This question might have been asked previosuly and i had searched a lot on Google.But i think i can get a more satisfactory nswer over here.
I am building my own Arduino based board using Atmega348 and want to use it for a low power based product.What i read about arduino that due to use of LM7805, i consumes a lot of power even in ideal conditons and if we want a battery back up of some what about 6 months with some components attached to it like 3 sensors, A GPRS/GSM module and a LCD, it’s not possible with 6AA batteries with 1500mAh current.Device will be in power down mode and wake up after every 20 minutes and do some reading, send data and then again go to sleep.We may even use internal oscillator to reduce the power consumption.
So what i though why not remove this 7805 and have some voltage regulator that power up 3.3 v to 5v.I came across ceratin links in net like this
Is that a right approach or what i am thinking of getting a 6 month back-up is not possible.I also went through these links but didn’t get any workable answer
so i will be greatfull if some one can enlighten me more on this.