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iot_gsm.ino
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iot_gsm.ino
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// GSM based IOT device program
// By - Deepak Sagar
// Including software serial library
#include <SoftwareSerial.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
// Configuring serial port
#define rx_pin 2
#define tx_pin 3
SoftwareSerial gsm(rx_pin,tx_pin);
// Configuring appliances interfacing pin
#define b1_relay 4 // BULB 1
#define b2_relay 5 // BULB 2
#define b3_relay 6 // BULB 3
#define f1_relay 7 // FAN 1
// Speed Controller
#define mode1 11 // Speed for 15 - 20 deg celsius (Min speed)
#define mode2 10 // Speed for 20 - 25 deg celsius
#define mode3 9 // Speed for 25 - 30 deg celsius
#define mode4 8 // Speed for > 30 deg celsius (Max Speed)
// Configuring temperature pin
#define outPin 12
#define DHTTYPE DHT11
DHT_Unified dht(outPin,DHTTYPE); // Creating DHT object(instance)
// Defining stair led pin
#define stairLed_pin 13
// Defining pir pin to take input from the pir sensor
#define pir_pin A2
int pirState = LOW;
int pirSensVal = 0;
int isPirActive = 0;
// Variable to store text message
String txt_msg;
String state = "";
String fanState = "OFF";
void setup(){
// Configuring the digital output pins
pinMode(b1_relay, OUTPUT);
pinMode(b2_relay, OUTPUT);
pinMode(b3_relay, OUTPUT);
pinMode(f1_relay, OUTPUT);
// Configuring different pin mode for speed controller
pinMode(mode1,OUTPUT);
pinMode(mode2,OUTPUT);
pinMode(mode3,OUTPUT);
pinMode(mode4,OUTPUT);
// Configuring Pir signal pin to detect motion
pinMode(pir_pin,INPUT);
pinMode(stairLed_pin,OUTPUT); // Configuring stair led pin
// setting intial state of all the appliances
digitalWrite(b1_relay, HIGH);
digitalWrite(b2_relay, HIGH);
digitalWrite(b3_relay, HIGH);
digitalWrite(f1_relay, HIGH);
// Setting initial state of all the speed controller relay
digitalWrite(mode1,HIGH);
digitalWrite(mode2,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,HIGH);
// Serial communication initialization
Serial.begin(9600);
Serial.println("Welcome !");
gsm.begin(9600);
// time to let connect gsm to a network
delay(5000);
Serial.println("GSM is ready...");
// Command to set gsm to text mode
gsm.print("AT+CMGF=1\r");
delay(100);
// Set module to send text data
gsm.print("AT+CNMI=2,2,0,0,0\r");
delay(100);
// Initiating Temperature Sensor (DHT11);
dht.begin();
sensor_t sensor;
dht.temperature().getSensor(&sensor);
delay(sensor.min_delay/1000);
}
void loop(){
if(gsm.available()>0){
txt_msg = gsm.readString();
Serial.println(txt_msg);
delay(10);
}
bulb_1(txt_msg);
delay(10);
bulb_2(txt_msg);
delay(10);
bulb_3(txt_msg);
delay(10);
fan_1(txt_msg);
delay(10);
all_appliance(txt_msg);
delay(10);
activatePir(txt_msg);
delay(10);
if(isPirActive) motionLed();
else digitalWrite(stairLed_pin,LOW);
delay(10);
speedControl();
delay(10);
// send_sms("GSM is Ready..."/);
}
// Logic for bulb 1
void bulb_1(String txt_msg){
if(txt_msg.indexOf("b1")>=0 && txt_msg.indexOf("on")>=0){
// Turning on bulb 1 and save current state
digitalWrite(b1_relay, LOW);
state = "Bulb 1 --> on";
Serial.println("Bulb 1 --> on");
txt_msg = "";
}
if(txt_msg.indexOf("b1")>=0 && txt_msg.indexOf("off")>=0){
// Turning on bulb 1 and save current state
digitalWrite(b1_relay, HIGH);
state = "Bulb 1 --> off";
Serial.println("Bulb 1 --> off");
txt_msg = "";
}
}
// Logic for bulb 2
void bulb_2(String txt_msg){
if(txt_msg.indexOf("b2")>=0 && txt_msg.indexOf("on")>=0){
// Turning on bulb 1 and save current state
digitalWrite(b2_relay, LOW);
state = "Bulb 2 --> on";
Serial.println("Bulb 2 --> on");
txt_msg = "";
}
if(txt_msg.indexOf("b2")>=0 && txt_msg.indexOf("off")>=0){
// Turning on bulb 2 and save current state
digitalWrite(b2_relay, HIGH);
state = "Bulb 2 --> off";
Serial.println("Bulb 2 --> off");
txt_msg = "";
}
}
// Logic for bulb 3
void bulb_3(String txt_msg){
