Adding A Netbook Keyboard Light

[Vikash] was having trouble using his netbook in the dark so he added a keyboard light. He’s got a Dell Vostro A90 which is the same hardware as the popular Dell Mini 9. We agree that the condensed keyboard layout makes it hard to type without looking; just try to find the quotation mark, brackets, and tilde keys! He added an LED to the bezel around the LCD screen in order to shed light on the situation. Now the LED can be turned on using CTRL. An ATtiny13 microcontroller monitors pins 1 and 11 of the keyboard, waiting for the CTRL keypress, then turns on the light when it receives it. This hardware solution means it doesn’t matter if you’re running a Hackintosh (like he is), Ubuntu (like we are), or that other OS.

33 thoughts on “Adding A Netbook Keyboard Light

  1. *Great* idea, and one that should be included in the roster of built ins for a device like this but I’d side with some of the other posters. I have a Mini 9 and there’s the usual Dell blue function keys, so I’d prefer {Fn} + {something little-used}, but that’s just a matter of preference. This mod was probably doable while not having to reverse engineer things for weeks. I’ve just been using a USB powered light myself but may reconsidered.

  2. I’d had a similar situation and while it wasn’t a true “hack” it was a convenient mod. I used one of those folding booklights my wife got with a snuggie and mounted the folding hinge into the top housing and a resisted line soldered to the battery connectors hidden inside the case. It only turns on when you release the hinge and it releases itself from behind the display to point directly at the keys!

  3. @ most above agreed. With my wife’s old HP I got a dollar tree usb swivel lamp that i just rigged internally with the switch in the extra space by the cooling fan (wtf is that space for anyway?). Her new old thinkpad has one built in and it’s quite pimp.

  4. Gotta love the first comment on the Dell forums link.

    “nice job, looks good, seems like a lot of work though…I think a small attachable book light would also do the same job….but yours is nice too..”

  5. The human eye is most sensitive to green but red won’t cause your pupils to contract.

    Blue causes hazing and makes your night vision worse. It should not be used for night lights.

  6. Thanks for the comments, everyone.

    On ThinkPads, the ThinkLight is toggled by pressing Fn-PgUp which is nice because Fn is the lowest/leftmost key and PgUp is the highest/rightmost key, so you can feel for it in the dark. On the Mini 9, the corresponding key combo would be Ctrl-Backspace, but I didn’t want to use a keystroke that would be so likely to be bound to some action in software. As a bonus, the Ctrl key is easy to monitor.

    tristand – I read and was inspired by your writeup — nice work, by the way — but I couldn’t seem to access the system management bus from OS X. This way I do get the advantage that it works independently of the OS; it even works during bootup or in the BIOS configuration.

    qwertyphile – I suppose you could accomplish something similar with a handful of components (you’d need a little more than just a flip-flop and capacitor — probably at least resistor and an AND gate), but the ATTiny13 is only a buck and a half and really compact.

    Anon – I in fact have three ThinkPad X series laptops. That’s why I couldn’t deal with not having a ThinkLight on this Dell.

  7. From the link : “I also dimmed the power LED a little with some masking tape”… wtf ? he can open his notebook, program a microcontroller to do what he wants, but he can’t even dim the LED with PWM ?

  8. Olivier – That’s a thought — I was going to just try putting a resistor in series with it, but the power LED is a super-tiny SMD unit with a light pipe that fits on top. It’d be hard to keep it in the same position but run new wires without interfering with the light pipe fit. The motherboard also drives the LED with PWM (it fades in and out when the computer’s asleep) so it might be hard to sync the two PWM signals up to maintain that feature. In the end, masking tape worked perfectly.

  9. @Vikash : I don’t really understand where this other PWM is coming. From your schematics, the LED is connected to +5V and the ATTiny.
    So, I also don’t understand why you would need new wires ? It should work by just changing a bit your program, no?

    I’m sorry if I’m missing some informations, but I can’t see any pics because I’m not registered to the mydellmini forum.

  10. Olivier – Oh, I see where the confusion is coming from. The LED that I dimmed with masking tape is the netbook’s built-in power LED, completely different from the new LED that I installed. That masking tape is a separate mod on a separate part of the computer.

  11. @Vikash : ok, thanks for the explanation, now I understand :) I didn’t understand that the “power LED” was the LED of the notebook.
    I thought you were meaning that the LED you installed was too powerful to be usable. As I said, the only pic I’ve seen of your mod is the little one from here.

    So, I’m very sorry, and congrats for your work :)

  12. Thanks Vikash for taking the time to upload the pics somewhere else. Now we can really appreciate your work.
    Now I should do the same kind of modification on my good old eeepc 701 :)

  13. For all of you guys talkin about this or that has been seen/done before, keep in mind some of us, including newbies like myself, have NEVER seen this before. It’s a brand new thought for us.

    So if you seen it before,good for your lucky ass. Move on to your next mind changing idea that will revolutionize the world. Why spend the precious seconds telling us how you seen/done it before?

  14. I was also dubious about the new key styles. I have had the more Selectric style keyboards for quite a while–both wireless and wired. I love them. I got one of the new wireless ones, and then this one. As I have gotten used to them, I really like them. I am not a touch typist, but more a multi-finger-hunt-and-peck typist. On the new ones, I am back up to 50wpm. Here is my gripe. The previous generation wireless keyboard was available with a full separate numeric keypad, arrow keypad, and specific keys and SIXTEEN function keys. Why, oh why Apple, is the new wireless version only available in a QWERTY layout with no numeric keypad?

    Colonel Panic

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