+/** Number of data points to keep in sensor buffers **/
+#define SENSOR_DATABUFSIZ 10
+
+#define SENSOR_QUERYBUFSIZ 10
+
+/** Number of sensors **/
+#define NUMSENSORS 1
+
+/** Structure to represent data recorded by a sensor at an instant in time **/
+typedef struct
+{
+ /** Time at which data was taken **/
+ float time;
+ /** Value of data **/
+ float value;
+} DataPoint;
+
+/** Structure to represent a sensor **/
+typedef struct
+{
+ /** ID number of the sensor **/
+ enum {SENSOR_TEST0=0, SENSOR_TEST1=1, SENSOR_NONE} id;
+ /** Buffer to store data from the sensor **/
+ DataPoint buffer[SENSOR_DATABUFSIZ];
+ /** Index of last point written in the data buffer **/
+ int write_index;
+ /** Offset position in binary file for query thread to read from**/
+ int read_offset;
+ /** Binary file to write data into when buffer is full **/
+ FILE * file;
+ /** Thread running the sensor **/
+ pthread_t thread;
+ /** Mutex to protect access to stuff **/
+ pthread_mutex_t mutex;
+
+
+} Sensor;
+
+/** Array of Sensors **/
+extern Sensor g_sensors[];
+
+extern void Sensor_Init(Sensor * s, int id); // Initialise sensor
+extern void * Sensor_Main(void * args); // main loop for sensor thread; pass a Sensor* cast to void*
+
+extern int Sensor_Query(Sensor * s, DataPoint * buffer, int bufsiz); // fill buffer with sensor data
+
+extern void Sensor_Handler(FCGIContext *context, char * params);