Published December 30, 2020 © LGPL

Send multiple sensors data to Firebase using ESP8266

Send multiple sensors data to Firebase realtime database using ESP8266 and Arduino.

IntermediateFull instructions provided32,807

Send multiple sensors data to Firebase using ESP8266

Things used in this project

Hardware components

Arduino UNO

Espressif ESP8266 ESP-01

Ultrasonic Sensor - HC-SR04 (Generic)

Proximity Sensor

Jumper wires (generic)

Breadboard (generic)

USB-A to B Cable

Software apps and online services

Arduino IDE

Google Firebase

Story

Overview

In this tutorial, you will learn how to send multiple sensor data to Firebase real-time database using ESP8266 (ESP-01) module and Arduino UNO.

What You Will Learn

How to send sensor data to ESP8266 using serial communication.
How to store sensor data in Firebase real-time database.

For demonstration purposes, I use two IR sensors and one ultrasonic sensor but you can use whatever you want sensors.

This is one method to send sensor data to Firebase real-time database using ESP8266. (There are more methods to send sensor data to Firebase real-time database using ESP8266.)

Step 1: Go to this link and connect ESP8266 to Firebase real-time database.

All necessary steps include this link.

https://www.hackster.io/pulasthi-Narada/connecting-esp8266-to-firebase-to-send-receive-data-4adf66

Step 2: ESP8266 Code explanation.

Set your FIREBASE_HOSTS, FIREBASE_AUTH, WIFI_SSID and WIFI_PASSWORD.

#define FIREBASE_AUTH "Your secret" 
#define FIREBASE_HOST "your FIREBASE HOST"
#define WIFI_SSID " your WIFI SSID"
#define WIFI_PASSWORD " your WIFI PASSWORD"

When your copy theFirebase host, remove " https:// "and"/" from the Firebase host.

for example

#define FIREBASE_HOST "werr-f374b.firebaseio.com"

Connect to WIFI code.

WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
 while (WiFi.status() != WL_CONNECTED) {
   delay(500);
 }

Initializes the serial connection at 9600 to get sensor data from arduino.

Serial.begin(9600);

Get sensor data from Arduino and put it into sensor_data variable.

while(Serial.available()){
       //get sensor data from serial
       sensor_data=Serial.readString(); 
       Sr=true;    
   }

Get commas indexes from values variable.

//get comma indexes from values variable
 int fristCommaIndex = values.indexOf(',');
 int secondCommaIndex = values.indexOf(',', fristCommaIndex+1);
 int thirdCommaIndex = values.indexOf(',', secondCommaIndex + 1);

Get sensors data from values variable by splitting by commas and put into variables

//get sensors data from values variable by  spliting by commas and put in to variables  
 String ultrasonic_value = values.substring(0, fristCommaIndex);
 String IR_sensor1_value = values.substring(fristCommaIndex+1, secondCommaIndex);
 String IR_sensor2_value = values.substring(secondCommaIndex+1);

Store sensor data as string in thefirebase real-time database.

//store ultrasonic sensor data as string in firebase 
 Firebase.setString("ultrasonic_value",ultrasonic_value);
  delay(10);
 //store IR sensor 1 data as string in firebase 
 Firebase.setString("IR_sensor1_value",IR_sensor1_value);
  delay(10);
 //store IR sensor 2 data as string in firebase 
 Firebase.setString("IR_sensor2_value",IR_sensor2_value);

Store previous sensors' data as strings in the firebase real-time database.

//store previous sensors data as string in firebase
 Firebase.pushString("previous_ultrasonic_value",ultrasonic_value);
  delay(10);
 Firebase.pushString("previous_IR_sensor1_value",IR_sensor1_value);
  delay(10);
 Firebase.pushString("previous_IR_sensor2_value",IR_sensor2_value);

Step 3: Connect ESP8266 to Arduino Uno.

Connect the pins.

The ESP8266 works with 3.3V and not 5V.

ESP8266:-------------- >Arduino:

GND -------------------------- GND

GPIO-2 (IO2) -------------------- Not connected (open)

GPIO-0 (IO0)---------------------GND

RX --------------------------------RX

TX ---------------------------------TX

CHPD (EN) ------------------------ 3.3V

RST -------------------------------- Not connected (open)

VCC (3v3) -------------------------- 3.3V

connect Arduino Uno RESET Pin to Uno's Ground/GND Pin.

Circuit diagram for to upload code to ESP8266 using Arduino.

Step 4 : Upload the ESP8266 code.

Before you upload ESP8266 code check following instructions.

