A Wireless Application of The Rain, Humidity and Temperature Sensors Based on Arduino and Bluetooth

Intelligent Control Laboratory, Dept. of Engineering Science, National Cheng Kung University
Advisor : Prof. Teh-Lu Liao
Student : Zheng-De Liu

Intelligent Control Laboratory, Dept. of Engineering Science,
National Cheng Kung University
 Motivation
 Block Diagram
 Framework Diagram
 Arduino Introduction
 Device Description
 Flow Diagram
 Master Code & Slave Code
 Performance
2

3
Schematic View
Rain Sensor
Humidity and
Temperature Sensor
Control
Control
LCM
Screen
Bluetooth

4

5
Microprocessor
Rain Sensor
Temprature and
Humidity Sensor
Wireless
Transceiver
Uart
Host
Debug
Uart
I/O
I/O
Microprocessor
Light and
Buzzer
LCM
Screen
Wireless
Transceiver
Uart
Uart
Host
Debug
I/O
IIC
Central Node Sensor Node

6
Arduino-
ATMEGA2560
YL-83
DHT-11
HC-05
Uart
Serial
Monitor
Uart
I/O
I/O
Arduino-
ATMEGA2560
Light and
Buzzer
LCM
1602
HC-05
Uart
Uart
Serial
Monitor
I/O
IIC
Central Node Sensor Node

 Arduino is an open-source
electronics prototyping
platformbased on flexible,
easy-to-use hardware and
software.
7

8
Rain Sensor : YL-83
Sensitivity: 0~5V
Humidity and Temperature
Sensor : DHT11
Sensitivity:0~50 oC
20~90%RH
Bluetooth : HC-05
LCM : 1602
8-Channels Relay DIY Extension Cord

9
Arduino-1
LCM
Extension
cord
Relay
Bizzer
Bluetooth
Light

10
Rain
Sensor
Humidity and Tempture
Sensor
Bluetoooth
Arduino-2

11
HC-05
Slave
Slave
Slave
Master

 The Bluetooth module has two work modes:
Commands response mode and auto connection mode.
Ex: AT+ROLE=1 (Enter) Can change from M to S .
AT+BIND=12,3,287044 (Enter) Binding address.
12

13
Start
BT
match?
Finding
Slave?
Raining?
Set AT-command
LCM show
DHT11-Sensor
Reading DHT11
Form BT
LCM show
YL-83-Sensor
Reading YL-83
Form BT
Switch
on?
Buzzer call
& Light on
Y
N
N
Y
N
Y
N
Y
LCM show
standby
LCM show
standby
LCM show
standby
Rain
stopped?
End
Y
N

14

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#define Bizzer 44
#define Switch4 A0
#define Relay_Ch1 45
#define Master_Tx 13
#define Master_Rx 12
#define I2C_ADDR 0x20
#define BACKLIGHT_PIN 7
#define En_pin 4
#define Rw_pin 5
#define Rs_pin 6
#define D4_pin 0
#define D5_pin 1
#define D6_pin 2
#define D7_pin 3
#define BACKLIGHT_FLAG NEGATIVE
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_p
in,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
SoftwareSerial BT(Master_Rx, Master_Tx);
15
char i,j;
int s;
void LCD_init()
{
lcd.begin (20,4);
lcd.setBacklightPin(BACKLIGHT_
PIN,BACKLIGHT_FLAG);
lcd.setBacklight(1);
lcd.clear();
delay(100);
}
void setup()
{
pinMode(Bizzer,OUTPUT);
pinMode(Switch4,INPUT);
pinMode(Relay_Ch1,OUTPUT);
LCD_init();
BT.begin(9600);
Serial.begin(9600);
lcd.setCursor(0,0);
lcd.print("Standby!!");
}
void loop()
{
char str[5];
delay(900);
for(i=0;i<5;i++)
{
if(BT.available()>0)
{
str[i]= BT.read();
Serial.println(str[i]);
delay(100);
}
}
s=analogRead(Switch4);
Serial.println(s);
if(s>600)
{
digitalWrite(Bizzer,LOW);
digitalWrite(Relay_Ch1,LOW);
LCD_init();
lcd.setCursor(0,0);
str[0]=str[1]=str[2]=str[3]=str[4]='X';
delay(7500);
}
if(str[0]=='d'||str[0]=='h'||str[0]=='t')
{
digitalWrite(Bizzer,HIGH);
digitalWrite(Relay_Ch1,HIGH);
if(str[0]=='d')
{
lcd.setCursor(7,2);
lcd.print("level-1");
}
if(str[0]=='h')
{
lcd.setCursor(7,2);
}
if(str[0]=='t')
{
lcd.setCursor(7,2);
}
lcd.setCursor(0,0);
lcd.print("warning!!");
lcd.setCursor(0,1);
lcd.print("YL-83 DHT11 Sensor");
lcd.setCursor(0,2);
lcd.print("state: ");
}
if(str[0]=='n')
{
digitalWrite(Bizzer,LOW);
digitalWrite(Relay_Ch1,LO
W);
LCD_init();
lcd.setCursor(0,0);
}
lcd.setCursor(0,3);
lcd.print("H:");
lcd.setCursor(4,3);
lcd.print("(%) ; T:");
lcd.setCursor(14,3);
lcd.print("(oC)");
lcd.setCursor(2,3);
lcd.print(str[1]);
lcd.setCursor(3,3);
lcd.print(str[2]);
lcd.print(str[3]);
lcd.print(str[4]);
}

#include <SoftwareSerial.h>
#include <dht11.h>
#define Slave_TxPin 11
#define Slave_RxPin 10
#define Temp_sensor 22
int rain_AO=A0;
SoftwareSerial BT(Slave_RxPin, Slave_TxPin);
dht11 DHT11;
void BT_init()
{
int i;
BT.write("ATrn");
delay(200);
BT.write("AT+ROLE=1rn");
delay(200);
BT.write("AT+INITrn");
delay(200);
BT.write("AT+BIND=12,3,287044rn");
delay(200);
BT.write("AT+CMODE=0rn");
delay(200);
}
16
void setup()
{
Serial.begin(9600);
BT.begin(9600);
pinMode(rain_AO,INPUT);
// BT_init();
}
void loop()
{
char Humidity_tens;
char Humidity_units;
char Temperature_tens;
char Temperature_units;
int chk = DHT11.read(Temp_sensor);
int a = DHT11.humidity;
int b = DHT11.temperature;
char table[]="0123456789";
int i,k;
i=analogRead(rain_AO);
if(i<1000)
{
if(i>500 && i<1000)
{
BT.print('d');
Serial.println('d');
}
if(i>300 && i<500)
{
BT.print('h');
Serial.println('h');;
}
if(i>50 && i<300)
{
BT.print('t');
Serial.println('t');;
}
delay(100);
}
else if(i>=1000)
{
BT.print('n');
Serial.println('n');
delay(100);
}
Humidity_tens = table[a/10];
Humidity_units = table[a%10];
Serial.println(Humidity_tens);
Serial.println(Humidity_units);
Temperature_tens = table[b/10];
Temperature_units = table[b%10];
Serial.println(Temperature_tens);
Serial.println(Temperature_units);
BT.print(Humidity_tens);
delay(100);
BT.print(Humidity_units);
delay(100);
BT.print(Temperature_tens);
delay(100);
BT.print(Temperature_units);
delay(100);
delay(1000);
}

17

Thank you for your attention.
18

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