Electronics > Projects, Designs, and Technical Stuff
OLED voltage levels...
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.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version