diff --git a/lib/sensor_gm1351.h b/lib/sensor_gm1351.h
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+++ b/lib/sensor_gm1351.h
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+/* This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+/** library to read measurements from GM1351 sound level meter
+ *  @file
+ *  @author King Kévin <kingkevin@cuvoodoo.info>
+ *  @date 2020
+ *  @note peripherals used: GPIO @ref sensor_gm1351_gpio, SPI @ref sensor_gm1351_spi
+ */
+
+/** measurement displayed on meter LCD */
+extern uint16_t sensor_gm1351_decidba;
+/** flag set when valid measurement has been received */
+extern volatile bool sensor_gm1351_received_flag;
+
+/** initialise interface to GM1351 sound level meter */
+void sensor_gm1351_setup(void);
+/** switch power of meter
+ *  @warning: the device will power off after 10 minutes
+ */
+void sensor_gm1351_power_toggle(void);
+