Electronics > Projects, Designs, and Technical Stuff

OLED voltage levels...

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amyk:
Turn down the contrast (command 81h)

alank2:
Thanks amyk, what is the difference between adjusting the iref resistor or contrast?  I've tried turning the contrast down quite a bit and it didn't seem to make a difference, maybe I need to turn it down more.

alank2:
Ok, I can see that a level of 0x00 is dimmer, bright still fine to look at, certainly plenty visible.  0xff is brighter, but I wouldn't call it intensely so.

alank2:
I made it step from 0x00, to 0x8F, to 0xFF, but I only see two brightness steps and only see two distinct steps when monitoring current.

Could I have something connected wrong?  I originally had pin 14 mistakenly connected to vcc directly, but fixed that.  Perhaps it was damaged from that.


--- Code: ---1 c2p connected to 2 via 1uf cap
2 c2n connected to 1 via 1uf cap
3 c1p connected to 4 via 1uf cap
4 c1n connected to 3 via 1uf cap
5 vbat connected to vcc (3.3v), line has 4.7uF cap to ground
6 vbref
7 vss ground
8 vdd connected to vcc (3.3v), line has 4.7uF cap to ground
9 res# to uc
10 scl to uc, 2k pullup to vcc
11 sda to uc, 2k pullup to vcc
12 iref 1M to ground
13 vcomh 4.7uF to ground
14 vcc 4.7uF to ground

--- End code ---

Fungus:

--- Quote from: alank2 on October 02, 2015, 05:40:23 pm ---I made it step from 0x00, to 0x8F, to 0xFF, but I only see two brightness steps and only see two distinct steps when monitoring current.

Could I have something connected wrong?  I originally had pin 14 mistakenly connected to vcc directly, but fixed that.  Perhaps it was damaged from that.

--- End quote ---

I dunno, but it's perfectly possible that that's the correct behavior.

In the datasheet they mention three different brightness levels, FWIW.

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