Send sensor data from one Arduino to another using Firebase

Connect two Arduinos via Firebase real-time database to send sensor data from one and display it onto an LCD in the other one.

Nov 10, 2021

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Components and supplies

Breadboard (generic)

ESP8266 ESP-01

I2C 16x2 Arduino LCD Display Module

Arduino UNO

Male/Female Jumper Wires

DHT11 Temperature & Humidity Sensor (3 pins)

Apps and platforms

Arduino IDE

Firebase

Project description

Code

sensor_esp8266.ino

arduino

Sensor_ESP8266_Code

1#include <ESP8266WiFi.h>
2#include <FirebaseArduino.h>
3
4#define  FIREBASE_HOST "YOUR_FIREBASE_LINK"
5#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
6#define  WIFI_SSID "YOUR_WIFI_SSID"
7#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"
8
9String  sensor_data, values;
10
11void setup() {
12
13
14  delay(1000);
15
16  //  connect to wifi.
17  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
18  while (WiFi.status()  != WL_CONNECTED) {
19    delay(500);
20  }
21  Serial.begin(9600);
22  Firebase.begin(FIREBASE_HOST,  FIREBASE_AUTH);
23
24}
25
26void loop() {
27
28  bool Sr = false;
29
30  while (Serial.available()) {
31
32    //get sensor data from serial put in sensor_data
33    sensor_data = Serial.readString();
34    Sr = true;
35
36  }
37
38  delay(1000);
39
40  if (Sr == true) {
41
42    values = sensor_data;
43
44    //get comma indexes  from values variable
45    int fristCommaIndex = values.indexOf(',');
46    int  secondCommaIndex = values.indexOf(',', fristCommaIndex + 1);
47
48    //get sensors  data from values variable by  spliting by commas and put in to variables
49    String  temperature = values.substring(0, fristCommaIndex);
50    String humidity = values.substring(fristCommaIndex  + 1, secondCommaIndex);
51
52    //store ultrasonic sensor data as string in firebase
53    Firebase.setString("temperature", temperature);
54    delay(10);
55    //store  IR sensor 1 data as string in firebase
56    Firebase.setString("humidity", humidity);
57    delay(10);
58    
59    //store previous sensors data as string in firebase
60
61    delay(1000);
62
63    if (Firebase.failed()) {
64      return;
65    }
66
67  }
68}
69

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

#define  FIREBASE_HOST "YOUR_FIREBASE_LINK"
#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
#define  WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"

String  sensor_data, values;

void setup() {


  delay(1000);

  //  connect to wifi.
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status()  != WL_CONNECTED) {
    delay(500);
  }
  Serial.begin(9600);
  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);

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

    //store ultrasonic sensor data as string in firebase
    Firebase.setString("temperature", temperature);
    delay(10);
    //store  IR sensor 1 data as string in firebase
    Firebase.setString("humidity", humidity);
    delay(10);
    
    //store previous sensors data as string in firebase

    delay(1000);

    if (Firebase.failed()) {
      return;
    }

  }
}

lcd_arduino.ino

arduino

Arduino_LCD_Code

1#include <LiquidCrystal_I2C.h>
2#include <Wire.h>
3
4// initialize  the library by associating any needed LCD interface pin
5// with the arduino pin  number it is connected to
6LiquidCrystal_I2C lcd(0x3F, 20, 4);
7String values,  sensor_data;
8
9void setup() {
10  Serial.begin(9600);
11  delay(2000);
12  // set up the LCD's number of columns and rows:
13  lcd.begin(20, 4);
14  //  Print a message to the LCD.
15  lcd.init(); // initialize the lcd
16  lcd.backlight();
17  delay(2000);
18  lcd.setCursor(0, 0); lcd.print("Temperature: " );
19  delay(10);
20  lcd.setCursor(18, 0); lcd.print("C");
21  delay(10);
22
23  lcd.setCursor(0,  1); lcd.print("Humidity: ");
24  delay(10);
25  lcd.setCursor(15, 1); lcd.print("%");
26  delay(2000);
27
28}
29
30void loop() {
31
32
33  bool Sr = false;
34
35  while (Serial.available()) {
36
37    //get sensor data from serial put in sensor_data
38    sensor_data = Serial.readString();
39    Sr = true;
40
41  }
42
43  delay(1000);
44
45  if (Sr == true) {
46
47    values = sensor_data;
48
49    //get sensors data  from values variable by spliting by commas and put in to variables
50    String  temperature = values.substring(0, 5);
51    String humidity = values.substring(6,  11);
52
53
54    initialize();
55    lcd.setCursor(13, 0);
56    delay(10);
57    lcd.print(temperature);//set cursor to print temperature
58    delay(10);
59    lcd.setCursor(10, 1);
60    delay(10);
61    lcd.print(humidity);
62
63  }
64  delay(2000);
65
66}
67void initialize() {
68  lcd.clear();
69  lcd.setCursor(0,  0); lcd.print("Temperature: " );
70  delay(10);
71  lcd.setCursor(18, 0); lcd.print("C");
72  delay(10);
73
74  lcd.setCursor(0, 1); lcd.print("Humidity: ");
75  delay(10);
76  lcd.setCursor(15, 1); lcd.print("%");
77}
78

