GSM Pump Motor Controller Circuit using Arduino: In this post we are going to construct a farmer friendly GSM pump motor controller circuit which could turn on and off the irrigation system remotely from anywhere in the world via cellphone SMS and return you with an acknowledgement message.
The Design:
Agriculture is one of biggest industry in India which serves food for more than a billion people every year. Producing vast amount of food is never an easy task; irrigation is one of the factor. Most of the agriculturist’s crop field is situated far from their residence, just turning on the water pump costs huge for their transportation per year.
This SMS based GSM pump motor controller takes a baby step towards agricultural development, this may not be a revolutionary project but, it may bring delight among agriculturists.
Circuit Diagram:
The project is designed with minimal hardware components so that a beginner can accomplish it with ease.
The circuit consists of power supply, which powers the whole setup.
The Arduino is the brain of the project which take decisions and GSM modem which sends and receives text SMS and communicate with the user and relay which controls the motor.
A fixed 12V voltage regulator gives power to arduino, GSM modem and relay. The GSM modem is connected to arduino at pin #0 and pin #1, which are RX and TX respectively.
The RX of GSM is connected to TX of arduino and TX of GSM is connected to RX of arduino. If you are confused, just look at the below diagram,misconnection will not send or receive SMS.
ARDUINO TX———————-RX GSM modem
RX———————-TX
Ground to ground connection is also established between arduino and GSM modem.
Try to get a male jack power connector for the GSM and arduino, if not just solder the wires directly from power supply to arduino and GSM, which might increase the mess in the project.
The transistor drives the relay and the diode protects the circuit from high voltage spikes while switching the relay ON/OFF.
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#include <EEPROM.h>
SoftwareSerial gsm(10, 11); // RX, TX
LiquidCrystal_I2C lcd(0x27, 16, 2);
SoftwareSerial gsm(10, 11); // RX, TX
LiquidCrystal_I2C lcd(0x27, 16, 2);
int address = 0;
int wr_call_add = 1;
int f_address = 2;
int eeprom_dead = 3;
int wr_call_val = 0;
int f_value = 70;
int value = 0;
int ring = 0;
int i = 0;
int var = 0;
int eeprom_tst = 0;
int eeprom_tst_ack = 0;
int tst_var = 100;
int wr_call_tst = 100;
int eeprom_dead_val = 0;
String number = “”;
String string = “”;
const int output = 5;
const int red = 7;
const int buzzer = 4;
const int green = 6;
boolean wait = true;
boolean at_flag = 1;
boolean net_flag = 1;
void setup()
{
Serial.begin(9600);
lcd.init();
lcd.backlight();
gsm.begin(9600);
pinMode(output, OUTPUT);
pinMode(red, OUTPUT);
pinMode(buzzer, OUTPUT);
pinMode(green, OUTPUT);
if (EEPROM.read(f_address) != f_value)
{
EEPROM.write(f_address, f_value);
EEPROM.write(address, value);
EEPROM.write(wr_call_add, wr_call_val);
eeprom_dead_val = 0;
EEPROM.write(eeprom_dead, eeprom_dead_val);
}
if (EEPROM.read(eeprom_dead) == 1)
{
while (true)
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“EEPROM Error.”);
lcd.setCursor(0, 1);
lcd.print(“System Disabled.”);
delay(1500);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Reload the code”);
lcd.setCursor(0, 1);
lcd.print(“with new address”);
delay(1500);
}
}
if (EEPROM.read(address) == 0)
{
digitalWrite(output, LOW);
digitalWrite(red, HIGH);
digitalWrite(buzzer, LOW);
delay(2000);
digitalWrite(green, LOW);
gsm_init();
lcd.clear();
if (EEPROM.read(wr_call_add) == 0)
{
lcd.setCursor(0, 0);
lcd.print(“Sending SMS”);
lcd.setCursor(0, 1);
lcd.print(“Acknowledgement.”);
delay(1000);
gsm.println(“AT+CMGF=1”);
delay(500);
gsm.print(“AT+CMGS=”);
gsm.print(“\””);
gsm.print(str);
gsm.println(“\””);
delay(1000);
gsm.println(“Motor is OFF / System is Ready.”);
delay(100);
gsm.println((char)26);
}
if (EEPROM.read(wr_call_add) == 1)
{
wr_call_val = 0;
EEPROM.write(wr_call_add, wr_call_val);
}
}
if (EEPROM.read(address) == 1)
{
eeprom_test();
output_begin();
}
}
void(* resetFunc) (void) = 0;
void loop()
{
serialEvent();
if (ring == 1)
{
number = “+918830584864”;
var = string.indexOf(“+CLIP: \””);
if (var > 0)
{
number += string.substring(var + 8, var + 13 + 7);
}
if (number[0] == str[0] && number[1] == str[1] && number[2] == str[2] && number[3] == str[3]
&& number[4] == str[4] && number[5] == str[5] && number[6] == str[6] && number[7] == str[7]
&& number[8] == str[8] && number[9] == str[9] && number[10] == str[10] && number[11] == str[11])
{
gsm.println(“ATH”);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Incomming call”);
lcd.setCursor(0, 1);
