diff --git a/openConfigFile.m b/openConfigFile.m
new file mode 100644
index 0000000..1b4b056
--- /dev/null
+++ b/openConfigFile.m
@@ -0,0 +1,24 @@
+function dataDir = openConfigFile(configFile, logFileID)
+%OPENCONFIGFILE open file config.txt and read dataDir
+%   Config file must follow specific/restrictive rules
+% Author: AT
+% Date: 2019-01-15
+% TODO: Less restrict rules for writting confix.txt
+
+if ~exist(configFile, 'file')
+    error([configFile, ' required']);
+end
+fileID = fopen(configFile,'r');
+dataDir = fscanf(fileID, '%s'); % Read config file without spaces
+fclose(fileID);
+k = strfind(dataDir, 'dataDir='); % Find definition of dataDir
+k = k + 8; % Remove 'dataDir='
+dataDir = dataDir(k:end); % Assume that config file ends with dataDir content
+% Check if dataDir exists
+if ~exist(dataDir, 'dir')
+    fprintf(logFileID, ['Data directory not found, check ' configFile]);
+    error(['Data directory not found, check ' configFile]);
+end
+
+end
+