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

// initialize  the library by associating any needed LCD interface pin
// with the arduino pin  number it is connected to
LiquidCrystal_I2C lcd(0x3F, 20, 4);
String values,  sensor_data;

void setup() {
  Serial.begin(9600);
  delay(2000);
  // set up the LCD's number of columns and rows:
  lcd.begin(20, 4);
  //  Print a message to the LCD.
  lcd.init(); // initialize the lcd
  lcd.backlight();
  delay(2000);
  lcd.setCursor(0, 0); lcd.print("Temperature: " );
  delay(10);
  lcd.setCursor(18, 0); lcd.print("C");
  delay(10);

  lcd.setCursor(0,  1); lcd.print("Humidity: ");
  delay(10);
  lcd.setCursor(15, 1); lcd.print("%");
  delay(2000);

}

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 sensors data  from values variable by spliting by commas and put in to variables
    String  temperature = values.substring(0, 5);
    String humidity = values.substring(6,  11);


    initialize();
    lcd.setCursor(13, 0);
    delay(10);
    lcd.print(temperature);//set cursor to print temperature
    delay(10);
    lcd.setCursor(10, 1);
    delay(10);
    lcd.print(humidity);

  }
  delay(2000);

}
void initialize() {
  lcd.clear();
  lcd.setCursor(0,  0); lcd.print("Temperature: " );
  delay(10);
  lcd.setCursor(18, 0); lcd.print("C");
  delay(10);

  lcd.setCursor(0, 1); lcd.print("Humidity: ");
  delay(10);
  lcd.setCursor(15, 1); lcd.print("%");
}

lcd_esp8266.ino

arduino

ESP8266_LCD_Code

1#include <ESP8266WiFi.h>
2#include <FirebaseArduino.h>
3
4
5#define  FIREBASE_HOST "YOUR_FIREBASE_LINK"
6#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
7#define  WIFI_SSID "YOUR_WIFI_SSID"
8#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"
9
10String  values;
11
12void setup() {
13  Serial.begin(9600);
14
15  // connect to wifi.
16  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
17  while (WiFi.status() != WL_CONNECTED)  {
18    delay(500);
19  }
20
21  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
22
23
24}
25
26void  loop() {
27
28
29  String temperature = Firebase.getString("temperature");
30  String humidity = Firebase.getString("humidity");
31
32  temperature = temperature.substring(0,  5);
33  humidity = humidity.substring(0, 5);
34  values = (temperature + humidity);
35  delay(10);
36
37
38  // always flush before printing
39  Serial.flush();
40  delay(1000);
41
42  Serial.print(values);
43  delay(1000);
44
45
46}
47

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


#define  FIREBASE_HOST "YOUR_FIREBASE_LINK"
#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
#define  WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"

String  values;

void setup() {
  Serial.begin(9600);

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

  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);


}

void  loop() {


  String temperature = Firebase.getString("temperature");
  String humidity = Firebase.getString("humidity");

  temperature = temperature.substring(0,  5);
  humidity = humidity.substring(0, 5);
  values = (temperature + humidity);
  delay(10);


  // always flush before printing
  Serial.flush();
  delay(1000);

  Serial.print(values);
  delay(1000);