Select ESP8266 board from Tools > Board menu.
Select right port from Tools > Port menu.
Select 115200 as a upload speed from Tools > upload speed menu.
Re check your pins.

If you fail to upload code, remove the serial Arduino cable and plug it again and retry to upload code. (retry more than three times)

If you want to upload new code, remove the serial Arduino cable and plug it again and upload the code.

For errors, please check out this video.

Step 5 : Connect your sensors to Arduino.

After uploading the ESP8266 code, remove the serial Arduino cable and take out GPIO-0 (IO0) from GND and Arduino Uno RESET Pin from Uno's Ground/GND Pin.

remove ESP8266 RX pin from uno's RX pin and ESP8266 TX pin from uno's TX pin.

For demonstration purposes I use two IR sensors and one ultrasonic sensor but you can use whatever you want sensors.

Connect the pins.

ESP8266:-------------- >Arduino:

GND -------------------------- GND

GPIO-0 (IO0)---------------------Not connected (open)

GPIO-2 (IO2) -------------------- Not connected (open)

RX -------------------------------- Not connected (open)

TX --------------------------------- Not connected (open)

CHPD (EN) ------------------------ 3.3V

RST -------------------------------- Not connected (open)

VCC (3v3) -------------------------- 3.3V

Sensors:-------------- >Arduino:

ultrasonic sensor VCC -------------------------- 5V

ultrasonic sensor GND --------------------------GND

ultrasonic sensor Trig-------------------------- 2

ultrasonic sensor Echo -------------------------- 3

IR sensor1 VCC -------------------------- 5V

IR sensor1 GND --------------------------GND

IR sensor1 AO-------------------------- A1

IR sensor2 VCC -------------------------- 5V

IR sensor2 GND --------------------------GND

IR sensor2 AO-------------------------- A2

Circuit diagram for 2 IR sensors, one ultrasonic sensor and ESP8266.

Step 6 :Arduino Uno Code explanation.

Initializes the serial connection at 9600 to sent sensor data to ESP8266.

Serial.begin(9600);

Get sensors data and put in to values variables as a string.

values= (get_distance_Value()+','+get_IR_sensor1_Value()+','+get_IR_sensor2_Value());

Removed any buffered previous serial data.

Serial.flush();

Sent sensors data to serial. (sent sensors data to ESP8266)

Serial.print(values);

Step 7 : Upload the Arduino Uno code.

Before you upload Arduino Uno code check following instructions.

Select Arduino Uno board from Tools > Board menu.
Select right port from Tools > Port menu.
Take out GPIO-0 (IO0) from GND and Arduino Uno RESET Pin from Uno's Ground/GND Pin.
Remove ESP8266 RX pin from uno's RX pin and ESP8266 TX pin from uno's TX pin.
Re check your pins.

Step 8 : Final step.

After uploading the code, remove the serial Arduino cable and connect ESP8266 RX pin to uno's TX pin and ESP8266 TX pin to uno's RX pin.

After that plug serial Arduino cable.

That's it, you are done!!!

check your database.

Also you can use Software serial, if you want.

If your sensors data is scramble in firebase increase delay in code.

example

delay(2500);

Code

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>

#define FIREBASE_AUTH "Your secret" 
#define FIREBASE_HOST "your FIREBASE HOST"
#define WIFI_SSID " your WIFI SSID"
#define WIFI_PASSWORD " your WIFI PASSWORD"

String values,sensor_data;

void setup() {
  //Initializes the serial connection at 9600 get sensor data from arduino.
   Serial.begin(9600);
   
  delay(1000);
  
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    
  }
  
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH); 
  
}
void loop() {

 bool Sr =false;
 
  while(Serial.available()){
    
        //get sensor data from serial put in sensor_data
        sensor_data=Serial.readString(); 
        Sr=true;    
        
    }
  
delay(1000);

  if(Sr==true){  
    
  values=sensor_data;
  
  //get comma indexes from values variable
  int fristCommaIndex = values.indexOf(',');
  int secondCommaIndex = values.indexOf(',', fristCommaIndex+1);
  int thirdCommaIndex = values.indexOf(',', secondCommaIndex + 1);
  
  //get sensors data from values variable by  spliting by commas and put in to variables  
  String ultrasonic_value = values.substring(0, fristCommaIndex);
  String IR_sensor1_value = values.substring(fristCommaIndex+1, secondCommaIndex);
  String IR_sensor2_value = values.substring(secondCommaIndex+1);