lcd.print(“Number Verified.”);
delay(2000);
if (EEPROM.read(address) == 0)
{
EEPROM.write(address, 1);
}
else if (EEPROM.read(address) == 1)
{
EEPROM.write(address, 0);
}
resetFunc();
}
if (!(number[0] == str[0] && number[1] == str[1] && number[2] == str[2] && number[3] == str[3]
&& number[4] == str[4] && number[5] == str[5] && number[6] == str[6] && number[7] == str[7]
&& number[8] == str[8] && number[9] == str[9] && number[10] == str[10] && number[11] == str[11]))
{
gsm.println(“ATH”);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Unknown number”);
lcd.setCursor(0, 1);
lcd.print(“Call Rejected.”);
wr_call_val = 1;
EEPROM.write(wr_call_add, wr_call_val);
delay(2000);
resetFunc();
}
}
if (EEPROM.read(address) == 0)
{
serialEvent();
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“System Standby”);
lcd.setCursor(0, 1);
lcd.print(“Status: OFF”);
delay(1000);
}
else if (EEPROM.read(address) == 1)
{
lcd.setCursor(0, 0);
lcd.print(“STATUS: ON”);
lcd.setCursor(0, 1);
lcd.print(“—————-“);
}
}
void gsm_init()
{
lcd.print(“System booting….”);
lcd.setCursor(0, 1);
lcd.print(“initiating……”);
delay(1500);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Checking Module”);
lcd.setCursor(0, 1);
lcd.print(“Connectivity….”);
while (at_flag)
{
gsm.println(“AT”);
while (gsm.available() > 0)
{
if (gsm.find(“OK”))
at_flag = 0;
}
delay(1000);
}
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Module”);
lcd.setCursor(0, 1);
lcd.print(“Connection: OK”);
delay(1500);
eeprom_test();
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“System is Ready”);
lcd.setCursor(0, 1);
lcd.print(“—————-“);
delay(1500);
}
void serialEvent()
{
while (gsm.available())
{
char read_char = gsm.read();
string += read_char;
i++;
if (string[i – 4] == ‘R’ && string[i – 3] == ‘I’ && string[i – 2] == ‘N’ && string[i – 1] == ‘G’ )
{
ring = 1;
}
}
}
void output_begin()
{
digitalWrite(red, LOW);
digitalWrite(buzzer, HIGH);
delay(2000);
digitalWrite(buzzer, LOW);
digitalWrite(green, HIGH);
if (EEPROM.read(wr_call_add) == 0)
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Sending SMS”);
lcd.setCursor(0, 1);
lcd.print(“Acknowledgement.”);
delay(1000);
gsm.println(“AT+CMGF=1”);
delay(500);
gsm.print(“AT+CMGS=”);
gsm.print(“\””);
gsm.print(str);
gsm.println(“\””);
delay(1000);
gsm.println(“Motor is ON.”);
delay(100);
gsm.println((char)26);
}
if (EEPROM.read(wr_call_add) == 1)
{
wr_call_val = 0;
EEPROM.write(wr_call_add, wr_call_val);
}
lcd.clear();
}
void eeprom_test()
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Testing EEPROM”);
lcd.setCursor(0, 1);
lcd.print(“Memory.”);
delay(1500);
eeprom_tst = EEPROM.read(address);
eeprom_tst_ack = EEPROM.read(wr_call_add);
EEPROM.write(address, tst_var);
EEPROM.write(wr_call_add, wr_call_tst);
if (EEPROM.read(address) == tst_var && EEPROM.read(wr_call_add) == wr_call_tst)
{
EEPROM.write(address, eeprom_tst);
EEPROM.write(wr_call_add, eeprom_tst_ack);
if (EEPROM.read(address) != eeprom_tst || EEPROM.read(wr_call_add) != eeprom_tst_ack)
{
digitalWrite(output, LOW);
digitalWrite(red, HIGH);
digitalWrite(buzzer, LOW);
delay(2000);
digitalWrite(green, LOW);
eeprom_dead_val = 1;
EEPROM.write(eeprom_dead, eeprom_dead_val);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“EEPROM Test is”);
lcd.setCursor(0, 1);
lcd.print(“Unsuccessful.”);
delay(1500);
eeprom_sms();
}
else if (EEPROM.read(address) == eeprom_tst && EEPROM.read(wr_call_add) == eeprom_tst_ack)
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“EEPROM Test is”);
lcd.setCursor(0, 1);
lcd.print(“Successful.”);
delay(1500);
}
}
else if (EEPROM.read(address) != tst_var || EEPROM.read(wr_call_add) != wr_call_tst)
{
digitalWrite(output, LOW);
digitalWrite(red, HIGH);
digitalWrite(buzzer, LOW);
delay(2000);
digitalWrite(green, LOW);
eeprom_dead_val = 1;
EEPROM.write(eeprom_dead, eeprom_dead_val);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“EEPROM Test is”);
lcd.setCursor(0, 1);
lcd.print(“Unsuccessful.”);
delay(1500);
eeprom_sms();
}
}
void eeprom_sms()
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Sending SMS”);
lcd.setCursor(0, 1);
lcd.print(“Acknowledgement”);
delay(1000);
gsm.println(“AT+CMGF=1”);
delay(500);
gsm.print(“AT+CMGS=”);
gsm.print(“\””);
gsm.print(str);
gsm.println(“\””);
delay(1000);
gsm.println(“EEPROM error. System disabled. Please reload the code with new address.”);
delay(100);
gsm.println((char)26);
while (true)
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“EEPROM Error.”);
lcd.setCursor(0, 1);
lcd.print(“System Disabled.”);
delay(1500);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(“Reload the code”);
lcd.setCursor(0, 1);
lcd.print(“with new address”);
delay(1500);
}
}