I have shown you - How to use Sim900A GSM module with Arduino and make an SMS controlled Automation system.
Here, for an example, I have shown LEDs that can be turned on/off via SMS using Sim900 GSM module.
Arduino with GSM module
GSM module Sim900a
GSM based Home Automation
Wifi_HomeAutomation.ino - file coding
//Visit www.roboshala.com for more details on NodeMCU and other projects. #include <ESP8266WiFi.h> const char* ssid = "CPH1613"; // SSID i.e. Service Set Identifier is the name of your WIFI const char* password = "12345678"; // Your Wifi password, in case you have open network comment the whole statement. int R1=D1; // GPIO13 or for NodeMCU you can directly write D7 int R2=D2; int R3=D3; int R4=D4; WiFiServer server(80); // Creates a server that listens for incoming connections on the specified port, here in this case port is 80. void setup() { Serial.begin(115200); delay(10); pinMode(R1, OUTPUT); pinMode(R2, OUTPUT); pinMode(R3, OUTPUT); pinMode(R4, OUTPUT); digitalWrite(R1,HIGH); digitalWrite(R2,HIGH); digitalWrite(R3,HIGH); digitalWrite(R4,HIGH); // Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.print("Use this URL to connect: "); Serial.print("http://"); Serial.print(WiFi.localIP()); //Gets the WiFi shield's IP address and Print the IP address of serial monitor Serial.println("/"); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data Serial.println("new client"); while(!client.available()){ delay(1); } // Read the first line of the request String request = client.readStringUntil('\r'); Serial.println(request); client.flush(); // Match the request if (request.indexOf("/Relay1On") != -1) { digitalWrite(R1,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 1 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay1Off") != -1) { digitalWrite(R1, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 1 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay2On") != -1) { digitalWrite(R2,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 2 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay2Off") != -1) { digitalWrite(R2, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 2 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay3On") != -1) { digitalWrite(R3,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 3 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay3Off") != -1) { digitalWrite(R3, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 3 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay4On") != -1) { digitalWrite(R4,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 4 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay4Off") != -1) { digitalWrite(R4, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 4 is OFF"); client.println("</html>"); client.stop(); delay(1); } }
GoogleAssitance_Automation_.ino - file coding
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#define Relay1 D6
#define Relay2 D5
#define Relay3 D2
#define Relay4 D1
#define WLAN_SSID "Roboshala" // Your SSID
#define WLAN_PASS "roboindia@alok" // Your password
/************************* Adafruit.io Setup *********************************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883 // use 8883 for SSL
#define AIO_USERNAME "Roboshala" // Replace it with your username
#define AIO_KEY "50a98bb44f6b48b69e645badadf8fb577894" // Replace with your Project Auth Key
/************ Global State (you don't need to change this!) ******************/
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiFlientSecure for SSL
//WiFiClientSecure client;
// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
/****************************** Feeds ***************************************/
// Setup a feed called 'onoff' for subscribing to changes.
Adafruit_MQTT_Subscribe Light1 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME"/feeds/Relay1"); // FeedName
Adafruit_MQTT_Subscribe Light2 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/Relay2");
Adafruit_MQTT_Subscribe Light3 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/Relay3");
Adafruit_MQTT_Subscribe Light4 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/Relay4");
void MQTT_connect();
void setup() {
Serial.begin(115200);
pinMode(Relay1, OUTPUT);
pinMode(Relay2, OUTPUT);
pinMode(Relay3, OUTPUT);
pinMode(Relay4, OUTPUT);
// Connect to WiFi access point.
Serial.println(); Serial.println();
Serial.print("Connecting to ");
Serial.println(WLAN_SSID);
WiFi.begin(WLAN_SSID, WLAN_PASS);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
// Setup MQTT subscription for onoff feed.
mqtt.subscribe(&Light1);
mqtt.subscribe(&Light3);
mqtt.subscribe(&Light2);
mqtt.subscribe(&Light4);
}
void loop() {
MQTT_connect();
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(20000))) {
if (subscription == &Light1) {
Serial.print(F("Got: "));
Serial.println((char *)Light1.lastread);
int Light1_State = atoi((char *)Light1.lastread);
digitalWrite(Relay1, Light1_State);
}
if (subscription == &Light2) {
Serial.print(F("Got: "));
Serial.println((char *)Light2.lastread);
int Light2_State = atoi((char *)Light2.lastread);
digitalWrite(Relay2, Light2_State);
}
if (subscription == &Light3) {
Serial.print(F("Got: "));
Serial.println((char *)Light3.lastread);
int Light3_State = atoi((char *)Light3.lastread);
digitalWrite(Relay3, Light3_State);
}
if (subscription == &Light4) {
Serial.print(F("Got: "));
Serial.println((char *)Light4.lastread);
int Light4_State = atoi((char *)Light4.lastread);
digitalWrite(Relay4, Light4_State);
}
}
}
void MQTT_connect() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 5 seconds...");
mqtt.disconnect();
delay(5000); // wait 5 seconds
retries--;
if (retries == 0) {
// basically die and wait for WDT to reset me
while (1);
}
}
Serial.println("MQTT Connected!");
}
Wifi_HomeAutomation.ino - file coding
//Visit www.roboshala.com for more details on NodeMCU and other projects. #include <ESP8266WiFi.h> const char* ssid = "CPH1613"; // SSID i.e. Service Set Identifier is the name of your WIFI const char* password = "12345678"; // Your Wifi password, in case you have open network comment the whole statement. int R1=D1; // GPIO13 or for NodeMCU you can directly write D7 int R2=D2; int R3=D3; int R4=D4; WiFiServer server(80); // Creates a server that listens for incoming connections on the specified port, here in this case port is 80. void setup() { Serial.begin(115200); delay(10); pinMode(R1, OUTPUT); pinMode(R2, OUTPUT); pinMode(R3, OUTPUT); pinMode(R4, OUTPUT); digitalWrite(R1,HIGH); digitalWrite(R2,HIGH); digitalWrite(R3,HIGH); digitalWrite(R4,HIGH); // Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.print("Use this URL to connect: "); Serial.print("http://"); Serial.print(WiFi.localIP()); //Gets the WiFi shield's IP address and Print the IP address of serial monitor Serial.println("/"); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data Serial.println("new client"); while(!client.available()){ delay(1); } // Read the first line of the request String request = client.readStringUntil('\r'); Serial.println(request); client.flush(); // Match the request if (request.indexOf("/Relay1On") != -1) { digitalWrite(R1,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 1 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay1Off") != -1) { digitalWrite(R1, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 1 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay2On") != -1) { digitalWrite(R2,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 2 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay2Off") != -1) { digitalWrite(R2, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 2 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay3On") != -1) { digitalWrite(R3,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 3 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay3Off") != -1) { digitalWrite(R3, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 3 is OFF"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay4On") != -1) { digitalWrite(R4,LOW); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 4 is ON"); client.println("</html>"); client.stop(); delay(1); } if (request.indexOf("/Relay4Off") != -1) { digitalWrite(R4, HIGH); client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("Relay 4 is OFF"); client.println("</html>"); client.stop(); delay(1); } }
GoogleAssitance_Automation_.ino - file coding