Stamp Power Saver: Circuit to turn on Stamps power only when needed

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Because I wanted to save power on my battery powered projects, I developed an electronic system that turns on my Javelins power only when needed. This is accomplished by making the electronics on the project board send an Attention pulse to the Power Save Circuit, which in turn switches the power to the Stamp On. The Stamp then is given control over the Power Saver Circuit, so that power is On until the Stamp tells the Power Saver Circuit to turn it off.

This circuit is meant to be used when you only need the Stamp some of the time, and your external electronics takes care of the rest of the functions of your project when the Stamp is turned off.
In my project I have a radio receiver that sends a pulse to the Atn when a signal is present, the Stamp then turns on to receive data over the radio line.

I have tested the circuit and it is working.

The circuit only consists of six components:
- Logic OR gate in SOT23-5 packaging
- OptoMos relay in DIL4 packaging
- Resistor, 500 Ohm 1/4W
- Voltage regulator, +5V 150mA in SOT23-5 packaging (with two external capacitors as specified by data sheet)

You will have to have an additional +5V voltage regulator supplying the OR gate with current.


Code for the Javelin Stamp:

public static void main(){

    static boolean turnOff=false;
    static boolean powerLoop=true;

    CPU.writePin(P0, true);
    
    while (powerLoop==true){
        if (turnOff==true){
            CPU.writePin(P0, false);
        } // END if

    } // END while

} // END main

Circuit diagram with description is attached.
PCB layout example is attatched.

PCB layout of my final project incorporating this circuit is attatched.

Post Edited (search) : 2/3/2008 8:40:05 PM GMT

sam_sam_sam

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Very nice project and very and nicely lay out board

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··Thanks for any··that you may have and all of your time finding them

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Sam