diff --git a/htu21d.h b/htu21d.h
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--- /dev/null
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+
+//LEONARDO ESTUVO AQUÍ 1 DE OCTUBRE DE 2026
+//
+//HTU21D Temperature and humidity sensor library
+//Tested in a Raspberry Pi Zero
+
+#ifndef HTU21D_H
+#define HTU21D_H
+
+//Commands and i2c address
+#define ADDR 0x40 //i2c address
+#define HUM 0xE5
+#define TEM 0xE3
+#define RESET 0xFE
+
+
+
+
+int getTemp(int fd, double *temp);
+int getHum(int fd, double *hum);
+
+
+
+#endif //HTU21D_H