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libraries/DHT20/examples/DHT20_async/DHT20_async.ino

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+//
+//    FILE: DHT20_async.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
+//     URL: https://github.com/RobTillaart/DHT20
+//
+//  Always check datasheet - front view
+//
+//          +--------------+
+//  VDD ----| 1            |
+//  SDA ----| 2    DHT20   |
+//  GND ----| 3            |
+//  SCL ----| 4            |
+//          +--------------+
+
+
+#include "DHT20.h"
+
+DHT20 DHT;
+
+uint32_t counter = 0;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("DHT20 LIBRARY VERSION: ");
+  Serial.println(DHT20_LIB_VERSION);
+  Serial.println();
+
+  Wire.begin();
+  Wire.setClock(400000);
+
+  DHT.begin();  //  ESP32 default 21, 22
+
+  delay(2000);
+
+  //  start with initial request
+  Serial.println(DHT.requestData());
+}
+
+
+void loop()
+{
+  uint32_t now = millis();
+
+  if (now - DHT.lastRead() > 1000)
+  {
+    DHT.readData();
+    DHT.convert();
+
+    Serial.print(DHT.getHumidity(), 1);
+    Serial.print(" %RH \t");
+    Serial.print(DHT.getTemperature(), 1);
+    Serial.print(" °C\t");
+    Serial.print(counter);
+    Serial.print("\n");
+    //  new request
+    counter = 0;
+    DHT.requestData();
+  }
+
+  //  other code here
+  counter++;  //  dummy counter to show async behaviour
+}
+
+
+//  -- END OF FILE --