Arduino自動灌溉系統

作用: 一般的灑水系統是時間自動到時灑水,但與實際狀況不符。可以利用土壤溼度計偵測土壤的溼度再予以灌溉。
材料: Arduino *1 、麵包版*1、16*2 LCD*1 、土壤溼度計*1、溫溼度計*1、繼電器*1、太陽能電子板*1、抽水馬達*1
程式:
#include
#include
#define dht_dpin A1 // 溫濕度資料腳位
LiquidCrystal_I2C lcd(0x27, 16, 2); // 顯示器
byte bGlobalErr;
byte dht_dat[5];
int relay = 10; //繼電器腳位為10

void setup() {
InitDHT();
delay(300);
lcd.begin();
lcd.backlight();
lcd.print(“Lin Shou Shan”);
pinMode(relay,OUTPUT); //定義繼電器腳位10為輸出
}

void loop() {
ReadDHT();
lcd.clear();
switch (bGlobalErr){
case 0:
String TT,HH;
HH = String(dht_dat[0])+’.’+String(dht_dat[1]);
TT = String(dht_dat[2])+’.’+String(dht_dat[3]);
lcd.setCursor(0, 0);
lcd.print(“H:”+HH+” T:”+TT); // 第一行顯示空氣溼度/溫度
}
lcd.setCursor(0, 1);
int aa;
aa = analogRead(0);
lcd.print(“Value:”+String(analogRead(0))); // 第二行顯示土壤溼度值
if (aa < 300){ // 濕度小於範圍就啟動澆水 autowatering(); } delay(10000); // 10秒執行一次 } void autowatering(){ digitalWrite(relay,HIGH); //開啟馬達 delay(5000); // 抽水三秒 digitalWrite(relay,LOW); //關閉繼電器 delay(1000); } void InitDHT(){ // 初始化溫溼度計 pinMode(dht_dpin,OUTPUT); digitalWrite(dht_dpin,HIGH); } void ReadDHT(){ bGlobalErr=0; byte dht_in; byte i; digitalWrite(dht_dpin,LOW); delay(20); digitalWrite(dht_dpin,HIGH); delayMicroseconds(40); pinMode(dht_dpin,INPUT); dht_in=digitalRead(dht_dpin); if(dht_in){ bGlobalErr=1; return; } delayMicroseconds(80); dht_in=digitalRead(dht_dpin); if(!dht_in){ bGlobalErr=2; return; } delayMicroseconds(80); for (i=0; i<5; i++) dht_dat[i] = read_dht_dat(); pinMode(dht_dpin,OUTPUT); digitalWrite(dht_dpin,HIGH); byte dht_check_sum = dht_dat[0]+dht_dat[1]+dht_dat[2]+dht_dat[3]; if(dht_dat[4]!= dht_check_sum) {bGlobalErr=3;} }; byte read_dht_dat(){ byte i = 0; byte result=0; for(i=0; i< 8; i++){ while(digitalRead(dht_dpin)==LOW); delayMicroseconds(30); if (digitalRead(dht_dpin)==HIGH) result |=(1<<(7-i)); while (digitalRead(dht_dpin)==HIGH); } return result; }

Arduino教學-使用ESP8266 wifi模組+DHT 溫溼度感測器上傳thingspeak

這是透過Arduino+ESP8266(wifi)+DHT(溫溼度感測器),實現每60秒上傳溫溼度到thingspeak網站的記錄。
一、上 Thingspeak 申請帳號,然後建立一個Channel後,然後取得Write API Key。(https://thingspeak.com)
二、DHT連線
DHT → Arduino
S → A0
+ → 5V (VCC)
– → GND
三、ESP8266
ESP8266 → Arduino
GND → GND
UTXD → RX(0)
CH_PD → 3.3V (VCC 注意:連接USB時不要接上,不然會抓不到,程式上傳後,直接用變壓器)
URXD → TX(1)
VCC → 3.3V (VCC)
四、USB轉TTL (作為監測用)
USBTTL → Arduino
TXD(綠)→ 2
RXD(白)→ 3
l_140820105419
腳位圖
20691_10152621979171541_6306184665770254413_n

11024717_10152621978966541_3990729037825987143_n

未命名 - 5
程式碼
[c]
#include <SoftwareSerial.h>
#define DEBUG
#define _baudrate 9600

// USB TTL 偵錯用
#define _rxpin 2
#define _txpin 3
SoftwareSerial debug( _rxpin, _txpin ); // RX, TX

