Stuck with a dull old 90's keyboard? Want a cool blue backlit keyboard on the cheap? Say no more...I'll show you how to upgrade your sleep-inducing boring old keyboard into the next century.
Step 1: Tools and Materials You'll Need:
- 1 dull keyboard
- 3...6 high brightness LEDs (I used blue, but you can use any color you want, or even mix)
- current limiting resistors (depends on keyboard voltage and LEDs, see further)
- wire, not to thick.
- soldering iron
- glue gun
- small drill
- sharp knife
...you know, the usual stuff.
Step 2: Disecting Your Keyboard
Remove the bottom part with the electronics and put it asside for now. On most of these old keyboards the top part will just hold the keys themselves.
Step 3: Decide Where to Put the LEDs
- make sure there is enough room for the LEDs to fit. I didn't at first and had to use an electric paint stripper to soften up the plastic to get the LED in position.
- it might be a better idea to use 3mm instead of 5mm LEDs, a I did.
- try to pick some spots where LEDs shine inbetween the rows of the keys, so the light gets spread under them.
- keep in mind each LED will also get one resistor, so you'll need room for that too.
Once your happy with the spots:
- remove the keys on the top near the LEDs choosen position
- mark the spots
- start drilling, using a drill slightly bigger than the LED . Give the LEDs some room so you can point them in the right direction, we'll fix em later with the hot glue gun.
Step 4: Mount the LEDs
Now, on the bottom side of the keyboard (with the controller) locate GND and VCC near the connector where the cable gets in. Use a voltmeter for this. I found 4.5V supply voltage. No idea if this is a "standard" keyboard voltage.
Then calculate the current limiting resistors you need, using ohms law. I choose 15mA for the LED current. The blue LEDs from my junkbox had a drop of 4V@15mA (must be really crappy ones).
Solder a resistor to each LED.
Solder wires to the LEDs ( white=VCc, green=GND in the pictures)
Do a dry test with a battery or power supply.
Happy? Position the LEDs in such a way as that they shine in between the rows of keys.Get medieval with the glue gun and fix their position.
Step 5: Key Cutouts:
Step 6: Route and Solder the Wire
Make sure your wire uses a path that doesn't interfere with the keys functioning.
You might have to cut away some plastic on the inside here and there, to get your wires through.
Then solder the wires to the power points (observe polarity).
With the keyboard open and connected to your computer, do another dry test.
Step 7: Close It Up and Enjoy.
turn over and hookup.Pray everything still works and switch on.
Enjoy your newly pimped ultra-cool backlit keyboard!
Step 8: Some Ideas and Hints
You might want to experiment using different colors. For example blue on the left side and yellow on the right to make a nice gradient.
I recently added some more LEDs, in the top row, however the "backlit" effect works better if the LEDs are inbetween rows, like the ones on the left and right.