Arduino - Send an email when panic switch was pressed

panic_email.ino

/*

Tihomir Nedev
April 2014
Change the values for the network setting. 
Change the emails. NB! Some sorvers won't accept email for unedentified devices as Arduino.

Hardware: Arduino board + Ethernet shield

*/

#include <SPI.h>
#include <Ethernet.h>


// Set the panic button pin
byte panicButton = 2;
boolean statusCheck=false; 
// this must be unique
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x59, 0x67 };  
// change network settings to yours
IPAddress ip( 192, 168, 100, 19 );    
IPAddress gateway( 192, 168, 100, 1 );
IPAddress subnet( 255, 255, 255, 0 );

// change server to your email server ip or domain
// IPAddress server( 1, 2, 3, 4 );
char server[] = "mail.example.com";

EthernetClient client;

void setup()
{
  Serial.begin(9600);
  pinMode(4,OUTPUT);
  digitalWrite(4,HIGH);
  Ethernet.begin(mac, ip, gateway, gateway, subnet); 
  delay(2000);
  Serial.println(F("Ready."));
  pinMode(panicButton, INPUT);
}

void loop()
{


  if(digitalRead(panicButton)==HIGH && statusCheck==false)
  {
      if(sendEmail()) Serial.println(F("Email sent"));
      else Serial.println(F("Email failed"));
		statusCheck = true;
  }
  else if (digitalRead(paniceButton)==LOW)
  {
	statusCheck = false; 
  }
}

byte sendEmail()
{
  byte thisByte = 0;
  byte respCode;

  if(client.connect(server,25)) {
    Serial.println(F("connected"));
  } else {
    Serial.println(F("connection failed"));
    return 0;
  }

  if(!eRcv()) return 0;

// change to your public ip
  client.println(F("helo 1.2.3.4"));

  if(!eRcv()) return 0;
  Serial.println(F("Sending From"));

// change to your email address (sender)
  client.println(F("MAIL From: <mail@example.com"));

  if(!eRcv()) return 0;

// change to recipient address
  Serial.println(F("Sending To"));
  client.println(F("RCPT To: <mail@example.com"));

  if(!eRcv()) return 0;

  Serial.println(F("Sending DATA"));
  client.println(F("DATA"));

  if(!eRcv()) return 0;

  Serial.println(F("Sending email"));

// change to recipient address
  client.println(F("To: You <mail@example.com>"));

// change to your address
  client.println(F("From: Me <mail@example.com>"));

  client.println(F("Subject: Panic Alarm!\r\n"));

  client.println(F("The panic button was pressed!!!"));

  client.println(F("."));

  if(!eRcv()) return 0;

  Serial.println(F("Sending QUIT"));
  client.println(F("QUIT"));

  if(!eRcv()) return 0;

  client.stop();

  Serial.println(F("disconnected"));

  return 1;
}

byte eRcv()
{
  byte respCode;
  byte thisByte;
  int loopCount = 0;

  while(!client.available()) {
    delay(1);
    loopCount++;

    // if nothing received for 10 seconds, timeout
    if(loopCount > 10000) {
      client.stop();
      Serial.println(F("\r\nTimeout"));
      return 0;
    }
  }

  respCode = client.peek();

  while(client.available())
  {  
    thisByte = client.read();    
    Serial.write(thisByte);
  }

  if(respCode >= '4')
  {
    efail();
    return 0;  
  }

  return 1;
}


void efail()
{
  byte thisByte = 0;
  int loopCount = 0;

  client.println(F("QUIT"));

  while(!client.available()) {
    delay(1);
    loopCount++;

    // if nothing received for 10 seconds, timeout
    if(loopCount > 10000) {
      client.stop();
      Serial.println(F("\r\nTimeout"));
      return;
    }
  }

  while(client.available())
  {  
    thisByte = client.read();    
    Serial.write(thisByte);
  }

  client.stop();

  Serial.println(F("disconnected"));
}

Don't you need to input your domain password somewhere? For example, if we're using Gmail, we would need to send the password to our Gmail account in order to access the SMTP server, correct?

Nope. The cool thing about telnetting into an e-mail server is that credentials are not needed for 'sending' e-mail, just for reading e-mail.

Line 53 has a typo "paniceButton"

Hi guys, has any one tried to use this code to send an email using his/her gmail or yahoo account, and it has worked.
Am new here and really need to use this code for my new Project. Thanks.

Hi guys, I cant connect to the internet. I put
// change server to your email server ip or domain
// IPAddress server( 1, 2, 3, 4 );
char server[] = "Smtp.gmail.com"; because im sending from an gmail.com account
but Im not sre what to put in
// change to your public ip
client.println(F("192, 168, 2, 1"));

please if somebody can help me thanks.

m8a2 Write the arduino ip

nice proyect

Hi all,

I tried the sketch with a gmail account, and got the following in the Serial Monitor:
Ready.
connected
220 smtp.gmail.com ESMTP t30sm8108718wra.52 - gsmtp
250 smtp.gmail.com at your service
Sending From
530 5.7.0 Must issue a STARTTLS command first. t30sm8108718wra.52 - gsmtp
221 2.0.0 closing connection t30sm8108718wra.52 - gsmtp
disconnected
Email failed

The t30... code is different every time. But the bottom line is that GMAIL apparently requires an additional command: STARTTLS.
Meaning: The smtp server is saying it won't accept plain text connections.

How would I activate this every time when a switch would off?

This is such an awesome and memory-cheap way of sending email - I'm working it into an ethernet relay controller sketch I found elsewhere, works every time.

I have it talking to a local unauthenticated, IP limited postfix server that collects mail for the network. No issues at all.