Hi guys which one is better option?
Powering up Atmega328 chip without a voltage regulator with 3 AA batteries or with the voltage regulator and a 9 volt battery. (I want it for more battery life)
All voltage regulators waste energy so not using one is usually the best.
Battery life also depends on the size of the battery.
If you are able to run the Atmega 328 at 8MHz you can save more energy and power it from 2 x AA cells (3v). Microprocessor energy consumption depends on the clock speed.
Have a look at Nick Gammon's power saving tutorial
...R
Alvin_freeman:
Hi guys which one is better option?
Powering up Atmega328 chip without a voltage regulator with 3 AA batteries or with the voltage regulator and a 9 volt battery. (I want it for more battery life)
3 AA's are way way more capacity than a PP3 9V battery. Probably an order of magnitude.
Typical rechargable AA'a are 1.8 to 2.5Ah or so, typical rechargable PP3's are 0.3Ah or so.
Robin2:
All voltage regulators waste energy so not using one is usually the best.Battery life also depends on the size of the battery.
If you are able to run the Atmega 328 at 8MHz you can save more energy and power it from 2 x AA cells (3v). Microprocessor energy consumption depends on the clock speed.
Have a look at Nick Gammon's power saving tutorial
...R
My arduino has a 3.3 volt pin so can I use it directly with 3 volt batteries?
many others said it cant operate at 16 Mhz with 3.3 volt but it's working!!!
First you ask about an Atmega328 chip (the bare chip).
Then about an Arduino (the chip with supporting components).
So what is it.
The 3.3volt pin is a power rail on some Arduinos, and only a power output on others.
Give us all the facts (read the "how to post" sticky).
Leo..
Alvin_freeman:
many others said it cant operate at 16 Mhz with 3.3 volt but it's working!!!
Undervolting is like overclocking.
Some functions of the processor might have occasional errors.
The 328@16Mhz is only guaranteed to work reliably between 3.85volt and 5.5volt (see datasheet).
Leo..
Alvin_freeman:
My arduino has a 3.3 volt pin so can I use it directly with 3 volt batteries?
No NO NO
As you say (now) you are using a 16MHz Arduino I assume you mean an Uno or Mega and they work on 5v. The 3.3v pin is just there to power small external loads - such as sensors.
...R