Arduino monitor water level with NodeMCU ESP8266 + Firebase + Blynk

This project to check water level in tank if water level < 20% pump will start and when water level > 80% pump will stop with HC-SR04 ultrasonic sensor, show data in 0.96 inch OLED Display and send distance to firebase realtime database for React dash board in next project, with Blynk.

Dashbased for monitor by Reacjs: https://github.com/kreangsak-project-sharing/react-dashboard-water-level

Arduino Library use

1. Arduino core for ESP8266 WiFi chip: https://github.com/esp8266/Arduino
2. Firebase Realtime Database Arduino Library for ESP8266 and RP2040 Pico: https://github.com/mobizt/Firebase-ESP8266
3. Adafruit_SSD1306: https://github.com/adafruit/Adafruit_SSD1306
4. Blynk Library: https://docs.blynk.io/en/blynk-library-firmware-api/installation/install-blynk-library-in-arduino-ide

Need to change code before use

#define BLYNK_TEMPLATE_ID           "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
#define BLYNK_TEMPLATE_NAME         "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
#define BLYNK_AUTH_TOKEN            "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"

#define FIREBASE_HOST "Firebase database URL"
#define FIREBASE_AUTH "Database Secrets"

#define WIFI_SSID "Wifi Username"
#define WIFI_PASSWORD "Wifi Password"

IPAddress ip(192, 168, 0, 100); //Wifi IPAddress

int maxDist = 1000; // Tank Height or full water level you need in millimeters

Schematic

Pin wiring for LED & Relay Pump

LED & Relay	NodeMCU ESP8266	Remark
LED Wifi Status	D3	Check wifi connection
LED Pump Working	D4	Check pump working
LED Pump Stop	D5	Check pump stop
Pump Start for Relay	D6	Replace this to relay

Pin Wiring for HC-SR04

HC-SR04 Pin	NodeMCU ESP8266
VCC	VU
TRIG	D7
ECHO	D8
GND	GND

Pin wiring for 0.96 inch OLED Display

0.96 inch OLED Display	NodeMCU ESP8266
GND	GND
VDD	3V
SCK	GPIO 5 (D1)
SDA	GPIO 4 (D2)

Result in firebase realtime database

• Can change pumpstartmanual state to ture for start pump when water level < 80%
• Can change pumpstopmanual state to ture for stop pump
• Can change resetboard state to ture for restart board

Blynk App Setup

1. Login to https://blynk.cloud/dashboard/login
2. Add datastreams value as picture, in mobile app will show follow this.

3. Login Blynk app in mobile, create dashboard interface and add datastreams

Project photo

Other project

• Dashbased for monitor by Reacjs: https://github.com/kreangsak-project-sharing/react-dashboard-water-level
• Arduino monitor water level with NodeMCU ESP8266 + firebase: https://github.com/kreangsak-project-sharing/arduino-water-level-firebase-realtime