}

sensor_arduino.ino

arduino

Arduino_Sensor_Code

1#include <SoftwareSerial.h>
2#include <dht.h>
3#define dht_apin A0
4
5dht  DHT;
6String values;
7
8void setup() {
9  Serial.begin(9600);
10  delay(5000);  //Delay to let system boot
11
12}
13
14void loop() {
15
16  DHT.read11(dht_apin);
17  values = (String(DHT.temperature) + ',' + String(DHT.humidity));
18  delay(10);
19  
20  Serial.flush();
21  delay(1000);
22
23  // sent sensors data to serial  (sent sensors data to ESP8266)
24  Serial.print(values);
25  delay(2000);
26
27}
28

#include <SoftwareSerial.h>
#include <dht.h>
#define dht_apin A0

dht  DHT;
String values;

void setup() {
  Serial.begin(9600);
  delay(5000);  //Delay to let system boot

}

void loop() {

  DHT.read11(dht_apin);
  values = (String(DHT.temperature) + ',' + String(DHT.humidity));
  delay(10);
  
  Serial.flush();
  delay(1000);

  // sent sensors data to serial  (sent sensors data to ESP8266)
  Serial.print(values);
  delay(2000);

}

sensor_esp8266.ino

arduino

Sensor_ESP8266_Code

1#include <ESP8266WiFi.h>
2#include <FirebaseArduino.h>
3
4#define   FIREBASE_HOST "YOUR_FIREBASE_LINK"
5#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
6#define   WIFI_SSID "YOUR_WIFI_SSID"
7#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"
8
9String   sensor_data, values;
10
11void setup() {
12
13
14  delay(1000);
15
16  //   connect to wifi.
17  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
18  while (WiFi.status()   != WL_CONNECTED) {
19    delay(500);
20  }
21  Serial.begin(9600);
22  Firebase.begin(FIREBASE_HOST,   FIREBASE_AUTH);
23
24}
25
26void loop() {
27
28  bool Sr = false;
29
30   while (Serial.available()) {
31
32    //get sensor data from serial put in sensor_data
33     sensor_data = Serial.readString();
34    Sr = true;
35
36  }
37
38  delay(1000);
39
40   if (Sr == true) {
41
42    values = sensor_data;
43
44    //get comma indexes   from values variable
45    int fristCommaIndex = values.indexOf(',');
46    int   secondCommaIndex = values.indexOf(',', fristCommaIndex + 1);
47
48    //get sensors   data from values variable by  spliting by commas and put in to variables
49    String   temperature = values.substring(0, fristCommaIndex);
50    String humidity = values.substring(fristCommaIndex   + 1, secondCommaIndex);
51
52    //store ultrasonic sensor data as string in firebase
53     Firebase.setString("temperature", temperature);
54    delay(10);
55    //store   IR sensor 1 data as string in firebase
56    Firebase.setString("humidity", humidity);
57     delay(10);
58    
59    //store previous sensors data as string in firebase
60
61     delay(1000);
62
63    if (Firebase.failed()) {
64      return;
65    }
66
67   }
68}
69

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

#define   FIREBASE_HOST "YOUR_FIREBASE_LINK"
#define FIREBASE_AUTH "YOUR_FIREBASE_TOKEN"
#define   WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"

String   sensor_data, values;

void setup() {


  delay(1000);

  //   connect to wifi.
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status()   != WL_CONNECTED) {
    delay(500);
  }
  Serial.begin(9600);
  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);

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

    //store ultrasonic sensor data as string in firebase
     Firebase.setString("temperature", temperature);
    delay(10);
    //store   IR sensor 1 data as string in firebase
    Firebase.setString("humidity", humidity);
     delay(10);
    
    //store previous sensors data as string in firebase

     delay(1000);

