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Author: coder-Zzx

release3.0-Uno.ino

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+//导入需要用到的液晶显示库、dht11库、json库与串口通讯库
+#include<LiquidCrystal.h>
+#include<dht11.h>
+#include<ArduinoJson.h>
+#include<SoftwareSerial.h>
+
+//预编译各个引脚
+#define DHTPIN 9
+#define INFOUT 7
+#define MQPIN 6
+
+//初始化各种对象
+/*
+   lcd的各接口：
+   rs:12
+   e:11
+   d4:5
+   d5:4
+   d6:3
+   d7:2
+*/
+LiquidCrystal lcd(12, 13, 5, 4, 3, 2);
+SoftwareSerial ArduinoSerial(11, 10);
+dht11 DHT11;
+
+//PM2.5传感器处理函数
+float PM()
+{
+  //设置PM2.5传感器相关引脚与变量
+  int measurePin = A0;
+  int ledPower = 8;
+
+  unsigned int samplingTime = 280; //3脚直接由单片机给脉冲波10ms周期，高电平0.32ms
+  unsigned int deltaTime = 40;
+  unsigned int sleepTime = 9680;
+
+  float voMeasured = 0;
+  float calcVoltage = 0;
+  float dustDensity = 0;
+
+  digitalWrite(ledPower, LOW);
+  delayMicroseconds(samplingTime);
+
+  voMeasured = analogRead(measurePin);
+
+  delayMicroseconds(deltaTime);
+  digitalWrite(ledPower, HIGH);
+  delayMicroseconds(sleepTime);
+
+  calcVoltage = voMeasured * 3.0 / 1023.0;
+  dustDensity = 0.172 * calcVoltage - 0.1;
+
+  if (dustDensity < 0)
+  {
+    dustDensity = 0.00;
+  }
+
+  Serial.println();
+  Serial.print("Raw Signal Value (0-1023):");
+  Serial.println(voMeasured);
+
+  Serial.print(" - Voltage: ");
+  Serial.println(calcVoltage);
+
+  Serial.print(" - Dust Density: ");
+  Serial.print(dustDensity * 1000);
+  Serial.println(" ug/m3");
+
+  delay(1000);
+
+  //返回实际的浓度值，单位ug/m3
+  return dustDensity * 1000;
+}
+
+//初始化各种设置
+void setup() {
+  // put your setup code here, to run once:
+  //启动串口通讯
+  ArduinoSerial.begin(9600);
+  Serial.begin(115200);
+  //初始化液晶屏各种设置
+  lcd.begin(16, 2);
+  lcd.print("Welcome!");
+  delay(1000);
+  lcd.clear();
+  //设置小灯泡的引脚
+  pinMode(INFOUT, OUTPUT);
+}
+/********************与DHT11传感器相关的数据获取********************/
+float getTemp()
+{
+  int chk = DHT11.read(DHTPIN);
+  return (float)DHT11.temperature;
+}
+
+float getHumi()
+{
+  int chk = DHT11.read(DHTPIN);
+  return (float)DHT11.humidity;
+}
+/****************************************************************/
+
+/******************分别在液晶屏和串口显示数据的函数*****************/
+void printOnLCD(float t, float h, int val, float d)
+{
+  lcd.print("tempareture:");
+  lcd.setCursor(0, 1);
+  lcd.print(t);
+  delay(2000);
+  lcd.clear();
+  lcd.print("humidity:");
+  lcd.setCursor(0, 1);
+  lcd.print(h);
+  delay(2000);
+  lcd.clear();
+  lcd.print("mq9:");
+  lcd.setCursor(0, 1);
+  lcd.print(val);
+  delay(2000);
+  lcd.clear();
+  lcd.print("Dust Density:");
+  lcd.setCursor(0, 1);
+  lcd.print(d);
+  delay(2000);
+  lcd.clear();
+}
+
+void printOnSerial(float t, float h, int val)
+{
+  Serial.println("current temperature(`C):");
+  Serial.println(t);
+  Serial.println("current humidity(%):");
+  Serial.println(h);
+  Serial.println("data from MQ-9:");
+  Serial.println(val);
+}
+/********************************************************/
+
+/***********************警报函数*************************/
+void warning(float d)
+{
+  if (d > 700)//如果PM2.5浓度大于700ug/m3就输出高电平，使蜂鸣器振动，LED灯亮
+  {
+    int i;
+    for (i = 0; i < 20; i++)
+    {
+      digitalWrite(INFOUT, HIGH);
+      delay(200);
+      digitalWrite(INFOUT, LOW);
+      delay(200);
+    }
+  }
+}
+/*******************************************************/
+
+// void infoTrans(float t,float h,float v,float d)
+// {
+//    StaticJsonDocument<500> doc;
+//  JsonObject root = doc.to<JsonObject>();
+
+//  root["temp"] = t;
+//  root["humi"] = h;
+//  root["val"] = v;
+//  root["dens"] = d;
+
+//  serializeJson(doc,ArduinoSerial);
+// }
+//测试中去掉的数据传输函数
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+/************将数据转换成json格式并发送出去**************/
+  const size_t CAPACITY = JSON_OBJECT_SIZE(20);
+/*
+ *t:温度
+ *h:湿度
+ *d:PM2.5浓度
+ *val:CO浓度
+ */
+  float t = getTemp();
+  float h = getHumi();
+  float d = PM();
+  float val = analogRead(MQPIN);
+
+  //将数据通过串口通信传输给nodeMCU.
+  StaticJsonDocument<CAPACITY> doc;
+  JsonObject root = doc.to<JsonObject>();
+
+  root["temp"] = t;
+  root["humi"] = h;
+  root["val"] = val;
+  root["dens"] = d;
+
+  serializeJson(doc, ArduinoSerial);
+/*****************************************************/
+
+  printOnLCD(t, h, val, d);
+  printOnSerial(t, h, val);
+  warning(d);
+}