  //store ultrasonic sensor data as string in firebase 
  Firebase.setString("ultrasonic_value",ultrasonic_value);
   delay(10);
  //store IR sensor 1 data as string in firebase 
  Firebase.setString("IR_sensor1_value",IR_sensor1_value);
   delay(10);
  //store IR sensor 2 data as string in firebase 
  Firebase.setString("IR_sensor2_value",IR_sensor2_value);

  delay(10);
  
  //store previous sensors data as string in firebase
  
  Firebase.pushString("previous_ultrasonic_value",ultrasonic_value);
   delay(10);
  Firebase.pushString("previous_IR_sensor1_value",IR_sensor1_value);
   delay(10);
  Firebase.pushString("previous_IR_sensor2_value",IR_sensor2_value);
  
  
  delay(1000);
  
  if (Firebase.failed()) {  
      return;
  }
  
}   
}

#define IR_sensor1Pin A1 
#define IR_sensor2Pin A2 

int trigger_pin = 2;
int echo_pin = 3;
 
int IR_sensor1_Value;
int IR_sensor2_Value;
int time;
int distance; 
String values;

 void setup() { 
  
 pinMode (trigger_pin, OUTPUT); 
 
 pinMode (echo_pin, INPUT);
 
 //Initializes the serial connection at 9600 to sent sensor data to ESP8266.
 Serial.begin(9600); 
 
delay(2000);  
  
 }

 
void loop() {

  // get sensors data and put in to values variables as a string.
   values= (get_distance_Value()+','+get_IR_sensor1_Value()+','+get_IR_sensor2_Value());
       delay(1000);
       // removed any buffered previous serial data.
       Serial.flush();
       delay(1000);
       // sent sensors data to serial (sent sensors data to ESP8266)
       Serial.print(values);
       delay(2000);
 

}

// get Ultrasonic sensor data
String get_distance_Value(){  
 
 
    digitalWrite (trigger_pin, HIGH);

    delayMicroseconds (10);

    digitalWrite (trigger_pin, LOW);

    time = pulseIn (echo_pin, HIGH);

    distance = (time * 0.034) / 2;
      return String(distance);  
}

// get IR sensor 1 data
String get_IR_sensor1_Value(){ 
   
IR_sensor1_Value =analogRead(IR_sensor1Pin);
    delay(1000);
    return String(IR_sensor1_Value);  
    
}

// get IR sensor 2 data
String get_IR_sensor2_Value(){ 
   
IR_sensor2_Value =analogRead(IR_sensor2Pin);
delay(1000);
    return String(IR_sensor2_Value);  
}

Credits

Pulasthi Narada

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Send multiple sensors data to Firebase using ESP8266

Things used in this project

Hardware components

Software apps and online services

Story

Overview

In this tutorial, you will learn how to send multiple sensor data to Firebase real-time database using ESP8266 (ESP-01) module and Arduino UNO.

What You Will Learn

Step 1: Go to this link and connect ESP8266 to Firebase real-time database.

Step 2: ESP8266 Code explanation.

Step 3: Connect ESP8266 to Arduino Uno.

Step 4 : Upload the ESP8266 code.

Step 5 : Connect your sensors to Arduino.

Step 6 :Arduino Uno Code explanation.

Step 7 : Upload the Arduino Uno code.

Step 8 : Final step.

That's it, you are done!!!

Other useful links

Schematics

Circuit diagram for to upload code to ESP8266 using Arduino.

Circuit diagram for 2 IR sensors, one ultrasonic sensor and ESP8266.

Code

Code for ESP8266

Arduino Uno Code

Credits

Pulasthi Narada

Comments

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Send multiple sensors data to Firebase using ESP8266

Send multiple sensors data to Firebase using ESP8266

Things used in this project

Hardware components

Software apps and online services

Story

Overview

In this tutorial, you will learn how to send multiple sensor data to Firebase real-time database using ESP8266 (ESP-01) module and Arduino UNO.

What You Will Learn

Step 1: Go to this link and connect ESP8266 to Firebase real-time database.

Step 2: ESP8266 Code explanation.

Step 3: Connect ESP8266 to Arduino Uno.

Step 4 : Upload the ESP8266 code.

Step 5 : Connect your sensors to Arduino.

Step 6 :Arduino Uno Code explanation.

Step 7 : Upload the Arduino Uno code.

Step 8 : Final step.

That's it, you are done!!!

Other useful links

Schematics

Circuit diagram for to upload code to ESP8266 using Arduino.

Circuit diagram for 2 IR sensors, one ultrasonic sensor and ESP8266.

Code

Code for ESP8266

Arduino Uno Code

Credits

Pulasthi Narada

Comments

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