board marker to IR-pen

This is the second type of IR-pen that I made

CAUTION: Be careful while using soldering iron and hot wax gun. Accidentally touching the hot parts may cause serious burns.

-Find a board marker (you can steal one from your teachers :) ) and disassemble it. - Ready the parts that you will use: IR-led, a 22 ohm resistor, a button, a spring and some cable. - Cut the back of the board marker and put the cable soldered spring from the back. You may prefer to not to cut the back and put the spring from the front but its a bit difficult.

-Use some hot wax to fix the back end and the spring.- Mount the button on the body of board marker. You can use the soldering iron to melt the body but it will smell bad. If you use soldering iron to melt the body, don't forget to clean the tip of soldering iron. Also solder the resistor to any leg of the IR-led. (I prefered "+")


-Solder the cable from the spring to button. Also solder a small metal string(i used the part that i cut from the IR led) to the other leg of the button.

-Insert the IR-led and the resistor trom the tip of the board marker. Leave one leg of the IR led out. Use some glue and conductor foil(I used cigarette paper but aluminium foil is more suitable) to wrap the leg that you left out.

-Re-assemble your board marker. You may also want to use some insulation tape for the make-up.