Pages: [1]   Go Down
Author Topic: 3.3v for Nokia 5110 LCD  (Read 1185 times)
0 Members and 1 Guest are viewing this topic.
Dee Why NSW
Offline Offline
Full Member
***
Karma: 5
Posts: 206
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have just received one of these. It's the red one that looks like the Sparkfun. I have seen a few installation diagrams for these and the like, and they all seem to avoid the Arduino 3.3v supply, providing a new regulator or divider instead. Am I missing something?

I thought all Arduinos had have a 3.3v source included and I would have thought the obvious thing is to use it.

Logged

SE USA
Offline Offline
Faraday Member
**
Karma: 41
Posts: 3783
@ssh0le
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

the older arduinos got the 3.3 volt supply from the FTDI chip, and it was able to supply exactly "jack squat" current, so maybe the requirements of the LCD were too much and its a legacy thing

Logged


Dee Why NSW
Offline Offline
Full Member
***
Karma: 5
Posts: 206
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks

My boards all just a few weeks old.  I imagine these things run on the smell of a thin oily rag, and it seems the light can be run off a separate supply.
Logged

0
Offline Offline
Shannon Member
****
Karma: 200
Posts: 11672
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

3V3 from Arduino is 50mA max I think, it all depends how much current the backlighting LEDs take...
Logged

[ I won't respond to messages, use the forum please ]

Dee Why NSW
Offline Offline
Full Member
***
Karma: 5
Posts: 206
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

t all depends how much current the backlighting LEDs take...

Thanks

I guess what is more to the point is where the LEDs get their power from. In my case, they are wired separately and can be run off 5v. I don't know if this is typical.
Logged

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

The lcd is specified for 3.3v but works under 5v as well.

The led, if its anode / cathode are wired out separately, can be powered by pretty much anything.
Logged

Pages: [1]   Go Up
Jump to: