ESP32 UV Index Monitor (Educational Estimate)

// ESP32 VEML6075 estimated UV index monitor
// Educational estimate only; follow official weather and health guidance.
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_VEML6075.h>

Adafruit_VEML6075 uv = Adafruit_VEML6075();
Adafruit_SSD1306 oled(128, 64, &Wire, -1);

const char *uvBand(float estimatedUv) {
  if (estimatedUv < 3.0) return "Low estimate";
  if (estimatedUv < 6.0) return "Moderate estimate";
  if (estimatedUv < 8.0) return "High estimate";
  if (estimatedUv < 11.0) return "Very high estimate";
  return "Extreme estimate";
}

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);
  oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  oled.setTextColor(WHITE);

  if (!uv.begin()) {
    Serial.println("VEML6075 not found. Check 3.3 V, SDA GPIO21, and SCL GPIO22.");
    while (true) delay(10);
  }
  Serial.println("Estimated UV Index monitor ready. Educational use only.");
}

void loop() {
  float uva = uv.readUVA();
  float uvb = uv.readUVB();
  float estimatedUv = uv.readUVI();
  const char *band = uvBand(estimatedUv);

  Serial.printf("Estimated UV Index: %.1f  Band: %s  UVA raw: %.1f  UVB raw: %.1f\n",
                estimatedUv, band, uva, uvb);

  oled.clearDisplay();
  oled.setCursor(0, 0);
  oled.setTextSize(1);
  oled.println("Estimated UV Index");
  oled.setTextSize(2);
  oled.println(estimatedUv, 1);
  oled.setTextSize(1);
  oled.println(band);
  oled.println("Educational estimate");
  oled.display();

  delay(5000);
}