ESP32 weather station

weatherstation.ino

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define SEALEVELPRESSURE_HPA (1013.25)

// For the ESP-WROVER_KIT, these are the default.
#define TFT_CS   22
#define TFT_DC   21
#define TFT_MOSI 23
#define TFT_CLK  19
#define TFT_RST  18
#define TFT_MISO 25
#define TFT_LED   5  // GPIO not managed by library

#define I2C_SDA   12
#define I2C_SCL   13

Adafruit_BME280 bme; // I2C

unsigned long delayTime;

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

void backlighting(bool state) {
    if (state) {
        digitalWrite(TFT_LED, LOW);
    }
    else {
        digitalWrite(TFT_LED, HIGH);
    }
}

void setupTft() {
    pinMode(TFT_LED, OUTPUT);
    backlighting(true);
    SPI.begin(TFT_CLK, TFT_MISO, TFT_MOSI, -1);
    tft.begin();
    tft.fillScreen(ILI9341_BLACK);
}

void setup() {
    Serial.begin(115200);
    Serial.println("Weather Station Project");

    // adjust pins to match wiring and avoid overlap with screen
    Wire.begin(I2C_SDA, I2C_SCL);

    if (! bme.begin(0x76)) {
        Serial.println("Could not find a valid BME280 sensor, check wiring!");
        while (1);
    }

    // weather monitoring
    Serial.println("-- BME280 Weather Station Scenario --");
    Serial.println("forced mode, 1x temperature / 1x humidity / 1x pressure oversampling,");
    Serial.println("filter off");
    bme.setSampling(Adafruit_BME280::MODE_FORCED,
                    Adafruit_BME280::SAMPLING_X1, // temperature
                    Adafruit_BME280::SAMPLING_X1, // pressure
                    Adafruit_BME280::SAMPLING_X1, // humidity
                    Adafruit_BME280::FILTER_OFF   );
                      
    // suggested rate is 1/60Hz (1m)
    delayTime = 60000; // in milliseconds

    Serial.println("-- Setup TFT --");
    setupTft();

    // read diagnostics (optional but can help debug problems)
    uint8_t x = tft.readcommand8(ILI9341_RDMODE);
    Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX);
    x = tft.readcommand8(ILI9341_RDMADCTL);
    Serial.print("MADCTL Mode: 0x"); Serial.println(x, HEX);
    x = tft.readcommand8(ILI9341_RDPIXFMT);
    Serial.print("Pixel Format: 0x"); Serial.println(x, HEX);
    x = tft.readcommand8(ILI9341_RDIMGFMT);
    Serial.print("Image Format: 0x"); Serial.println(x, HEX);
    x = tft.readcommand8(ILI9341_RDSELFDIAG);
    Serial.print("Self Diagnostic: 0x"); Serial.println(x, HEX);     
}


void loop() {
    // Only needed in forced mode! In normal mode, you can remove the next line.
    bme.takeForcedMeasurement(); // has no effect in normal mode
    
    printValues();
    delay(delayTime);
}


void printValues() {
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");

    Serial.print("Pressure = ");

    Serial.print(bme.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println(" m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
}