Where does the author of this sketch come up with "esp8266_command" ?
I can't find that in softwareserial.h (the only library used in the sketch), nor anywhere on the web)
Not at expressif.com, not here at this forum and not at github.....it's like some kind of magic phrase.
Here's the code.....
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial wifi_module(2,3); // Connect TX pin of esp to the pin 2 of Arduino and RX pin of esp to the pin 3 of Arduino
int red_led_pin = 9;
int green_led_pin = 8;
int buzzer_pin = 10;
int smoke_sensor_pin = A0;
void setup()
{
wifi_module.begin(115200); // start at 115200 baud because that is the default configuration of the ESP8266 AT firmware.
esp8266_command("AT+CIOBAUD=9600\r\n", 2000, DEBUG); // configure the ESP8266 to communicate at 9600 baud
wifi_module.begin(9600); // now that the ESP8266 has been configured to communicate at 9600 baud we need to switch to that baud rate
Serial.begin(115200);
// wifi_module.begin(9600); // Set the baudrate according to your esp8266
pinMode(red_led_pin, OUTPUT);
pinMode(green_led_pin, OUTPUT);
pinMode(buzzer_pin, OUTPUT);
pinMode(smoke_sensor_pin, INPUT);
esp8266_command("AT+RST\r\n",2000,DEBUG); // reset module
esp8266_command("AT+CWMODE=2\r\n",1000,DEBUG); // configure as access point
esp8266_command("AT+CIFSR\r\n",1000,DEBUG); // get ip address
esp8266_command("AT+CIPMUX=1\r\n",1000,DEBUG); // configure for multiple connections
[b]esp8266_command[/b]("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // turn on server on port 80
}
void loop()
{
int analogSensor = analogRead(smoke_sensor_pin);
if (analogSensor > 400)
{
digitalWrite(red_led_pin, HIGH);
digitalWrite(green_led_pin, LOW);
tone(buzzer_pin, 1000, 200);
}
else
{
digitalWrite(red_led_pin, LOW);
digitalWrite(green_led_pin, HIGH);
noTone(buzzer_pin);
}
if(wifi_module.available())
{
if(wifi_module.find("+IPD,"))
{
delay(1000);
int connectionId = wifi_module.read()-48;
String webpage = "<h1>IOT Smoke Detection System</h1>";
webpage +="<p>Smoke Value is ";
webpage += analogSensor;
webpage +="</p>";
if (analogSensor > 400)
{
webpage +="<h5>DANGER! Move Somewhere Else</h5>";
}
else
{
webpage +="<h4>Everything Normal</h4>";
}
String cipSend = "AT+CIPSEND=";
cipSend += connectionId;
cipSend += ",";
cipSend +=webpage.length();
cipSend +="\r\n";
esp8266_command(cipSend,1000,DEBUG);
esp8266_command(webpage,1000,DEBUG);
String closeCommand = "AT+CIPCLOSE=";
closeCommand+=connectionId; // append connection id
closeCommand+="\r\n";
esp8266_command(closeCommand,3000,DEBUG);
}
}
}
String esp8266_command(String command, const int timeout, boolean debug)
{
String response = "";
wifi_module.print(command);
long int time = millis();
while( (time+timeout) > millis())
{
while(wifi_module.available())
{
char c = wifi_module.read();
response+=c;
}
}
if(debug)
{
Serial.print(response);
}
return response;
}