// DHT溫溼度感測器
#define dht_dpin A0
byte bGlobalErr;
byte dht_dat[5];

// ESP8266 Wifi晶片
#define SSID "[無線分享器名稱]"
#define PASS "[無線分享器密碼]"
#define IP "184.106.153.149" // ThingSpeak的IP
// 使用 GET 傳送資料的格式
String GET = "GET /update?key=[Write API Key]";

void setup() {
InitDHT();
Serial.begin( _baudrate );
debug.begin( _baudrate );
delay(300);
sendDebug("AT");
delay(5000);
if(Serial.find("OK"))
{
debug.println("RECEIVED: OK\nData ready to sent!");
connectWiFi();
}
delay(700);
}

void loop() {
ReadDHT();
switch (bGlobalErr){
case 0:
String TT,HH;
HH = String(dht_dat[0])+’.’+String(dht_dat[1]);
TT = String(dht_dat[2])+’.’+String(dht_dat[3]);
updateDHT11( TT, HH );
#ifdef DEBUG
debug.print("Humidity: ");
debug.print( HH );
debug.print(" %\t");
debug.print("Temperature: ");
debug.print( TT );
debug.println(" *C\t");
#endif

}
delay(60000); // 一分鐘一次
}

void updateDHT11( String T, String H )
{
// 使用AT指令上傳
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += IP;
cmd += "\",80";
sendDebug(cmd);
delay(2000);
if( Serial.find( "Error" ) )
{
debug.print( "RECEIVED: Error\nExit1" );
return;
}

cmd = GET + "&field1=" + T + "&field2=" + H +"\r\n";
Serial.print( "AT+CIPSEND=" );
Serial.println( cmd.length() );
if(Serial.find( ">" ) )
{
debug.print(">");
debug.print(cmd);
Serial.print(cmd);
}
else
{
sendDebug( "AT+CIPCLOSE" );
}
if( Serial.find("OK") )
{
debug.println( "RECEIVED: OK" );
}
else
{
debug.println( "RECEIVED: Error\nExit2" );
}
}

void sendDebug(String cmd)
{
// 傳到 USB TTL
debug.print("SEND: ");
debug.println(cmd);
Serial.println(cmd);
}

boolean connectWiFi()
{
// 連線到Wifi
Serial.println("AT+CWMODE=1");
delay(2000);
String cmd="AT+CWJAP=\"";
cmd+=SSID;
cmd+="\",\"";
cmd+=PASS;
cmd+="\"";
sendDebug(cmd);
delay(5000);
if(Serial.find("OK"))
{
debug.println("RECEIVED: OK");
return true;
}
else
{
debug.println("RECEIVED: Error");
return false;
}

cmd = "AT+CIPMUX=0";
sendDebug( cmd );
if( Serial.find( "Error") )
{
debug.print( "RECEIVED: Error" );
return false;
}
}
void InitDHT(){
// 初始化DHT
pinMode(dht_dpin,OUTPUT);
digitalWrite(dht_dpin,HIGH);
}

void ReadDHT(){
bGlobalErr=0;
byte dht_in;
byte i;
digitalWrite(dht_dpin,LOW);
delay(20);

digitalWrite(dht_dpin,HIGH);
delayMicroseconds(40);
pinMode(dht_dpin,INPUT);

dht_in=digitalRead(dht_dpin);

if(dht_in){
bGlobalErr=1;
return;
}
delayMicroseconds(80);
dht_in=digitalRead(dht_dpin);

if(!dht_in){
bGlobalErr=2;
return;
}
delayMicroseconds(80);
for (i=0; i<5; i++)
dht_dat[i] = read_dht_dat();
pinMode(dht_dpin,OUTPUT);
digitalWrite(dht_dpin,HIGH);
byte dht_check_sum =
dht_dat[0]+dht_dat[1]+dht_dat[2]+dht_dat[3];
if(dht_dat[4]!= dht_check_sum)
{bGlobalErr=3;}
};

byte read_dht_dat(){
byte i = 0;
byte result=0;
for(i=0; i< 8; i++){
while(digitalRead(dht_dpin)==LOW);
delayMicroseconds(30);
if (digitalRead(dht_dpin)==HIGH)
result |=(1<<(7-i));
while (digitalRead(dht_dpin)==HIGH);
}
return result;
}

[/c]