coconuthero
Member
Can anybody tell me how much current the 20*4 OLED needs?
I'am measuring almost 60mA (0.3W) - is this normal?
Thanks!
I'am measuring almost 60mA (0.3W) - is this normal?
Thanks!
That seems abnormally high - current should be very low when the display is off. Does the current consumption drop considerably if the PICAXE-18M2 is removed from the AXE133 PCB or not?I happen to be working on a 20x4 OLED right now.
Just measured 48mA when in operation, or 38mA after a Hide Display (serout LCD,N2400,(254,8)) command.
You mean removing the PICAXE from the AXE134?Having all characters lit or not changes current from 42 to 45 mA.
After disconnecting the AXE134Y the current drops to 570 uA
Remove the PICAXE from the AXE133 then measure the current.I was measuring the current at the source, so PICAXE and AXE134 together.
After disconnecting the AXE134 I measured 570uA for the 08M2 only.
254,12 would normally be a display shift configuration command. Try sending 254,1 for clear screen.After a serout LCD,N2400,(254,12) 'Hide' command the display still draws 32.6mA.
Have you removed the PICAXE-18M2 from the AXE133 PCB? This is to find out if the abnormal current draw is coming from the PICAXE-18M2 on the AXE133 PCB or OLED.At 4.80 Volt, the AXE134Y draws 47.6mA (displaying 4 rows of "88888888888888888888"). Current through AXE134 only, no PICAXE connected.
After a serout LCD,N2400,(254,12) 'Hide' command the display still draws 32.6mA.
Yes. Without the 18M2 current drops by 4mA.Have you removed the PICAXE-18M2 from the AXE133 PCB?
I also had a nasty 15kHz signal when measured over the amp meter. A 470uF capacitor right at the AXE134 board removed most of it.However, the oscilloscope shows a pulsed signal: minpeak=20mA/maxpeak=120mA/f=15kHz
The PCB with the 18M2 on it has 'AXE133' printed on it and the Winstar OLED does not so I called it that so that you can tell exactly which PCB I'm referring too (as both could be 'AXE134Y PCBs').Yes. Without the 18M2 current drops by 4mA.
BTW this concerns the AXE134Y.
In the datasheet for the 16 x 2 I have that's further clarified with ...To make it a little more complicated...according to the datasheet, the typical supply current of a 16x2 oled (Winstar WEH001602E) is 30mA....
I have just re-run my tests on an AXE091 plus AXE133Y. The base current is high because there are a number of unrelated circuits powered. At 5V ...Brightness(nits) / Power consumption(measured with random texts)
125(typical) / 150mW(5V*30mA)
When random texts pattern is running, averagely, at any instance, about 1/2 of pixels will be
on.
#Picaxe 20M2
#No_Data
Symbol LCD = C.0
Pause 1000
SerOut LCD, N2400, (254, $40, $1F,$1F,$1F,$1F,$1F,$1F,$1F,$1F )
Do
Gosub Blank : Pause 5000
Gosub OneLine : Pause 5000
Gosub TwoLine : Pause 5000
Loop
Blank:
SerOut LCD, N2400, ( 254, 1 )
Return
OneLine:
SerOut LCD, N2400, ( 254, $80, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 )
Return
TwoLine:
SerOut LCD, N2400, ( 254, $C0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 )
Return
So your spreadsheet has more detail than the one I found on Winstars website http://www.winstar.com.tw/products_detail_ov.php?lang=en&ProID=284In the datasheet for the 16 x 2 I have that's further clarified with ...
If your display acts the same as mine, a Display Hide command will drop current even more.Display Blanked : 35mA.