Re: [Tinyos-help] Battery Power measurement

Jacob Sorber Mon, 09 Oct 2006 10:40:57 -0700

A word of caution. If you are using battery voltage to estimate residual energy, make sure you look at the discharge curve for your particular battery. It will not be linear, and it will depend on how much current you are drawing. For example, using a GPS receiver that draws 40-80mA is going to cause your voltage to dip a little. Also, if the batteries are being recharged, the entire curve will be shifted up--the amount of current is flowing into the battery will determine how much it shifts. Typically if you need really accurate estimates, voltage is probably not the measure you want. Rather, you should look at using some kind of fuel guage IC ( e.g. the DS2770 or DS2751 from Maxim/Dallas) which if used properly can give you a much more accurate measure of how much energy you are consuming. If you just need a ballpark estimate, then use voltage and then use a model of your battery to map the voltage reading to residual energy.

Good luck,

Jacob Sorber

On 10/9/06, Munaretto, Daniel <[EMAIL PROTECTED] > wrote:

Dear Wu,
    i'm interesting in the same question. I checked Voltage.nc and VoltageM.nc.
How can i get the voltage value from async event result_t ADC.dataReady(data), specified in VoltageM.nc,  to my main program (BcastM.nc)?

        -----Original Message-----
        From: Wu Nick [mailto: [EMAIL PROTECTED]]
        Sent: Sat 10/7/2006 4:46 PM
        To: [EMAIL PROTECTED]; [email protected]
        Cc:
        Subject: RE: [Tinyos-help] Battery Power measurement

        Check the component "Voltage.nc" , then call ADCbatt.dataReady(uint16_t)
        to get the ADC_Count. Also see  Crossbow, MPR-MIB Users Manual (page 25)
        for detail.

        Best regards,
        Wu

        >From: "Sumit Gupta" <[EMAIL PROTECTED]>
        >To: [email protected]
        >Subject: [Tinyos-help] Battery Power measurement
        >Date: Fri, 6 Oct 2006 18:47:53 -0500
        >
        >hi,
        >
        >I am wondering how we can measure the remaining nodes' battery power
        >and
        >store them at base stations. I am using telosb motes. Please advice.
        >
        >Regards,
        >Sumit

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Re: [Tinyos-help] Battery Power measurement

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