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Reducing power consumption in micro SD card.


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I am using micro SD card to log reading from four force sensors connected to the microcontroller (MSP430G2553). Controller logs reading to the SD card every 15 minutes and goes to sleep. I am using 1000 mAh battery, which is lasting over a week. Is it possible to reduce the power consumption as to make it last over a month.

(#) Even if the microcontroller is sleeping for 15 minute, SD card is continuously consuming power.

(#) It takes couple of mA to write.

  • Help with any suggestion to reduce to power consumption drastically. Schematic and code (attached).

Datalogger_Schematic.JPG

Code_Datalogger_msp430g2553.txt

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First off, welcome to the forum.

A couple of ideas come to mind.  The first is that you might want to consider controlling the power to the SD card with a free I/O line and a transistor, only powering it up when you need to write to it.  The other idea is to store multiple samples in an array (which should survive going into low power mode and back) and write them to the SD card every hour or more. How many samples to store between writes to the SD card would depend on your confidence that you wouldn't lose power or have a reset condition before having a chance to move them to the card.

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