I had some free minutes that i spent to go on with the scope electric. At the end, i found out that the LED i used is not bright enough :-(5mm, cristal clear). The reason for this is the current the battery has. It is operating on 3.7Volts but the LED has a range from 4-6Volts. Thought that it would be bright enough, but it is not.   But check on your own...     As everytime, thanks for reading and commenting! :-)    
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