    if (Firebase.failed()) {
      return;
    }

   }
}

lcd_arduino.ino

arduino

Arduino_LCD_Code

1#include <LiquidCrystal_I2C.h>
2#include <Wire.h>
3
4// initialize   the library by associating any needed LCD interface pin
5// with the arduino pin   number it is connected to
6LiquidCrystal_I2C lcd(0x3F, 20, 4);
7String values,   sensor_data;
8
9void setup() {
10  Serial.begin(9600);
11  delay(2000);
12   // set up the LCD's number of columns and rows:
13  lcd.begin(20, 4);
14  //   Print a message to the LCD.
15  lcd.init(); // initialize the lcd
16  lcd.backlight();
17   delay(2000);
18  lcd.setCursor(0, 0); lcd.print("Temperature: " );
19  delay(10);
20   lcd.setCursor(18, 0); lcd.print("C");
21  delay(10);
22
23  lcd.setCursor(0,   1); lcd.print("Humidity: ");
24  delay(10);
25  lcd.setCursor(15, 1); lcd.print("%");
26   delay(2000);
27
28}
29
30void loop() {
31
32
33  bool Sr = false;
34
35   while (Serial.available()) {
36
37    //get sensor data from serial put in sensor_data
38     sensor_data = Serial.readString();
39    Sr = true;
40
41  }
42
43  delay(1000);
44
45   if (Sr == true) {
46
47    values = sensor_data;
48
49    //get sensors data   from values variable by spliting by commas and put in to variables
50    String   temperature = values.substring(0, 5);
51    String humidity = values.substring(6,   11);
52
53
54    initialize();
55    lcd.setCursor(13, 0);
56    delay(10);
57     lcd.print(temperature);//set cursor to print temperature
58    delay(10);
59     lcd.setCursor(10, 1);
60    delay(10);
61    lcd.print(humidity);
62
63   }
64  delay(2000);
65
66}
67void initialize() {
68  lcd.clear();
69  lcd.setCursor(0,   0); lcd.print("Temperature: " );
70  delay(10);
71  lcd.setCursor(18, 0); lcd.print("C");
72   delay(10);
73
74  lcd.setCursor(0, 1); lcd.print("Humidity: ");
75  delay(10);
76   lcd.setCursor(15, 1); lcd.print("%");
77}
78

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

// initialize   the library by associating any needed LCD interface pin
// with the arduino pin   number it is connected to
LiquidCrystal_I2C lcd(0x3F, 20, 4);
String values,   sensor_data;

void setup() {
  Serial.begin(9600);
  delay(2000);
   // set up the LCD's number of columns and rows:
  lcd.begin(20, 4);
  //   Print a message to the LCD.
  lcd.init(); // initialize the lcd
  lcd.backlight();
   delay(2000);
  lcd.setCursor(0, 0); lcd.print("Temperature: " );
  delay(10);
   lcd.setCursor(18, 0); lcd.print("C");
  delay(10);

  lcd.setCursor(0,   1); lcd.print("Humidity: ");
  delay(10);
  lcd.setCursor(15, 1); lcd.print("%");
   delay(2000);

}

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 sensors data   from values variable by spliting by commas and put in to variables
    String   temperature = values.substring(0, 5);
    String humidity = values.substring(6,   11);


    initialize();
    lcd.setCursor(13, 0);
    delay(10);
     lcd.print(temperature);//set cursor to print temperature
    delay(10);
     lcd.setCursor(10, 1);
    delay(10);
    lcd.print(humidity);

   }
  delay(2000);

}
void initialize() {
  lcd.clear();
  lcd.setCursor(0,   0); lcd.print("Temperature: " );
  delay(10);
  lcd.setCursor(18, 0); lcd.print("C");
   delay(10);

  lcd.setCursor(0, 1); lcd.print("Humidity: ");
  delay(10);
   lcd.setCursor(15, 1); lcd.print("%");
}

sensor_arduino.ino

arduino

Arduino_Sensor_Code

1#include <SoftwareSerial.h>
2#include <dht.h>
3#define dht_apin A0
4
5dht   DHT;
6String values;
7
8void setup() {
9  Serial.begin(9600);
10  delay(5000);   //Delay to let system boot
11
12}
13
14void loop() {
15
16  DHT.read11(dht_apin);
17   values = (String(DHT.temperature) + ',' + String(DHT.humidity));
18  delay(10);
19   
20  Serial.flush();
21  delay(1000);
22
23  // sent sensors data to serial   (sent sensors data to ESP8266)
24  Serial.print(values);
25  delay(2000);
26
27}
28

#include <SoftwareSerial.h>
#include <dht.h>
#define dht_apin A0

dht   DHT;
String values;

void setup() {
  Serial.begin(9600);
  delay(5000);   //Delay to let system boot

}

void loop() {

  DHT.read11(dht_apin);
   values = (String(DHT.temperature) + ',' + String(DHT.humidity));
  delay(10);
   
  Serial.flush();
  delay(1000);

  // sent sensors data to serial   (sent sensors data to ESP8266)
  Serial.print(values);
  delay(2000);

}

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