use "arduino-sht" library for sht3x and sht4x

src/library/arduino-sht/examples/multiple-sht-sensors/multiple-sht-sensors.ino

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+#include <Wire.h>
+#include "SHTSensor.h"
+
+// Note that all i2c devices sharing one bus must have distinct addresses. Thus
+// this example only works with sensors that have distinct i2c addresses (e.g.
+// SHT3x and SHT3x_alt, or SHT3x and SHTC3).
+// Make sure not to use auto-detection as it will only pick up one sensor.
+
+// Sensor with normal i2c address
+// Sensor 1 with address pin pulled to GND
+SHTSensor sht1(SHTSensor::SHT3X);
+
+// Sensor with alternative i2c address
+// Sensor 2 with address pin pulled to Vdd
+SHTSensor sht2(SHTSensor::SHT3X_ALT);
+
+void setup() {
+  // put your setup code here, to run once:
+  Wire.begin();
+  Serial.begin(9600);
+  delay(1000); // let serial console settle
+
+  // init on a specific sensor type (i.e. without auto detecting),
+  // does not check if the sensor is responding and will thus always succeed.
+
+  // initialize sensor with normal i2c-address
+  sht1.init();
+
+  // initialize sensor with alternative i2c-address
+  sht2.init();
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  // read from first sensor
+  if (sht1.readSample()) {
+    Serial.print("SHT1 :\n");
+    Serial.print("  RH: ");
+    Serial.print(sht1.getHumidity(), 2);
+    Serial.print("\n");
+    Serial.print("  T:  ");
+    Serial.print(sht1.getTemperature(), 2);
+    Serial.print("\n");
+  } else {
+    Serial.print("Sensor 1: Error in readSample()\n");
+  }
+
+  // read from second sensor
+  if (sht2.readSample()) {
+    Serial.print("SHT2:\n");
+    Serial.print("  RH: ");
+    Serial.print(sht2.getHumidity(), 2);
+    Serial.print("\n");
+    Serial.print("  T:  ");
+    Serial.print(sht2.getTemperature(), 2);
+    Serial.print("\n");
+  } else {
+    Serial.print("Sensor 2: Error in readSample()\n");
+  }
+
+  delay(1000);
+}

src/library/arduino-sht/examples/sht-autodetect/sht-autodetect.ino

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+#include <Wire.h>
+
+#include "SHTSensor.h"
+
+SHTSensor sht;
+// To use a specific sensor instead of probing the bus use this command:
+// SHTSensor sht(SHTSensor::SHT3X);
+
+void setup() {
+  // put your setup code here, to run once:
+
+  Wire.begin();
+  Serial.begin(9600);
+  delay(1000); // let serial console settle
+
+  if (sht.init()) {
+      Serial.print("init(): success\n");
+  } else {
+      Serial.print("init(): failed\n");
+  }
+  sht.setAccuracy(SHTSensor::SHT_ACCURACY_MEDIUM); // only supported by SHT3x
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+  if (sht.readSample()) {
+      Serial.print("SHT:\n");
+      Serial.print("  RH: ");
+      Serial.print(sht.getHumidity(), 2);
+      Serial.print("\n");
+      Serial.print("  T:  ");
+      Serial.print(sht.getTemperature(), 2);
+      Serial.print("\n");
+  } else {
+      Serial.print("Error in readSample()\n");
+  }
+
+  delay(1000);
+}

src/library/arduino-sht/examples/sht3xanalog/sht3xanalog.ino

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+#include <Arduino.h>
+#include <Wire.h>
+
+#include "SHTSensor.h"
+
+SHT3xAnalogSensor sht3xAnalog(A0, A1);
+
+void setup() {
+  // put your setup code here, to run once:
+
+  Wire.begin();
+  Serial.begin(9600);
+
+  delay(1000); // let serial console settle
+}
+
+void loop() {
+  Serial.print("SHT3x Analog:\n");
+  Serial.print("  RH: ");
+  Serial.print(sht3xAnalog.readHumidity(), 2);
+  Serial.print("\n");
+  Serial.print("  T:  ");
+  Serial.print(sht3xAnalog.readTemperature(), 2);
+  Serial.print("\n");
+
+  delay(1000);
+}