My solution to Auto Power ON Lilliput screen

**coyote** · 03-30-2004, 03:23 PM

For those who want that their Lilliput screen power ON automatically when the power supply is applied on :

Coyote

**hevnsnt** · 03-30-2004, 04:30 PM

Nice Thanks!

**el bob** · 03-30-2004, 05:09 PM

Has anyone else tried this and confirmed that it works?

**Laidback** · 03-30-2004, 05:14 PM

Originally Posted by el bob

Has anyone else tried this and confirmed that it works?

You think El Coyote is lying??

**coyote** · 03-30-2004, 08:36 PM

Originally Posted by el bob

Has anyone else tried this and confirmed that it works?

Yes, me

**jusatry** · 03-31-2004, 02:41 AM

will the poweron/power off by button still work with this setup? thanks!

**coyote** · 03-31-2004, 05:30 AM

Yes, every things still working after this modification, you can switch OFF the screen, switch ON, ... the only différence is that the screen always switch ON automatically when you put the power supply ON.

**Enforcer** · 03-31-2004, 09:32 AM

noted.

**rando** · 03-31-2004, 10:15 AM

My Lilliput isn't here yet, but I was already thinking of how to solve this problem with a micro relay. I like your circuit better though!

If I understand it right, the common node between the resistor and capacitor is briefly pulled down to ground when the power is first applied. Once the capacitor charges, the point is pulled up to 5v through the resistor.

One thing confuses me though, what is the point on the other side of the resistor that was removed? Isn't it also 5v? If so, wouldn't it be possible to build your circuit without removing the surface mount resistor? I'm probably confused. Feel free to slap me.

**rando** · 03-31-2004, 10:18 AM

Also, how long does it take that cap to discharge once the power is removed? Supposed the power is removed and restored very quickly (perhaps during cranking). Does the LCD come back on?