----- Original Message -----=20
From: "Sarin Sukumar A" <sarinsukumar@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, October 21, 2010 6:03 AM
Subject: Re: [EE] Storage for 40mJ


>I am harvesting energy while walking. i am able to generate 3mJ (m stands
> for milli) per 10 steps.
> so in 200 steps i can generate 60mJ. i need to store this energy. If i am
> using an ordinary battery of 50mAh and 1.2V battery, 60mJ wont give me
> enough voltage for power an LED.

So what **voltage** are you generating (at 3mJ) ?

Whatever energy you're generating may be useless if you don't actually have=
=20
enough voltage to actually power your LED.

For example, you could generate 30mV all day long and feed it into a batter=
y=20
or capacitor but at the end of the day the potential at the storage mediums=
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terminals will still only be 30mV

If you are generating a low voltage you'll need some form of step up=20
circuitry to boost this low voltage to something an LED can use.

You're really not giving us enough information to help you with your=20
requests.

Dom=20

--=20
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