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Arduino - Gmail
In this guide, we will learn how to set up the Arduino to send an email using your Gmail account. The email will be sent from a Gmail account and can be received by any email account.
Hardware Required
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Pre-Preparation
To use the code, we need a Gmail account and a special password for the app. Here are the important details to remember:
- Please make a new Gmail account just for testing, not your usual one, to prevent problems.
- The password in the Arduino code is different from your Gmail login password. You must get an "App Password" from your Google Account by following specific steps.
Here are the steps one by one:
- Make a new Gmail account.
- Sign into the account you just made.
- Visit your Google Account.
- Go to the "Security" section.
- Turn on 2-Step Verification (You must activate 2-Step Verification to use app passwords).
- Go to the Google App Passwords website and make an app password. You can choose any name for it.
- Press the Create button. You will get a 16-digit password that appears like this:
- Keep and save this 16-digit number. You will use it in the Arduino code in the next step.
※ NOTE THAT:
Google's user interface might change. If you can't find "App Passwords" by following the steps above, search for "How to get Google App Passwords" to find updated instructions.
Arduino Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-gmail
*/
#include <WiFiS3.h>
#include <ESP_Mail_Client.h>
#define WIFI_SSID "YOUR_WIFI_SSID" // CHANGE IT
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD" // CHANGE IT
// the sender email credentials
#define SENDER_EMAIL "xxxxxx@gmail.com" // CHANGE IT
#define SENDER_PASSWORD "xxxx xxxx xxxx xxxx" // CHANGE IT to your Google App password
#define RECIPIENT_EMAIL "xxxxxx@gmail.com" // CHANGE IT
#define SMTP_HOST "smtp.gmail.com"
#define SMTP_PORT 587
SMTPSession smtp;
void setup() {
Serial.begin(9600);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.print("Connecting to Wi-Fi");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(300);
}
Serial.println();
Serial.print("Connected with IP: ");
Serial.println(WiFi.localIP());
Serial.println();
String subject = "Email Notification from Arduino";
String textMsg = "This is an email sent from Arduino.\n";
textMsg += "Sensor value: ";
textMsg += "15"; // OR replace this value read from a sensor
gmail_send(subject, textMsg);
}
void loop() {
// YOUR OTHER CODE HERE
}
void gmail_send(String subject, String textMsg) {
// set the network reconnection option
MailClient.networkReconnect(true);
smtp.debug(1);
smtp.callback(smtpCallback);
Session_Config config;
// set the session config
config.server.host_name = SMTP_HOST;
config.server.port = SMTP_PORT;
config.login.email = SENDER_EMAIL;
config.login.password = SENDER_PASSWORD;
config.login.user_domain = F("127.0.0.1");
config.time.ntp_server = F("pool.ntp.org,time.nist.gov");
config.time.gmt_offset = 3;
config.time.day_light_offset = 0;
// declare the message class
SMTP_Message message;
// set the message headers
message.sender.name = F("Arduino");
message.sender.email = SENDER_EMAIL;
message.subject = subject;
message.addRecipient(F("To Whom It May Concern"), RECIPIENT_EMAIL);
message.text.content = textMsg;
message.text.transfer_encoding = "base64";
message.text.charSet = F("utf-8");
message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_low;
// set the custom message header
message.addHeader(F("Message-ID: <abcde.fghij@gmail.com>"));
// connect to the server
if (!smtp.connect(&config)) {
Serial.println("Connection error: ");
Serial.print("- Status Code: ");
Serial.println(smtp.statusCode());
Serial.print("- Error Code: ");
Serial.println(smtp.errorCode());
Serial.print("- Reason: ");
Serial.println(smtp.errorReason().c_str());
return;
}
if (!smtp.isLoggedIn()) {
Serial.println("Not yet logged in.");
} else {
if (smtp.isAuthenticated())
Serial.println("Successfully logged in.");
else
Serial.println("Connected with no Auth.");
}
// start sending Email and close the session
if (!MailClient.sendMail(&smtp, &message)) {
Serial.println("Connection error: ");
Serial.print("- Status Code: ");
Serial.println(smtp.statusCode());
Serial.print("- Error Code: ");
Serial.println(smtp.errorCode());
Serial.print("- Reason: ");
Serial.println(smtp.errorReason().c_str());
}
}
// callback function to get the Email sending status
void smtpCallback(SMTP_Status status) {
// print the current status
Serial.println(status.info());
// print the sending result
if (status.success()) {
for (size_t i = 0; i < smtp.sendingResult.size(); i++) {
// get the result item
SMTP_Result result = smtp.sendingResult.getItem(i);
Serial.print("Status: ");
if (result.completed)
Serial.println("success");
else
Serial.println("failed");
Serial.print("Recipient: ");
Serial.println(result.recipients.c_str());
Serial.print("Subject: ");
Serial.println(result.subject.c_str());
}
Serial.println("----------------\n");
// free the memory
smtp.sendingResult.clear();
}
}
Quick Steps
- If this is the first time you use Arduino Uno R4, see how to setup environment for Arduino Uno R4 on Arduino IDE.
- Connect the Arduino board to your PC using a USB cable.
- Open the Arduino IDE on your PC.
- Select the right Arduino board (Arduino Uno R4 WiFi) and COM port.
- Open the Library Manager by clicking on the Library Manager icon on the left side of the Arduino IDE.
- Search for ESP Mail Client and find the ESP Mail Client by Mobizt.
- Click the Install button to install the ESP Mail Client library.
- Copy the code above and open it in the Arduino IDE.
- Update your WiFi details by replacing WIFI_SSID and WIFI_PASSWORD with your WiFi network's SSID and password.
- Edit your email details in the code by entering your email and password in SENDER_EMAIL and SENDER_PASSWORD.
- Change the email address for receiving messages to your email by updating RECIPIENT_EMAIL. Note: the recipient email may be the same as the sender's email.
※ NOTE THAT:
- The email of the sender must be a Gmail account.
- The password for the sender is the App password you received in the previous step.
- The recipient's email can be of any type.
- Click the Upload button in Arduino IDE to send code to Arduino.
- Open the Serial Monitor.
- Look at the result on Serial Monitor.
COM6
#### Message sent successfully
> C: message sent successfully
----------------
Message sent success: 1
Message sent failed: 0
----------------
Message No: 1
Status: success
Date/Time: May 27, 2024 04:42:50
Recipient: xxxxxx@gmail.com
Subject: Email Notification from Arduino
----------------
Autoscroll
Clear output
9600 baud
Newline
- Check the email inbox of the person you sent the email to. You will receive an email like the following:
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