diff --git a/lib/I2CDeviceLib/I2CDeviceLib.ino b/lib/I2CDeviceLib/I2CDeviceLib.ino
new file mode 100644
index 0000000..d979c2e
--- /dev/null
+++ b/lib/I2CDeviceLib/I2CDeviceLib.ino
@@ -0,0 +1,55 @@
+/*
+ * Anatole SCHRAMM-HENRY
+ * Tim THUREL
+ * Température groupe 3
+ * 
+ * Test de la bibliothèque permettant de piloter le STS21
+ * Capteur de température de la marque SENSIRION
+ * Précision : 0.2°C
+ */
+
+#include "STS21.h"
+
+STS21 sts21;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println("Starting sts21 test");
+  if(sts21.begin())
+    Serial.println("Sensor present !");
+  else
+    Serial.println("Sensor missing !");
+  Serial.println("End setup");
+  sts21.reset();
+  Serial.println("Setting chip heater");
+  sts21.enableOnChipHeater(true);
+  delay(100);
+  Serial.println("Setting chip heater");
+  sts21.enableOnChipHeater(false);
+  delay(100);
+  Serial.println("Setting resolution 12");
+  sts21.setResolution(STS21::RES_12);
+  delay(100);
+  Serial.println("Setting resolution 14");
+  sts21.setResolution(STS21::RES_14);
+  delay(100);
+  Serial.println("Setting resolution 13");
+  sts21.setResolution(STS21::RES_13);
+  delay(100);
+  Serial.println("Setting resolution 11");
+  sts21.setResolution(STS21::RES_11);
+  delay(100);
+  sts21.setResolution(STS21::RES_14);
+  delay(100);
+}
+
+void loop()
+{
+  double temp = sts21.getTemperature();
+  Serial.printf("No Hold -> temp : %.2f\n",temp);
+  temp = sts21.getTemperature(false);
+  Serial.printf("Hold -> temp : %.2f, Battery level low : %s\n",temp, sts21.lowBattery() ? "true":"false");
+
+  delay(1000);
+}