自制简易加湿器（PCB版）

PCB做出来了

下面是效果图：

 原理图：

 PCB layout：

 进度慢，没辙，课程压力太大了（作者菜）

PCB版本的改进了按键检测机制：添加了外部中断

下面是代码：

#include 
#include 
#include "U8glib.h"
//#include 
#define DHTpin 4 //自己按需求修改
#define Red_led 8
#define key_1 2
#define key_2 3
#define relay 5
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE);// 初始化i2c接口
SimpleDHT11 dht11(DHTpin);//初始化DHT11对象

String tmp;   
String hmp;
String KHS = "60";//显示阈值
int KH=60;        //实际阈值
void draw_hello(void) {
  u8g.setFont(u8g_font_unifont);
  u8g.drawStr( 0, 22, "Hello Baby!");
  
}

void draw_data(void) {
  //具体显示屏显示内容
  u8g.setFont(u8g_font_unifont);//设置字体
  u8g.drawStr( 0, 16, tmp.c_str());//写入字符串
  u8g.drawStr( 0, 32, hmp.c_str());
  u8g.drawStr( 15, 48, KHS.c_str());
}

void setup() {
  // put your setup code here, to run once:
  /*GPIO初始化*/
  pinMode(Red_led,OUTPUT);
  //pinMode(8, OUTPUT);//不知道干啥的
  pinMode(key_1,INPUT);
  pinMode(key_2,INPUT);
  pinMode(relay,OUTPUT);
  attachInterrupt( digitalPinToInterrupt(key_1), KEY1DOWN, CHANGE);
  attachInterrupt( digitalPinToInterrupt(key_2), KEY2DOWN, CHANGE);
  /*串口初始化*/
  Serial.begin(115200);
  draw_hello();
  delay(1500);
  /*Here is nothing！！*/
  /*这是一个空行*/
  // flip screen, if required
  // u8g.setRot180();
  // set SPI backup if required
  //u8g.setHardwareBackup(u8g_backup_avr_spi);
  // assign default color value
  
  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
    u8g.setColorIndex(255);     // white
  }
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) {
    u8g.setColorIndex(3);         // max intensity
  }
  
  else if ( u8g.getMode() == U8G_MODE_BW ) {
    u8g.setColorIndex(1);         // pixel on
  }
  
  else if ( u8g.getMode() == U8G_MODE_HICOLOR ) {
    u8g.setHiColorByRGB(255,255,255);
  }
  
}

void loop() {
  /*led指示灯闪烁*/
  digitalWrite(Red_led,HIGH);
  delay(500);
  digitalWrite(Red_led,LOW);
  delay(500);
  //draw_hello();
  //delay(1200);
  /*DHT11读取并串口打印显示*/

  byte temperature = 0;
  byte humidity = 0;
  byte humidity_last = 0;
  int err = SimpleDHTErrSuccess;
  if ((err = dht11.read(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
    Serial.print("Read DHT11 failed, err="); Serial.println(err);delay(1000);
    return;
  }
  humidity_last = humidity;         
  //字符串拼接
  tmp += String("Temperature:");
  tmp += String(temperature);
  tmp += String("*C");

  hmp += String("Humidity:  ");
  hmp += String(humidity);
  hmp += String("RH%");
  Serial.print((int)temperature); Serial.print(" *C, "); 
  Serial.print((int)humidity); Serial.println(" H");
  if(humidity=KH){
    //digitalWrite(A0,HIGH);
    digitalWrite(relay,LOW);
  }
  /*oled显示屏显示程序*/
  u8g.firstPage();  
  do {
    if(humidity != humidity_last){
      u8g.drawStr( 0, 16, tmp.c_str());
      u8g.drawStr( 0, 32, "                ");
      delay(1000);
    }
    draw_data();
  } while( u8g.nextPage() );
}

void KEY1DOWN(){
    KH++;
    KHS=String(KH);
}

void KEY2DOWN(){
    KH--;
    KHS=String(KH);
}