How many times the enviromental light isn't enough to draw a line or to make a drawing and you can't see very clear? I had the same problem so when i bought these two identical rulers from a Lidl store i knew what exactly to do with them. The good thing is that these kind of rulers are handy because they have a holder which is empty and i decided to fit inside 2 white Leds, a button, 2 cables and 2 button cells. Also you may need some hot glue or any other glue, some tape, a soldering tool and some available time. No skills are required for this very simple but also useful project. >2 white LEDS 2,2V ~0,20 euro both >a button switch ~ 0,10 euro > 2 Button cells of 1,5V each ~ 1 euro the pair > 2 cables 2x 20cm > a cable stripper/Cutter > Soldering
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step 1Prep the LEDs and the circuit
Take the 2 wires and cut them both in the middle. Strip them and sold each end of the Led to the appropriate cable. Choose significant colors like red and black (or white i…
step 2Finishing the Project
Put a lot of hot glue in the button switch area so it must be tight enough and no room for short circuit or contact with humidity. Also Fit the two leds in the edges of the…
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http://www.instructables.com/id/Make-a-LED-lighted-Handy-Ruler/