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Mar 24,2023

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Altimeter Datalogger with Display.

Make a Datalogging Altimeter with a Display!

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Published: Mar 24,2023

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Topic

DIY Electronics

Arduino

3D Printing

3D printing Arduino ESP8266 DIY USB

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	Arduino_UNO_R3	x 1
	16x2 Display	x 1
	16x2 Display to I2C Converter.	x 1
	BMP280	x 1
	SPI SD Card Reader	x 1

	#include <Wire.h>
	#include <Adafruit_Sensor.h>
	#include <Adafruit_BMP280.h>
	#include <LiquidCrystal_I2C.h>
	#include <SD.h>

	#define LCD_COLUMNS 16
	#define LCD_ROWS 2

	#define LOG_FILE_NAME "altitude.log"
	#define LOG_INTERVAL 300 // Log interval in milliseconds

	Adafruit_BMP280 bmp; // Create BMP280 object
	LiquidCrystal_I2C lcd(0x27, LCD_COLUMNS, LCD_ROWS); // Initialize LCD
	File logFile; // Create log file object

	float maxAltitude = 0.0; // Initialize maximum altitude variable



	void setup() {
	Serial.begin(9600); // Start serial communication
	lcd.init(); // Initialize LCD
	lcd.backlight(); // Turn on LCD backlight
	if (!bmp.begin(0x76)) { // Initialize BMP280 with I2C address 0x76
	Serial.println("Could not find a valid BMP280 sensor, check wiring!");
	while (1);
	}
	if (!SD.begin(10)) { // Initialize microSD card with pin 10
	Serial.println("Could not initialize SD card, check wiring!");

	}
	logFile = SD.open(LOG_FILE_NAME, FILE_WRITE); // Open log file for writing
	logFile.println("Time,Altitude"); // Write header to log file
	logFile.close();


	}

	void loop() {
	static unsigned long lastLogTime = 0; // Initialize last log time variable
	unsigned long currentTime = millis(); // Get current time in milliseconds
	float temperature = bmp.readTemperature(); // Read temperature in Celsius
	float pressure = bmp.readPressure() / 100.0; // Read pressure in hPa
	float altitude = bmp.readAltitude(1012.7); // Read altitude in meters relative to sea level

	// Update maximum altitude
	if (altitude > maxAltitude) {
	maxAltitude = altitude;
	}

	// Print readings to serial monitor


	Serial.print("Temperature = ");
	Serial.print(temperature);
	Serial.println(" °C");

	Serial.print("Pressure = ");
	Serial.print(pressure);
	Serial.println(" hPa");

	Serial.print("Altitude = ");
	Serial.print(altitude);
	Serial.println(" meters");

	// Update LCD display
	lcd.clear();
	lcd.setCursor(0, 0);
	lcd.print("Max Altitude:");
	lcd.setCursor(0, 1);
	lcd.print(maxAltitude);
	lcd.print(" meters");

	// Log altitude every 0.3 seconds
	if (currentTime - lastLogTime >= LOG_INTERVAL) {
	logFile = SD.open(LOG_FILE_NAME, FILE_WRITE); // Open log file for writing
	logFile.print(currentTime / 1000.0); // Write time in seconds
	logFile.print(",");
	logFile.println(altitude); // Write altitude
	logFile.close();
	lastLogTime = currentTime; // Update last log time
	}

	delay(100); // Wait for 0.1 second before reading again
	}

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Altimeter Datalogger with Display.

Building Tutorial