diff --git a/main.c b/main.c
index 961097b..5968e2e 100644
--- a/main.c
+++ b/main.c
@@ -78,6 +78,16 @@ volatile bool rtc_internal_tick_flag = false; /**< flag set when internal RTC ti
 volatile uint32_t ddm100tc_interval = 0; /**< last time interval between pulses **/
 /** @} */
 
+/** @defgroup main_database influxDB information to submit measurements
+ *  @{
+ */
+#define DATABASE_HOST "opi" /**< influxDB host (or IP) */
+#define DATABASE_PORT 8086 /**< influxDB port for HTTP API */
+#define DATABASE_USER "meter" /**< name of user with permission to write to database */
+#define DATABASE_PASSWORD "password" /**< password of user with permission to write to database */
+#define DATABASE_NAME "spark_abacus" /**< name of database where to write the measurement values to */
+/** @} */
+
 int _write(int file, char *ptr, int len)
 {
 	int i; // how much data has been sent
@@ -218,9 +228,13 @@ static bool http_post_header(char* host, uint16_t port, size_t length)
 		fprintf(stderr,"TCP connection failed\n");
 		return false;
 	}
-	if (!http_send((uint8_t*)"POST /write?db=spark_abacus HTTP/1.1\r\n", 0)) { // send data
+	if (snprintf(http_line, LENGTH(http_line), "POST /write?db=%s&u=%s&p=%s HTTP/1.1\r\n", DATABASE_NAME, DATABASE_USER, DATABASE_PASSWORD)<=0) {
+		fprintf(stderr,"could not create POST line\n");
 		return false;
 	}
+	if (!http_send((uint8_t*)http_line, 0)) {
+		fprintf(stderr,"could not send POST line\n");
+	}
 	if (snprintf(http_line, LENGTH(http_line), "Content-Length: %u\r\n", length)<0) { // set content length (for measurements)
 		fprintf(stderr,"could not create line\n");
 		return false;
@@ -614,7 +628,7 @@ void main(void)
 			data_length += snprintf(line, LENGTH(line), ddm100tc_string_power, ddm100tc_value_power); // get the size (hope no error is occurring)
 
 			// send HTTP POST request
-			if (!http_post_header("192.168.42.2", 8086, data_length)) { // send header
+			if (!http_post_header(DATABASE_HOST, DATABASE_PORT, data_length)) { // send header
 				fprintf(stderr,"could not sent HTTP POST header\n");
 			} else {
 				// send PZEM-004T values