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Super low power LCD clock
posted February 6 2011 21:30.42 by Giorgos Lazaridis

Kenneth ran some experiments with the MSP430 microcontroller chip and an LCD. What he did, is he used 2 10F super capacitors charged at 2.7 volts for power supply, and used this chip to drive an LCD display 24/7, counting from 0 to 9. After 3 weeks (yes, 3 weeks) the chip was still counting and there was some 0.15V left on the capacitors down to the rated minimum voltage. The next step, was to make a clock with this. This time he used a single 3V coin cell (CR2032) for power. And because raw LCDs needs of a specific voltage curve to operate, he got himself an ICM7211 LCD driver. The overall power consumption is as low as 12uA. Considering the fact that the coin cell can supply 200mAh, the theoretical lifespan of this battery is more than two and a half years. Not bad eh? Excellent work!

This is a video from the first experiment:

Tags: electronic project   clock   low power   microcontroller   msp   battery   experiments   green
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 At 7 February 2011, 6:05:51 user Adam wrote:   [reply @ Adam]Because they're 2.7v. What voltage are your 470uF caps rated for?At 7 February 2011, 5:57:02 user Kammenos wrote:   [reply @ Kammenos]They are super capacitors, high capacitance low voltage. These ones can handle up to 2.7 volts. Your capacitor could handle some 25,50 or more voltage.At 6 February 2011, 22:45:01 user herctrap wrote:   [reply @ herctrap]those 10F are smaller than my 470uF caps why?