first commit

2026-09-27 17:21:39 +02:00 · 2026-09-27 17:21:39 +02:00 · e6a42e28e9
commit e6a42e28e9
4355 changed files with 4626605 additions and 0 deletions
--- a/libraries/DHT20/examples/DHT20_offset/DHT20_offset.ino
+++ b/libraries/DHT20/examples/DHT20_offset/DHT20_offset.ino
@ -0,0 +1,109 @@
+//
+//    FILE: DHT20_offset.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;
+
+uint8_t count = 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 pins 21 22
+
+  delay(1000);
+}
+
+
+void loop()
+{
+  //  set an offset after 10 seconds.
+  if (millis() > 10000)
+  {
+    DHT.setTempOffset(1.7);
+    DHT.setHumOffset(-2.3);
+  }
+
+  //  make a measurement every 2 seconds
+  if (millis() - DHT.lastRead() >= 2000)
+  {
+    //  READ DATA
+    uint32_t start = micros();
+    int status = DHT.read();
+    uint32_t stop = micros();
+
+    if ((count % 10) == 0)
+    {
+      count = 0;
+      Serial.println();
+      Serial.println("Type\tHumidity (%)\tTemp (°C)\tTime (µs)\tStatus\tOffset");
+    }
+    count++;
+
+    Serial.print("DHT20 \t");
+    //  DISPLAY DATA, sensor has only one decimal.
+    Serial.print(DHT.getHumidity(), 1);
+    Serial.print("\t\t");
+    Serial.print(DHT.getTemperature(), 1);
+    Serial.print("\t\t");
+    Serial.print(stop - start);
+    Serial.print("\t\t");
+    switch (status)
+    {
+      case DHT20_OK:
+        Serial.print("OK");
+        break;
+      case DHT20_ERROR_CHECKSUM:
+        Serial.print("Checksum error");
+        break;
+      case DHT20_ERROR_CONNECT:
+        Serial.print("Connect error");
+        break;
+      case DHT20_MISSING_BYTES:
+        Serial.print("Missing bytes");
+        break;
+      case DHT20_ERROR_BYTES_ALL_ZERO:
+        Serial.print("All bytes read zero");
+        break;
+      case DHT20_ERROR_READ_TIMEOUT:
+        Serial.print("Read time out");
+        break;
+      case DHT20_ERROR_LASTREAD:
+        Serial.print("Error read too fast");
+        break;
+      default:
+        Serial.print("Unknown error");
+        break;
+    }
+    Serial.print("\t");
+    Serial.print(DHT.getHumOffset());
+    Serial.print("\t");
+    Serial.print(DHT.getTempOffset());
+    Serial.print("\n");
+  }
+}
+
+
+//  -- END OF FILE --