My solution to Auto Power ON Lilliput screen

**skippy76** · 04-05-2004, 12:38 PM

Looks good, and I agree with Coyote's values... all I have to do now is buy a Lilliput.

**[iG]** · 04-05-2004, 12:56 PM

*adds thread to the "to do list"*

thanks coyote

**MatrixPC** · 04-06-2004, 10:43 AM

Originally Posted by coyote

Yes but the problem is that 100uF begin to be a big capacitive load and can generate disturbances to other parts of the circuit and is dangerous for the lifetime of the power button . I think that 10uF is the limit.

Moreover, the 150K resistor is also the limit to pull up the uC input to 5V with a good stability.

They are the reasons of my choice of values.

Cool man, some thing to learn more everyday.

**Batmanatthenewb** · 04-06-2004, 10:22 PM

Nice mod coyote. I don't currently shut mine down. When I hibernate the pc screen goes blank and i get out of car. Haven't had any trouble with battery running down, but this would help eliminate the chance of battery run down

Batman

**Laidback** · 04-10-2004, 12:32 PM

Good work Coyote!! Does the job!

**bertybassett** · 04-10-2004, 01:01 PM

@Batmanatthenewb auto power up but not automatic power down.

**Laidback** · 04-10-2004, 01:52 PM

Originally Posted by bertybassett

@Batmanatthenewb auto power up but not automatic power down.

It is if you run it from the PSU!

**c0rrupti0n** · 04-11-2004, 10:27 PM

Hey guys, I recently added this mod to my lilliput. However it didnt seem to have an effect of any kind. I still have to click on On button to power the lilliput. I noticed that my circut board is just a tad different from yours. But the chip layout on the board is the same. I'm no electrician, but I everything seems to be in proper place. Theres just a few questions I have. For both capacitor and resistor, does it matter what end is connected? Meaning is there a positive end and negative on either capsitor or resistor? Like a batter has a positive side and a negative. I will post pictures of my solder job when available... Meantime please help. Id like to get this sweet mod working... Thanks in advance...

**gospeed.racer** · 04-11-2004, 10:30 PM

Originally Posted by c0rrupti0n

For both capacitor and resistor, does it matter what end is connected? Meaning is there a positive end and negative on either capsitor or resistor?

Capacitors DEFINATELY (can, I know i will get flamed if I say "all"!) have polarity..and according to Coyote's pic, he says "be careful with polarity"...thats what he means! However, with resistors, theres no polarity to worry about.

**c0rrupti0n** · 04-11-2004, 10:37 PM

I just noticed something... I think i might of purchased the wrong resistor... I purchased a 150-ohm, 1/2 watt, 5% tolerance package of resistors at Radio Shack. I seem to be missing the K. Could i be right? Is there a 150 ohm resistor and a 150k resistor?