ESP8266 - Water Leak Email Notification
This guide will teach you how to use an ESP8266 to detect water leaks and send email alerts immediately. We'll cover setting up the sensor, provide code examples, and describe how to link with email services. This can protect your home or office from water damage. It's ideal for those who like DIY projects and want to enhance their water leak detection systems.
Hardware Preparation
| 1 | × | ESP8266 NodeMCU | |
| 1 | × | Micro USB Cable | |
| 1 | × | Water Leak Detector | |
| 1 | × | Breadboard | |
| 1 | × | Jumper Wires | |
| 1 | × | (Optional) DC Power Jack | |
| 1 | × | (Optional) Screw Terminal Expansion Board for ESP8266 |
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables.
Additionally, some of these links are for products from our own brand, DIYables.
Overview of Water Sensor and Gmail
We provide detailed guides on using Water Sensors and Gmail. Each guide includes full instructions and simple steps for setting up the hardware, understanding how it works, and connecting and programming the ESP8266. For more information, please visit these links.
- ESP8266 - Water Leak Detector tutorial
- ESP8266 - Gmail tutorial
Wiring Diagram between Water Sensor and ESP8266
This image is created using Fritzing. Click to enlarge image
See more in ESP8266's pinout and how to supply power to the ESP8266 and other components.
ESP8266 Code
/*
* This ESP8266 NodeMCU code was developed by newbiely.com
*
* This ESP8266 NodeMCU code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/esp8266/esp8266-water-leak-email-notification
*/
#include <ESP8266WiFi.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 WATER_SENSOR_PIN D7 // ESP8266 pin D7 connected to water sensor's pin
int water_state; // current state of water sensor
int prev_water_state; // previous state of water 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(WATER_SENSOR_PIN, INPUT_PULLUP); // set ESP8266 pin to input pull-up mode
water_state = digitalRead(WATER_SENSOR_PIN); // read state
}
void loop() {
prev_water_state = water_state; // save the last state
water_state = digitalRead(WATER_SENSOR_PIN); // read new state
if (prev_water_state == HIGH && water_state == LOW) {
Serial.println("Water leakage is detected!");
String subject = "Email Notification from ESP8266";
String textMsg = "This is an email sent from ESP8266.\n";
textMsg += "Water leakage is detected";
gmail_send(subject, textMsg);
}
}
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("ESP8266");
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 ESP8266 on Arduino IDE, follow these steps:
- Check out the how to setup environment for ESP8266 on Arduino IDE tutorial if this is your first time using ESP8266.
- Wire the components as shown in the diagram.
- Place the water sensor in a location where it can detect leaks.
- Connect the ESP8266 board to your computer using a USB cable.
- Open Arduino IDE on your computer.
- Choose the correct ESP8266 board, such as (e.g. NodeMCU 1.0 (ESP-12E Module)), and its respective COM port.
- Open the Library Manager by click on the Library Manager icon in the left navigation bar of the Arduino IDE.
- Search for ESP Mail Client and find the library by Mobizt.
- Click Install button to add the ESP Mail Client library.
- Copy the provided code and open it with Arduino IDE.
- Enter your WiFi information including network name (SSID) and password by changing WIFI_SSNID and WIFI_PASSWORD.
- Change the email sender's details to yours by editing SENDER_EMAIL and SENDER_PASSWORD.
- Put the email address of the receiver in the code by updating RECIPIENT_EMAIL. This can be the same email as the sender’s.
※ NOTE THAT:
- The sender must use a Gmail account.
- The password for the sender should be the App password you got before.
- Any type of email can be used for the recipient's email.
- Press the Upload button in Arduino IDE to send the code to ESP8266.
- Open the Serial Monitor.
- Pour water on the water sensor.
- Check the result on the Serial Monitor.
COM6
Water leakage is detected
#### 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 ESP8266
----------------
Autoscroll
Clear output
9600 baud
Newline
- Check your email. You will get an email similar to this:
