Project Documentation

ESP32-Based Smart Water Monitoring System with OLED Display and Wi-Fi Connectivity

Circuit Documentation

Summary

This circuit is designed to monitor water flow and temperature, display the data on an OLED screen, and control a WS2812 RGB LED strip based on the water flow rate. The system is powered by a 2000mAh battery and includes a TP4056 battery charging protection module and an MT3608 step-up converter. The ESP32 microcontroller is the central unit that interfaces with all sensors and peripherals, and it also connects to the internet via Wi-Fi to send data to a Blynk server.

Component List

ESP32
- Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
- Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT
Water Flow Sensor
- Description: A sensor to measure the flow rate of water.
- Pins: Signal, Vcc, GND
0.96" OLED
- Description: A small OLED display for showing data.
- Pins: GND, VDD, SCK, SDA
Temperature Sensor
- Description: A sensor to measure the temperature of water.
- Pins: Temp GND Black, Temp VDD Red, Temp DQ Data Yellow
Pushbutton
- Description: A simple pushbutton for user input.
- Pins: Pin 2, Pin 1, Pin 3, Pin 4
WS2812 RGB LED Strip
- Description: An addressable RGB LED strip.
- Pins: DIN, 5V, GND, DO
2000mAh Battery
- Description: A rechargeable battery to power the circuit.
- Pins: VCC, GND
TP4056 Battery Charging Protection Module (Type C)
- Description: A module for charging and protecting the battery.
- Pins: OUT +, B+, B-, OUT -, +, -
MT3608
- Description: A step-up converter to boost the battery voltage.
- Pins: VIN+, VIN-, VOUT+, VOUT-

Wiring Details

ESP32

GND connected to:
- TP4056 Battery Charging Protection Module (Type C) OUT -
- Water Flow Sensor GND
- MT3608 VIN-
- Pushbutton Pin 2
- Temperature Sensor Temp GND Black
- 0.96" OLED GND
VIN connected to:
- MT3608 VIN+
- TP4056 Battery Charging Protection Module (Type C) OUT +
- Water Flow Sensor Vcc
- Temperature Sensor Temp VDD Red
3V3 connected to:
- 0.96" OLED VDD
D15 connected to:
- Temperature Sensor Temp DQ Data Yellow
D2 connected to:
- Water Flow Sensor Signal
D4 connected to:
- Pushbutton Pin 3
D5 connected to:
- WS2812 RGB LED Strip DIN
D21 connected to:
- 0.96" OLED SDA
D22 connected to:
- 0.96" OLED SCK

Water Flow Sensor

GND connected to:
- ESP32 GND
- TP4056 Battery Charging Protection Module (Type C) OUT -
Vcc connected to:
- ESP32 VIN
- MT3608 VIN+
Signal connected to:
- ESP32 D2

0.96" OLED

GND connected to:
- ESP32 GND
- MT3608 VIN-
VDD connected to:
- ESP32 3V3
SCK connected to:
- ESP32 D22
SDA connected to:
- ESP32 D21

Temperature Sensor

Temp GND Black connected to:
- ESP32 GND
- MT3608 VIN-
Temp VDD Red connected to:
- ESP32 VIN
- MT3608 VIN+
Temp DQ Data Yellow connected to:
- ESP32 D15

Pushbutton

Pin 2 connected to:
- ESP32 GND
- MT3608 VIN-
Pin 3 connected to:
- ESP32 D4

WS2812 RGB LED Strip

DIN connected to:
- ESP32 D5
5V connected to:
- MT3608 VOUT+
GND connected to:
- MT3608 VOUT-

2000mAh Battery

VCC connected to:
- TP4056 Battery Charging Protection Module (Type C) B+
GND connected to:
- TP4056 Battery Charging Protection Module (Type C) B-

TP4056 Battery Charging Protection Module (Type C)

OUT - connected to:
- ESP32 GND
- Water Flow Sensor GND
OUT + connected to:
- ESP32 VIN
- MT3608 VIN+
- Water Flow Sensor Vcc
- Temperature Sensor Temp VDD Red
B+ connected to:
- 2000mAh Battery VCC
B- connected to:
- 2000mAh Battery GND

MT3608

VIN+ connected to:
- TP4056 Battery Charging Protection Module (Type C) OUT +
- ESP32 VIN
- Water Flow Sensor Vcc
- Temperature Sensor Temp VDD Red
VIN- connected to:
- ESP32 GND
- Pushbutton Pin 2
- Temperature Sensor Temp GND Black
- 0.96" OLED GND
VOUT+ connected to:
- WS2812 RGB LED Strip 5V
VOUT- connected to:
- WS2812 RGB LED Strip GND

Code Documentation

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Adafruit_NeoPixel.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

// OLED configuration
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Water flow sensor configuration
#define WATER_SENSOR_PIN 2
volatile int pulseCount = 0;
float flowRate = 0.0;
float waterConsumed = 0.0; // Liters

// Temperature sensor configuration
#define TEMP_SENSOR_PIN 15
OneWire oneWire(TEMP_SENSOR_PIN);
DallasTemperature tempSensor(&oneWire);

// Button configuration
#define BUTTON_PIN 4
volatile bool displayMode = 0; // 0 for Water Consumption, 1 for Temperature
volatile bool buttonPressed = false;

// NeoPixel configuration
#define NEOPIXEL_PIN 5
#define NUMPIXELS 16
Adafruit_NeoPixel strip(NUMPIXELS, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

// Wi-Fi and Blynk credentials
char auth[] = "YourBlynkAuthToken"; // Replace with your Blynk authentication token
char ssid[] = "YourWiFiSSID";       // Replace with your WiFi SSID
char pass[] = "YourWiFiPassword";   // Replace with your WiFi password

// Constants
const float calibrationFactor = 4.5; // Sensor-specific value
unsigned long lastTime = 0;
const unsigned long interval = 1000; // Update every second
unsigned long lastActivityTime = 0;  // OLED sleep timer
bool oledActive = true;

// Animations
int animationStep = 0;

// Function prototypes
void IRAM_ATTR pulseCounter();
void IRAM_ATTR handleButtonPress();
void updateNeoPixel(float flowRate);
void drawWaterAnimation();
void wakeOLED();

void setup() {
  Serial.begin(115200);

  // OLED initialization
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("Failed to initialize OLED");
    for (;;);
  }
  display.clearDisplay();
  display.display();

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10, 10);
  display.println("Initializing AquaTrack...");
  display.display();
  delay(2000);

  // Water flow sensor setup
  pinMode(WATER_SENSOR_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(WATER_SENSOR_PIN), pulseCounter, FALLING);

  // Temperature sensor setup
  tempSensor.begin();

  // Button setup
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), handle