add DHT20 RP2040 example

libraries/DHT20/examples/DHT20_test_rp2040/.arduino-ci.yml

@@ -0,0 +1,28 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    # - uno
+    # - due
+    # - zero
+    # - leonardo
+    # - m4
+    # - esp32
+    # - esp8266
+    # - mega2560
+    - rpipico
+

libraries/DHT20/examples/DHT20_test_rp2040/DHT20_test_rp2040.ino

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+//
+//    FILE: DHT20_test_rp2040.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
+//
+
+//  Always check datasheet - front view
+//
+//          +--------------+
+//  VDD ----| 1            |
+//  SDA ----| 2    DHT20   |
+//  GND ----| 3            |
+//  SCL ----| 4            |
+//          +--------------+
+
+
+#include "DHT20.h"
+
+DHT20 DHT(&Wire);  //  or use 2nd I2C interface &Wire1
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("DHT20 LIBRARY VERSION: ");
+  Serial.println(DHT20_LIB_VERSION);
+  Serial.println();
+
+  Wire1.setSDA(12);  //  select your pin numbers here
+  Wire1.setSCL(13);  //  select your pin numbers here
+  Wire1.begin();
+
+  delay(2000);
+
+  Serial.println("Type,\tStatus,\tHumidity (%),\tTemperature (C)");
+}
+
+
+void loop()
+{
+  //  READ DATA
+  Serial.print("DHT20, \t");
+  int status = DHT.read();
+  switch (status)
+  {
+  case DHT20_OK:
+    Serial.print("OK,\t");
+    break;
+  case DHT20_ERROR_CHECKSUM:
+    Serial.print("Checksum error,\t");
+    break;
+  case DHT20_ERROR_CONNECT:
+    Serial.print("Connect error,\t");
+    break;
+  case DHT20_MISSING_BYTES:
+    Serial.print("Missing bytes,\t");
+    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,\t");
+    break;
+  }
+
+  //  DISPLAY DATA, sensor has only one decimal.
+  Serial.print(DHT.getHumidity(), 1);
+  Serial.print(",\t");
+  Serial.println(DHT.getTemperature(), 1);
+
+  delay(2000);
+}
+
+
+//  -- END OF FILE --