Talking to Craig in FabLab about my LED circuit, he showed me this website. Which calculates my resistor from the volts of the LED's and Battery. With this I set up a quick breadboard circuit, to see if it works and then I soldered them all together. I have done them with additional wires so I can position them comfortably into the object. As I have a bit of room in the object I can do this easily.
Since the regular 9V battery doesn't fit into my object anymore, Craig recommended an alkaline 12V battery, which will fit nicely at one of the ends, preferably the end with out the switch.
My circuit consists of 6 blue LED's, 2 resistors, a 12V battery and a momentary switch. A momentary switch is a switch that only lights up the LED's when pushed down. When you release the LED's will turn of again. At the moment the wiring at the switch is a bit loose and the connection to the battery gets loose at times as well.
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