行测试 测试了 ESP32 MicroPython实验模块 测试了 MicroPython的软件I2C功能对于IMU 9250的数据读取功能。那么在本实验中利用ESP32对于BH1750的I2C访问，来访问光度数据。

二、实验方案

1、管脚配置

ESP32 I2C管脚配置：
SCL：GPIO15
SDA：GPIO2

▲ 图1.2.1 实验管脚配置

2、搭建实验平台

  下面是利用面包板搭建的实验电路。利用两个 4.7kΩ电阻对于SCL，SDA进行上拉到3.3V电压。

▲ 图1.2.2 利用面包板搭建的实验电路

§02 测试BH1750

一、基本I2C总线操作

1、I2C扫描

(1) 实验代码

from machine                import Pin,SoftI2C,Timer
import timei2c = SoftI2C(scl=Pin(15), sda=Pin(2), freq=100000)
scan = i2c.scan()
print(scan)

(2) 扫描结果

  程序运行输出结果：

[35]

(3) 结果分析

  根据BH1750的读取协议，可以看到它的的地址应该是 0x23，这与读出的数值35是相同的。

▲ 图2.1.1 BH1750读取协议

二、读取数据

1、读取H-Resolution数据

  根据前面给出的Continuously H-resolution读取协议，利用I2C读取相应的数据。

(1) 实验代码

from machine                import Pin,SoftI2C,Timer
import time
i2c = SoftI2C(scl=Pin(16), sda=Pin(17), freq=100000)
str = i2c.scan()
print('%x'%str[0])BH1750_CMD_POWERDOWN        = 0x0
BH1750_CMD_POWERON          = 0x1
BH1750_CMD_RESET            = 0x7
BH1750_CMD_H_RESOLUTION     = 0x10
BH1750_CMD_H_RESOLUTION2    = 0x11
BH1750_CMD_L_RESOLUTION     = 0x13
BH1750_CMD_ONETIME_H        = 0x20
BH1750_CMD_ONETIME_H2       = 0x21
BH1750_CMD_ONETIME_L        = 0x23BH1750_I2C_ADD  = 0x23buf = bytearray(1)
buf[0] = BH1750_CMD_H_RESOLUTIONi2c.writeto(BH1750_I2C_ADD, buf)
time.sleep_ms(200)while True:buf = i2c.readfrom(BH1750_I2C_ADD, 0x2)data = buf[0] * 256 + buf[1]print(data)time.sleep_ms(200)

(2) 读取数据波形

▲ 图2.2.1 SDA， SCL波形

(3) 读取数据

▲ 图2.2.2 读取的数据

※ 测试结果 ※

  不知道为什么，最终使用ESP32 没有能够读取BH1750的数据。读出的数据都是0.

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2021-09-25
#
# Note:
#============================================================
from machine                import Pin,SoftI2C,Timer
import time
i2c = SoftI2C(scl=Pin(16), sda=Pin(17), freq=100000)
str = i2c.scan()
print('%x'%str[0])
#------------------------------------------------------------
BH1750_CMD_POWERDOWN        = 0x0
BH1750_CMD_POWERON          = 0x1
BH1750_CMD_RESET            = 0x7
BH1750_CMD_H_RESOLUTION     = 0x10
BH1750_CMD_H_RESOLUTION2    = 0x11
BH1750_CMD_L_RESOLUTION     = 0x13
BH1750_CMD_ONETIME_H        = 0x20
BH1750_CMD_ONETIME_H2       = 0x21
BH1750_CMD_ONETIME_L        = 0x23
BH1750_I2C_ADD  = 0x23
#------------------------------------------------------------
buf = bytearray(1)
buf[0] = BH1750_CMD_H_RESOLUTION
i2c.writeto(BH1750_I2C_ADD, buf)
time.sleep_ms(200)
#------------------------------------------------------------
while True:buf = i2c.readfrom(BH1750_I2C_ADD, 0x2)data = buf[0] * 256 + buf[1]print(data)time.sleep_ms(200)
#------------------------------------------------------------
#        END OF FILE : test1.PY
#============================================================

■ 相关文献链接:

  • 接近开关的初步测试 ： DF-11N
  • 强度光照模块rimg02 BH1750光度传感器模块
  • BH1750
  • 使用BH1750测量激光发射器的强度
  • 龙邱MPU9250传感器 | 使用ESP32 模块进行测试
  • ESP32-S模块转接板设计与实现

● 相关图表链接:

  • 图1.1.1 转换速度
  • 图1.2.1 实验管脚配置
  • 图1.2.2 利用面包板搭建的实验电路
  • 图2.1.1 BH1750读取协议
  • 图2.2.1 读取数据波形

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