Thread: Remotely startup laptop...? (wake on lan)??

I've never seen a laptop start on IR before, or even wake on it. The remote contorl is cool, but was probably designed for that purpose in mind. Lucky you :-). I'll test my top wiht a PPC. I was thinking of doing that and expanding it with an auto start off a PPC. start the car, walk over, everythins' up when i open the door, dock the PPC, transfer my notes from class.

The screen open thing uses a photocell, alteast it does on mine, but mine is a very special laptop (IBM transnote). The easiest way to do it is not to run a switch from the laptop, but run an small, thin LED to the laptop. I may do that with mine if the packet idea doesn't work.

my top standby's for 4 days. Why don't you have a switch from your inverter or power cable to it doesn't drain the battery of the car, but the battery of the top? The worse that can happen is that it hibernates.

Is there any cheap component for sale that can do constant to momentary? I just need to find a way to trigger my laptop when the car is on. I already soldered wires out of the power buttons.

I tried to build a circuit like this one



but it just doesn't work consistently at al. After a while, it just stops working so I have to use my relocated button again. Kind of a pain.

Relay Toggle Circuit Using a 556 Timer
This toggle circuit operates by using a couple 555 timers wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first timer and pin 5 is the output. The output at pin 5 will always be the inverse of the input at pins 2 and 6. Likewise, the output at pin 9 of the second timer will always be the inverse of the input at pins 8 and 12. A 100K resistor connects the output of one inverter to the input of the other so the state of one will be the opposite of the other.
In operation, the 1uF capacitor will charge to whatever voltage is present at the output on pin 5. When the button is pressed, the capacitor voltage will be applied to the input of the other timer which will reverse the state of both timers and toggle the relay, either on or off.

To follow it more closely, assume the output at pin 5 is +12 volts and the second output at pin 9 is zero volts. The 1uF cap will be charged to 12 volts. When the button is pressed, the cap will apply +12 to the inputs at pin 2 and 6 which will cause the output at pin 9 to go to zero, turning off the relay. When the button is released, the cap will discharge to zero, since the voltage at pin 5 is now zero. When the button is again pressed, the capacitor will apply zero to pins 2 and 6 causing the output at pin 9 to switch positive and engage the relay, and the cycle repeats.

The advantage of this circuit is the large hystersis range on the inputs. The button can be held closed indefinetly without upsetting the state of the outputs since the input voltage will be 1/2 the supply due to the equal value 100K resistors. The switching points are 1/3 and 2/3 of the supply so that a voltage of 50% has no effect. The circuit will also toggle very fast and needs no switch debouncing. One disadvantage is that it may turn on with the relay either engaged or disengaged. To solve that problem, you could use a resistor in series with one of the reset lines (4 or 10) and add a capacitor from the reset line to ground.

The 100 ohm resistor and 100uF capacitor serve to filter noise on the supply line if the circuit is used in a automotive application. They may not be necessary. The circuit may work well without those parts.



Sorry for the long post but i got it from a website.

I’m not an electrical engineer but this sound like it would help us, I too use a laptop in my car and I’m also looking for a solution for this..

What do you guys think?

..wha?

Hehe, not an EE either, i need a translator!