Arduino Nano ESP32 - Door Open Email Notification
This guide will show you how to set up an Arduino Nano ESP32 to send emails when a door opens. We'll discuss what components are necessary, how to set them up, and provide step-by-feira-step instructions on connecting an Arduino Nano ESP32 to a door sensor and an email service. This will help you receive immediate email notifications whenever the door is opened, enhancing your home security.
Hardware Preparation
| 1 | × | Arduino Nano ESP32 | |
| 1 | × | USB Cable Type-C | |
| 1 | × | Door Sensor | |
| 1 | × | (Optional) DC Power Jack | |
| 1 | × | Breadboard | |
| 1 | × | Jumper Wires | |
| 1 | × | (Recommended) Screw Terminal Adapter for Arduino Nano |
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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Overview of Door Sensor and Gmail
We provide detailed guides on Door Sensors and Gmail. Each guide gives thorough information and easy, step-by-step instructions for setting up the hardware, understanding how it works, and connecting and programming the Arduino Nano ESP32. Learn more about these guides by following these links.
- Arduino Nano ESP32 - Door Sensor tutorial
- Arduino Nano ESP32 - Gmail tutorial
Wiring Diagram between Door Sensor and Arduino Nano ESP32
This image is created using Fritzing. Click to enlarge image
Arduino Nano ESP32 Code
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-door-open-email-notification
*/
#include <WiFi.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
#define DOOR_SENSOR_PIN D2 // The Arduino Nano ESP32 pin D2 connected to door sensor's pin
int door_state; // current state of door sensor
int prev_door_state; // previous state of door sensor
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();
pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP); // set ESP32 pin to input pull-up mode
door_state = digitalRead(DOOR_SENSOR_PIN); // read state
}
void loop() {
prev_door_state = door_state; // save the last state
door_state = digitalRead(DOOR_SENSOR_PIN); // read new state
if (prev_door_state == LOW && door_state == HIGH) { // state change: LOW -> HIGH
Serial.println("The door is opened");
String subject = "Email Notification from ESP32";
String textMsg = "This is an email sent from ESP32.\n";
textMsg += "Your door is opened";
gmail_send(subject, textMsg);
} else if (prev_door_state == HIGH && door_state == LOW) { // state change: HIGH -> LOW
Serial.println("The door is closed");
}
}
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("ESP32");
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.printf("Connection error, Status Code: %d, Error Code: %d, Reason: %s\n", smtp.statusCode(), smtp.errorCode(), 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.printf("Error, Status Code: %d, Error Code: %d, Reason: %s\n", smtp.statusCode(), smtp.errorCode(), 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()) {
Serial.println("----------------");
Serial.printf("Email sent success: %d\n", status.completedCount());
Serial.printf("Email sent failed: %d\n", status.failedCount());
Serial.println("----------------\n");
for (size_t i = 0; i < smtp.sendingResult.size(); i++) {
// get the result item
SMTP_Result result = smtp.sendingResult.getItem(i);
Serial.printf("Message No: %d\n", i + 1);
Serial.printf("Status: %s\n", result.completed ? "success" : "failed");
Serial.printf("Date/Time: %s\n", MailClient.Time.getDateTimeString(result.timestamp, "%B %d, %Y %H:%M:%S").c_str());
Serial.printf("Recipient: %s\n", result.recipients.c_str());
Serial.printf("Subject: %s\n", result.subject.c_str());
}
Serial.println("----------------\n");
// free the memory
smtp.sendingResult.clear();
}
}
Detailed Instructions
To get started with Arduino Nano ESP32, follow these steps:
- If you are new to Arduino Nano ESP32, refer to the tutorial on how to set up the environment for Arduino Nano ESP32 in the Arduino IDE.
- Connect the Arduino Nano ESP32 board to the door sensor according to the provided diagram.
- Attach the door sensor to your door.
- Connect the Arduino Nano ESP32 board to your computer using a USB cable.
- Launch the Arduino IDE on your computer.
- Select the Arduino Nano ESP32 board and its corresponding COM port.
- In the Arduino IDE, click on the Library Manager icon on the left menu to open it.
- In the search box, enter ESP Mail Client and find ESP Mail Client by Mobizt.
- Click the Install button to add the ESP Mail Client library.
- Copy the given code and open it in the Arduino IDE.
- Enter your WiFi details in the code. Replace WIFI_SSID and WIFI_PASSWORD with your network name and password.
- Change the sender's email and password in the code. Change SENDER_EMAIL and SENDER_PASSWORD to your own email and password.
- Update RECIPIENT_EMAIL to the email address where you want to receive messages. This can be your own email if necessary.
※ NOTE THAT:
Ensure the sender's email comes from Gmail. Use the App password you got earlier as the sender's password. The recipient's email can be from any email provider.
- Click the Upload button in Arduino IDE to send the code to the Arduino Nano ESP32.
- Open the Serial Monitor.
- Open the door.
- Check the results on the Serial Monitor.
COM6
The door is opened
#### Email sent successfully
> C: Email 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 Nano ESP32
----------------
Autoscroll
Clear output
9600 baud
Newline
- Check the email inbox of the person you sent the email to. You will find an email that looks like this:
