Software.md

@@ -85,7 +85,27 @@ float voltage = HDU_BATSENSE_read();
 
 ## Bluetooth debugging (HDU_BLUETOOTH.h)
 
-This module simplifies the usage of a HC-05 / HC-06 bluetooth module. Currently is is only possible to send messages in blocking mode, as the Rx pin of the used UART1 is shared to the camera interface.
+This module simplifies the usage of a HC-05 / HC-06 bluetooth module. Currently is is only possible to send messages in blocking mode, as the Rx pin of the used UART1 is shared to the clock of the camera interface.
+
+### Module documentation
+
+#### void HDU_BLUETOOTH_init(uint32_t baudrate)
+Initializes the HDU_BLUETOOTH module using Tx of UART1. A Baudrate up to 115200 kBAUD can be selected. 
+This function may only be called once.
+
+#### void HDU_BLUETOOTH_sendMessage(char *message)
+sends a string with a maximum length of 40 chars over bluetooth uart.
+
+#### void HDU_BLUETOOTH_sendDebugMesssage(char *message, float value, char *unit)
+can be used to debug a variable in the format "message: value unit\n".
+
+### Example 
+Debug a variable:
+<code>
+HDU_BLUETOOTH_init(9600); //9600 BAUD for standard terminal programs
+float vbat = 7,9;
+HDU_BLUETOOTH_sendDebugMessage("VBAT", vbat, "V");
+</code>
 ## HMI interaction (HDU_HMI.h)
 
 ## Camera reading (HDU_LINESCAN.h)