AHT20

// AHT20 on Arduino Uno: wiring and a free simulation at https://www.tinkered.ai/components/aht20
// AHT20 on an Arduino Uno: VIN 5V, SDA A4, SCL A5, address 0x38
#include <Wire.h>
#include <Adafruit_AHTX0.h>

Adafruit_AHTX0 aht;

void setup() {
  Serial.begin(115200);
  Wire.begin();
  delay(100);  // the AHT20 needs 100 ms after power-up before its first command
  if (!aht.begin()) {
    Serial.println("AHT20 not found at 0x38. Check wiring.");
    while (true) delay(10);
  }
  Serial.println("AHT20 ready");
}

void loop() {
  sensors_event_t humidity, temp;
  if (!aht.getEvent(&humidity, &temp)) {
    Serial.println("Read failed");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temp.temperature, 2);
    Serial.print(" C   Humidity: ");
    Serial.print(humidity.relative_humidity, 2);
    Serial.println(" %RH");
  }
  delay(2000);
}

// AHT20 on ESP32 DevKit V1: wiring and a free simulation at https://www.tinkered.ai/components/aht20
// AHT20 on an ESP32 DevKit V1: VIN 3V3, SDA GPIO21, SCL GPIO22, address 0x38
#include <Wire.h>
#include <Adafruit_AHTX0.h>

Adafruit_AHTX0 aht;

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA, SCL
  delay(100);  // the AHT20 needs 100 ms after power-up before its first command
  if (!aht.begin(&Wire)) {
    Serial.println("AHT20 not found at 0x38. Check wiring.");
    while (true) delay(10);
  }
  Serial.println("AHT20 ready");
}

void loop() {
  sensors_event_t humidity, temp;
  if (!aht.getEvent(&humidity, &temp)) {
    Serial.println("Read failed");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temp.temperature, 2);
    Serial.print(" C   Humidity: ");
    Serial.print(humidity.relative_humidity, 2);
    Serial.println(" %RH");
  }
  delay(2000);
}

// AHT20 on Raspberry Pi Pico: wiring and a free simulation at https://www.tinkered.ai/components/aht20
// AHT20 on a Raspberry Pi Pico (arduino-pico): VIN 3V3(OUT), SDA GP4, SCL GP5, address 0x38
#include <Wire.h>
#include <Adafruit_AHTX0.h>

Adafruit_AHTX0 aht;

void setup() {
  Serial.begin(115200);
  Wire.setSDA(4);
  Wire.setSCL(5);
  Wire.begin();
  delay(100);  // the AHT20 needs 100 ms after power-up before its first command
  if (!aht.begin(&Wire)) {
    Serial.println("AHT20 not found at 0x38. Check wiring.");
    while (true) delay(10);
  }
  Serial.println("AHT20 ready");
}

void loop() {
  sensors_event_t humidity, temp;
  if (!aht.getEvent(&humidity, &temp)) {
    Serial.println("Read failed");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temp.temperature, 2);
    Serial.print(" C   Humidity: ");
    Serial.print(humidity.relative_humidity, 2);
    Serial.println(" %RH");
  }
  delay(2000);
}