IV Drip Monitoring System Documentation

Summary

The IV Drip Monitoring System is designed to monitor the weight of IV fluid, control the flow using a servo motor, provide location data via a GPS module, and display information on an I2C LCD. The system alerts when the fluid level is low and displays the GPS location.

Component List

1. Load Cell - Red/white/black/green

   • Description: Measures the weight of the IV fluid.
   • Pins: E+, A-, E-, A+

2. HX711 - Bridge Sensor Interface

   • Description: Interface for the load cell to measure weight.
   • Pins: E+, E-, A-, A+, B-, B+, GND - GROUND, DATA (OUT), SCK - CLOCK (IN), 3.3/3.5V Supply

3. Tower Pro SG90 Servo

   • Description: Controls the flow of the IV fluid.
   • Pins: Signal, +5V, GND

4. GPS NEO 6M

   • Description: Provides GPS location data.
   • Pins: VCC, RX, TX, GND

5. 16x2 I2C LCD

   • Description: Displays information such as weight and GPS location.
   • Pins: GND, VCC, SDA, SCL

6. ESP32 (30 pin)

   • Description: Main microcontroller that interfaces with all components.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

Wiring Details

Load Cell - Red/white/black/green

• E+ connected to E+ of HX711
• A- connected to A- of HX711
• E- connected to E- of HX711
• A+ connected to A+ of HX711

HX711 - Bridge Sensor Interface

• E+ connected to E+ of Load Cell
• A- connected to A- of Load Cell
• E- connected to E- of Load Cell
• A+ connected to A+ of Load Cell
• GND - GROUND connected to GND of ESP32 and Tower Pro SG90 Servo
• DATA (OUT) connected to D5 of ESP32
• SCK - CLOCK (IN) connected to D4 of ESP32
• 3.3/3.5V Supply connected to 3V3 of ESP32

Tower Pro SG90 Servo

• Signal connected to D15 of ESP32
• +5V connected to Vin of ESP32
• GND connected to GND of ESP32 and HX711

GPS NEO 6M

• VCC connected to 3V3 of ESP32
• RX connected to D12 of ESP32
• TX connected to D13 of ESP32
• GND connected to GND of ESP32 and 16x2 I2C LCD

16x2 I2C LCD

• GND connected to GND of ESP32 and GPS NEO 6M
• VCC connected to Vin of ESP32
• SDA connected to D21 of ESP32
• SCL connected to D22 of ESP32

ESP32 (30 pin)

• D12 connected to RX of GPS NEO 6M
• D13 connected to TX of GPS NEO 6M
• GND connected to GND of 16x2 I2C LCD, GPS NEO 6M, Tower Pro SG90 Servo, and HX711
• Vin connected to +5V of Tower Pro SG90 Servo and VCC of 16x2 I2C LCD
• D22 connected to SCL of 16x2 I2C LCD
• D21 connected to SDA of 16x2 I2C LCD
• D5 connected to DATA (OUT) of HX711
• D4 connected to SCK - CLOCK (IN) of HX711
• D15 connected to Signal of Tower Pro SG90 Servo
• 3V3 connected to 3.3/3.5V Supply of HX711 and VCC of GPS NEO 6M

Documented Code

ESP32 (30 pin) Code

/*
 * IV Drip Monitoring System
 * This code interfaces with a load cell to measure the weight of the IV fluid,
 * a servo motor to control the flow, a GPS module to provide location data,
 * and an I2C LCD to display information. The system alerts when the fluid
 * level is low and displays the GPS location.
 */

#include <HX711.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <TinyGPS++.h>

// Initialize components
HX711 scale;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servo;
TinyGPSPlus gps;

// Define constants and pin mappings
const int LOADCELL_DOUT_PIN = 5;
const int LOADCELL_SCK_PIN = 4;
const int SERVO_PIN = 15;
const int GPS_RX_PIN = 13; // ESP32 RX pin for GPS TX
const int GPS_TX_PIN = 12; // ESP32 TX pin for GPS RX

HardwareSerial GPS(1); // Use UART1 for GPS communication

float weight = 0;

void setup() {
  // Serial and component setup
  Serial.begin(115200);
  lcd.begin();
  lcd.backlight();

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  servo.attach(SERVO_PIN);
  GPS.begin(9600, SERIAL_8N1, GPS_RX_PIN, GPS_TX_PIN);

  lcd.setCursor(0, 0);
  lcd.print("System Ready!");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read weight from load cell
  weight = scale.get_units();
  lcd.setCursor(0, 0);
  lcd.print("Weight: ");
  lcd.print(weight);
  lcd.print("g "); // Display weight with unit

  if (weight < 50) { // Threshold for low fluid level
    lcd.setCursor(0, 1);
    lcd.print("Low Fluid!    ");
    servo.write(0); // Stop clamp
    displayGPSLocation(); // Show GPS location
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Flow Normal   ");
    servo.write(90); // Allow fluid flow
  }

  delay(1000);
}

void displayGPSLocation() {
  while (GPS.available() > 0) {
    gps.encode(GPS.read()); // Parse GPS data

    if (gps.location.isUpdated()) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Lat: ");
      lcd.print(gps.location.lat(), 6); // Display latitude

      lcd.setCursor(0, 1);
      lcd.print("Lng: ");
      lcd.print(gps.location.lng(), 6); // Display longitude

      delay(5000); // Pause for readability
      lcd.clear();
    }
  }
}

GPS NEO 6M Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

16x2 I2C LCD Code

/*
 * IV Drip Monitoring System
 * This code interfaces with a load cell to measure the weight of the IV fluid,
 * a servo motor to control the flow, a GPS module to provide location data,
 * and an I2C LCD to display information. The system alerts when the fluid
 * level is low and displays the GPS location.
 */

#include <HX711.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <TinyGPS++.h>

// Initialize components
HX711 scale;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servo;
TinyGPSPlus gps;

// Define constants and pin mappings
const int LOADCELL_DOUT_PIN = 5;
const int LOADCELL_SCK_PIN = 4;
const int SERVO_PIN = 15;
const int GPS_RX_PIN = 13; // ESP32 RX pin for GPS TX
const int GPS_TX_PIN = 12; // ESP32 TX pin for GPS RX

HardwareSerial GPS(1); // Use UART1 for GPS communication

float weight = 0;

void setup() {
  // Serial and component setup