+extern void Sensor_Init(); // One off initialisation of *all* sensors
+
+extern void Sensor_StartAll(const char * experiment_name); // Start all Sensors recording data
+extern void Sensor_StopAll(); // Stop all Sensors recording data
+extern void Sensor_Start(Sensor * s, const char * experiment_name); // Start a sensor recording datas
+extern void Sensor_Stop(Sensor * s); // Stop a Sensor from recording data
+