HI, folks.. I am using the lcd Nokia 5110 with adafruit library.. And the power consumption is about 35~50mA.
Is it right or Could I have less consumption using this library? Did anybody have worked with this lcd before?
Tks a lot
Could I have less consumption using this library
No a library will not affect the current draw of a display.
For the next time this is the wrong section for such a question. This section is about setting up your arduino, not with an arduino project like you have.
HI. TKS
but I have posted this topic at "programming section" but the topic was moved to here.
What I wanted to know was how much the display doesn't matter which library use to consume...
The principal consumption of current will be the backlight - which has of course nothing to do with the software.
The rest is pretty immaterial.
Paul__B:
The principal consumption of current will be the backlight - which has of course nothing to do with the software.
True.
I just measured mine as taking under 1mA (can that be right?) without the LED on.
The LED current I measured yesterday as 40mA.
The rest is pretty immaterial.
No, he wants to know the answer.
sickparrot:
The rest is pretty immaterial.
No, he wants to know the answer.
I think that was the answer. 
Paul__B:
sickparrot:
The rest is pretty immaterial.
No, he wants to know the answer.
I think that was the answer.
Yeah, well. 
I took your 'immaterial' as meaning you thought the question was of no importance. Maybe you meant tiny, or insignificant which is helpful as he's wondering if 50mA is normal. (Do you know if < 1mA is correct? Sounds very low to me and wondered if I'd measured it properly.)
I try not to dismiss people's questions even if they appear wrong or silly (not saying that here). I'm often irked by people who tell someone they're 'asking the wrong question' and then answer the question they thought more interesting, leaving the person without a useful answer to the problem they have.
The nature of the libraries is immaterial in regard to how much current the display draws. The libraries only take effect as data is transferred to the display, and since the actual response of the LCD is so slow and the amount of information that needs to be transferred is quite limited, the vast majority of the time, the interface is quiescent, so logically cannot affect current consumption.
What the current consumption is without the backlight, I do not know but given the recent interest in this, I might actually dig out the one I have and play with it.
Regardless of any portent, immaterial really does seem to be the word for it. This might go some way to explain why the current is conspicuously absent from the data sheets.
I did get one out, and I did give it a try.
I couldn't do it.
I didn't come down in the last shower and I have a quality DMM of which there are no grounds to be suspicious. I had a display working to start with but, when I broke in to the 3.3v line with the meter, the display went out. The reading was around 0.04mA.
There may be other ways to do this but that will be down to Paul, if he is inclined. I submit there are two results to be gained
- This isn't worth pursuing.
- The degree of immaterialness is probably quite clear.