Arduino 与HC-SRO4超声波传感器的OLED握手

Arduino教程传送门

1.0 简介

• 超声传感器：超声传感器是将军超声信号转换为其他能量信号(通常是电信号)传感器。超声波振动频率高于20kHz机械波。它具有频率高、波长短、绕射现象小的特点，特别是方向性好，可以成为射线和定向传播。
• 二极管有机发光（OrganicLight-Emitting Diode，OLED），又称有机电激光显示，有机发光半导体（OrganicElectroluminesence Display，OLED），是指有机半导体材料和发光材料在电场驱动下通过载流子注入和复合而发光的现象。本篇通过HC-SRO4超声传感器取样获得距离，然后通过串口和0.98寸OLED打印显示距离。LED(可以换成蜂鸣器)报警提示
  

学习超声传感技术
1.超声传感技术应用于生产实践的不同方面，医学应用是其主要应用之一。以下是超声传感技术在医学中的应用。
2.超声波在医学上的应用主要是诊断疾病，它已经成为了临床医学中不可缺少的诊断方法。超声诊断的优点是对受试者无疼痛、无损伤、方法简单、图像清晰、诊断准确性高。因此，推广容易，受到医务工作者和患者的欢迎。超声诊断可以基于不同的医学原理，让我们来看看一种具有代表性的该方法采用超声波反射。当超声波在人体组织中传播时，会产生反射回声。每次遇到反射面器的屏幕上，两个界面的阻抗差也决定了回声的振幅。

• 工作原理：
  传感器采用HC-SRO4超声波传感器传感器，信息距离（也可以判断前面是否有物体检测）；输出元件有OLED和报警LED。首先，传感器将获得从前到传感器的距离，并将其传输到Arduino，Arduino获取数据后，进行数据分析，分析距离信息OLED显示器显示，然后显示OLED字幕“Happy new year最后，展示一个爱?，希望大家有所收获。?????，动作已经优化。

• HC-SRO4超声传感器相关参数如下：

2.0 实验材料

• Arduino Uno R3开发板
• HC-SRO4超声传感器
• 0.98寸OLED
• 六根公母线
• USB数据线
• 一台安装Arduino计算机开发环境

3.0 实验步骤

3.1 根据原理图构建电路

HC-SRO4超声传感器为5V供电，其中Echo接3号，Trig接2号；OLED显示器的通信方式是IIC所以通信，除了5V在供电的两条线外，只需要一条信号线SDA（uno 的A也可以)和一个时钟线SCL（uno 的A5也可以)可以，报警LED接4号。
LE D —————— 4
Echo —————— 3
T r ig —————— 2
SD A —————— SDA（uno 的A4也可以）
SC L —————— SCL（uno 的A5也可以）
实验原理图：

实验接线图：

3.2 新建sketch，复制以下代码，保存、编译、上传

代码：
MIxly模块

Arduino IDE代码所需U8g2lib库和DHT库

 #include  #include   U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE); volatile float item; const static unsigned char FACE_Heart_large[] PROGMEM ={ 
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