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arduino-cli/libraries/Adafruit_HTU21DF/examples/HTU21DFtest/HTU21DFtest.ino

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+/***************************************************
+  This is an example for the HTU21D-F Humidity & Temp Sensor
+
+  Designed specifically to work with the HTU21D-F sensor from Adafruit
+  ----> https://www.adafruit.com/products/1899
+
+  These displays use I2C to communicate, 2 pins are required to
+  interface
+ ****************************************************/
+
+#include <Wire.h>
+#include "Adafruit_HTU21DF.h"
+
+// Connect Vin to 3-5VDC
+// Connect GND to ground
+// Connect SCL to I2C clock pin (A5 on UNO)
+// Connect SDA to I2C data pin (A4 on UNO)
+
+Adafruit_HTU21DF htu = Adafruit_HTU21DF();
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("HTU21D-F test");
+
+  if (!htu.begin()) {
+    Serial.println("Couldn't find sensor!");
+    while (1);
+  }
+}
+
+void loop() {
+    float temp = htu.readTemperature();
+    float rel_hum = htu.readHumidity();
+    Serial.print("Temp: "); Serial.print(temp); Serial.print(" C");
+    Serial.print("\t\t");
+    Serial.print("Humidity: "); Serial.print(rel_hum); Serial.println(" \%");
+    delay(500);
+}