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This is uv driver for HaaS Python. HaaS Python is forked from micropython.

Project description

HaaS Python介绍

HaaS Python是阿里云IoT团队最新研发的一套低代码编程框架,兼容MicroPython编程规范,依托HaaS平台软硬件积木提供AI、支付、蓝牙配网、云连接、UI等物联网场景常用的能力,从而解决了物联网应用开发难的问题。有了Python轻应用框架,物联网编程不再局限于专业软件开发人员,一般的技术员也可以快速实现复杂的物联网需求。 更多HaaS Python介绍和开发资料见HaaS Python官网,创意案例, 硬件积木

HaaS Python is a set of low-code programming frameworks newly developed by Alibaba Cloud IoT team. It is compatible with MicroPython programming specifications. It relies on the hardware and software building blocks of the HaaS platform to provide capabilities commonly used in IoT scenarios such as AI, payment, Bluetooth network configuration, cloud connection, and UI. Solve the difficult problem of IoT application development. With the Python light application framework, IoT programming is no longer limited to professional software developers, and general technicians can quickly implement complex IoT requirements. For more HaaS Python introduction and development materials, see HaaS Python official website, Creative Case, Hardware Building Blocks

安装方法

Download the firmware corresponding to the development board at HaaS Python website and complete the firmware burning

  • 在开发板上运行以下命令完成安装和使用,如果您在使用过程中遇到问题,欢迎在github上向我们提交issue,我们的工程师会及时解答

Run the following commands on the development board to complete the installation and use. If you encounter problems during use, please submit an issue to us on github, Our engineers will answer in time

import upip
upip.install("haas-python-uv")
import haas-python-uv

紫外线传感器 - uv

一、产品简介

紫外线是电磁波谱中波长从10nm到400nm辐射的总称。波长的不同,一般把紫外线分为A、B、C三个波段,具体如下:

  • UVA:400~315 nm
  • UVB:315~280 nm
  • UVC:280~100 nm

紫外线传感器可以利用光敏元件通过光伏模式和光导模式将紫外线信号转换为可测量的电信号,然后通过对电信号进行转换得出紫外线的强度。紫外线传感器常用在环境监测、气象监测、农业、林业等环境中测量大气中以及人造光源等环境下的紫外线强度。其具有高灵敏度、高输 出、高响应速度等特性 , 并且抗干扰能力强 、稳定可靠 、寿命长 、耗电少。

本文介绍的紫外线传感器外如下图所示:

其管脚定义如下表所示:

管脚名称 管脚功能 说明
VCC 电源 3.3V-5V
GND -
OUT 紫外线测量结果输出 01.1V,分别对应111级

二、紫外线传感器技术参数

  • 工作电压:3.0v~5v
  • 输出电压:01.1V(对应111级)
  • 响应波长:200nm~370nm
  • 测量精度:+-1UV
  • 工作温度:-20°C~+85°C
  • 通信接口:ADC
  • 响应时间:<0.5秒
  • 工作电流:0.06~0.1mA
  • 尺寸:19.8mm * 15mm

三、软件接口

紫外线传感器HaaS Python驱动:下载地址

UV(adcObj) - 创建UV传感器驱动对象

  • 函数原型:

gyroDev = UV(adcObj)

  • 参数说明:
参数 类型 必选参数? 说明
adcObj ADC 调用此函数前需确保adcObj对象已经处于open状态
  • 返回值: 执行成功,返回紫外线传感器对象;创建失败,抛出Exception

  • 示例代码:

from driver import ADC

adcObj = ADC()
adcObj.open("uvSensor")

UVDev = UV(adcObj)           # 创建UV传感器对象
print('UV device init done')
  • 输出:
UV device init done

measureUVLevel - 测量紫外线级别

  • 函数原型:

UV.measureUVLevel()

  • 参数说明: 无

  • 返回值: 返回紫外线的级别,单位:mV,范围:0~1.1。

  • 示例代码:

from driver import ADC

adcObj = ADC()
adcObj.open("uvSensor")

UVDev = UV(adcObj)
print('UV device init done')

uvLevel = UVDev.measureUVLevel()
print("UV level:%d", uvLevel)
  • 输出: 分别代表x,y,z三个方向的实际加速度测量值
UV device init done
UV level:0.1

五、工作原理

紫外线传感器又叫紫外光敏管,是一种利用光电子发射效应的光电管,它能响应并检测300nm以下紫外辐射。

目前国内外有使用价值的紫外管可以按阴极形状分为球形、丝形、平板形结构,均为二极管的电极结构形式。紫外光敏管利用阴极表面的光电子发射效应,在管内封入特殊的气体,作为放电管的工作媒介。 如果对紫外线敏管的光电阴极和阳极之间加电压,如果有紫外线透过玻壳照射到阴极上.由于阴极涂敷有电子放射物质,阴极就会发射光电子。在电场的作用下光电子被吸向阳极,光电子高速运动时与管内气体分子相碰撞而使气体分子电离,气体电离产生的电子再与气体分子相碰撞,最终使阴极和阳极间被大量的光电子和离子所充斥,引起辉光放电现象,电路中生成大的电流。当没有紫外线照射时,阴极和阳极间没有电子和离子的流动,呈现出相当高的阻抗。

参考文献及购买链接

[1] 详解紫外线传感器的三大结构分类
[2] 购买链接

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