Stand alone project with 2xAAA batteries

Projects General Guidance
1

Hello, I have a few questions about my project and wondering if anyone could help me.

I am building a fairly basic remote control (few buttons, IR led). I have it all working on the Arduino and breadboard, but now I am ready to make a stand alone version powered by 2xAAA batteries. I am following the standalone tutorial (http://arduino.cc/en/Main/Standalone) but I have some questions.

The tutorial is for 5v. I am using a 3.3v regulator, but do I need to use different capacitors (tutorial says 10uF on either side of the regulator)? Is this even the correct regulator for me?

Straight from my power source (the battery pack) I am getting 2.96v. On the board with the regulator (3.3v) and 2 capacitors (10uF) i am getting 1.96~2v. Does this seem correct?

I put a yellow LED with 47ohm resistor and it barely lights up. Or it lights up briefly then goes out. When I put an LED on the board, should i be using 2v to calculate resistance or 2.96v?

I have 3 clocks: 4, 8 and 16mhz. Do you think the 4mhz clock will be ok for me? (I am sending and receiving IR signals).

I have done searches but I am still big time noobie and it would be awesome if anyone can point me in the right direction. thanks for reading. :slight_smile:

2

When using batteries (3V) there is no need for the regulator.
You may need to reduce freq to 8MHz (or 1MHz), as it may be unstable at 16MHz

The yellow led has ca. 4V voltage drop. Typo!!! 2V
Cuttent is calculates as (3V-2V)/R => 1V/R
I'd skip the led to save power.

3

I used these instructions for my standalone 328 (using 5v).

...R

4

knut_ny:
The yellow led has ca. 4V voltage drop.

Yellow LED's have a voltage drop of about 2,1 V - i don't know where you got the figure of 4 volts from - even a white/blue LED has a voltage drop of about 3,6V which is one of the highest one around.

// Per.

5

Yellow LED's have a voltage drop of about 2,1 V - i don't know where you got the figure of 4 volts from - even a white/blue LED has a voltage drop of about 3,6V which is one of the highest one around.

I know this.. I got the character '4' when pushing the 5th key from top left on my keyboard...
U'll see that my math is OK tho..