if(txt_msg.indexOf("b3")>=0 && txt_msg.indexOf("on")>=0){
// Turning on bulb 1 and save current state
digitalWrite(b3_relay, LOW);
state = "Bulb 3 --> on";
Serial.println("Bulb 3 --> on");
txt_msg = "";
}
if(txt_msg.indexOf("b3")>=0 && txt_msg.indexOf("off")>=0){
// Turning on bulb 3 and save current state
digitalWrite(b3_relay, HIGH);
state = "Bulb 3 --> off";
Serial.println("Bulb 3 --> off");
txt_msg = "";
}
}
// Logic for fan 1
void fan_1(String txt_msg){
if(txt_msg.indexOf("f1")>=0 && txt_msg.indexOf("on")>=0){
// Turning on fan 1 and save current state
digitalWrite(f1_relay, LOW);
state = "Fan 1 --> on";
Serial.println("Fan 1 --> on");
txt_msg = "";
fanState = "ON";
}
if(txt_msg.indexOf("f1")>=0 && txt_msg.indexOf("off")>=0){
// Turning on fan 1 and save current state
digitalWrite(f1_relay, HIGH);
state = "Fan 1 --> off";
Serial.println("Fan 1 --> off");
txt_msg = "";
fanState = "OFF";
}
}
// Logic for all appliances
void all_appliance(String txt_msg){
if(txt_msg.indexOf("all")>=0 && txt_msg.indexOf("on")>=0){
// Turning on fan 1 and save current state
digitalWrite(f1_relay, LOW);
digitalWrite(b1_relay, LOW);
digitalWrite(b2_relay, LOW);
digitalWrite(b3_relay, LOW);
state = "ALL --> on";
Serial.println("ALL --> on");
txt_msg = "";
fanState = "ON";
}
if(txt_msg.indexOf("all")>=0 && txt_msg.indexOf("off")>=0){
// Turning on fan 1 and save current state
digitalWrite(f1_relay, HIGH);
digitalWrite(b1_relay, HIGH);
digitalWrite(b2_relay, HIGH);
digitalWrite(b3_relay, HIGH);
state = "ALL --> off";
Serial.println("ALL --> off");
txt_msg = "";
fanState = "OFF";
}
}
void modeSelect(float temp){
// Mode 1 min speed mode
if(temp <= 25) {
digitalWrite(mode2,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,HIGH);
digitalWrite(mode1,HIGH);
}
if(temp>25 && temp <=29){
digitalWrite(mode2,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,HIGH);
digitalWrite(mode1,LOW);
}
// Mode 2
if(temp>29 && temp <=33){
digitalWrite(mode1,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,HIGH);
digitalWrite(mode2,LOW);
}
// Mode 3
if(temp > 33 && temp <= 37){
digitalWrite(mode1,HIGH);
digitalWrite(mode2,HIGH);
digitalWrite(mode4,HIGH);
digitalWrite(mode3,LOW);
}
// Mode 4 max speed mode
if(temp > 37){
digitalWrite(mode1,HIGH);
digitalWrite(mode2,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,LOW);
}
}
void speedControl(){
if(fanState == "ON"){
sensors_event_t event;
dht.temperature().getEvent(&event);
if(isnan(event.temperature)){
Serial.println(F("Error reading temperature"));
}
else {
modeSelect(event.temperature);
Serial.print("Temperature = ");
Serial.println(event.temperature);
}
}
if(fanState == "OFF"){
digitalWrite(mode1,HIGH);
digitalWrite(mode2,HIGH);
digitalWrite(mode3,HIGH);
digitalWrite(mode4,HIGH);
}
}
// Motion Led Control PIR Sensor
void motionLed(){
pirSensVal = digitalRead(pir_pin);
if (pirSensVal == HIGH) {
digitalWrite(stairLed_pin, HIGH);
delay(100); // Delay of led is 1 sec
if (pirState == LOW) {
Serial.println(" Motion detected ");
pirState = HIGH;
}
}
else {
digitalWrite(stairLed_pin, LOW);
delay(100);
if (pirState == HIGH){
Serial.println("The action/ motion has stopped");
pirState = LOW;
}
}
}
// Activate PIR sensor to detect motion
void activatePir(String msg){
if(txt_msg.indexOf("pir=on")>=0){
isPirActive = 1;
state = "PIR --> active";
Serial.println("PIR --> active");
txt_msg = "";
}
if(txt_msg.indexOf("pir=off")>=0){
isPirActive = 0;
state = "PIR --> deactive";
Serial.println("PIR --> deactive");
txt_msg = "";
}
}
// Function to send SMS
void send_sms(String msg){
// setting gsm for text mode
gsm.print("AT+CMGF=1\r");
delay(100);
// initializing mobile number of reciever(TO)
gsm.println("AT+CMGS = \"+919504393742\""); // Replace mobile number with yours
delay(100);
// Sending message
gsm.println(msg);
delay(100);
// Message end command (ctrl+z == 26 ASCII value)
gsm.println((char)26);
delay(100);
gsm.println();
delay(5000); // Time delay to send message
}