16F872 and LCD

[Fredrick]

The LCD does not have a backlight becouse it´s an (HD44780) OLED
For 2 years or so i use the same OLED whit an 16F84 and the same code to and then i worked

No it has not an heat sink, but it is capable of 1.5 A whitout an heat sink and that is more then i need.

http://www.fractronics.com/oled1_b.jpg

[Pic_User]

Hi Fredrick,

The LM317 package would be rated at 1.5A with a very good heat-sink and the correct input voltage, to avoid, dropping too much voltage and heating itself.
(input – output differential V)
http://cache.national.com/ds/LM/LM117.pdf

With no heat sink, 15 V input 5 V output, the 317 could overheat with just over 200 mA at 25 C.

Regulator Heatsink Calculator
http://www.ef-uk.net/data/heatsinking.htm

How much current does the OLED LCD display draw?

Is the voltage regulator getting hot (to your touch)?
Can you “oscilloscope” the +5V supply? Watch for the voltage to dropout.

-Adam-

[Fredrick]

Hi Fredrick,

The LM317 package would be rated at 1.5A with a very good heat-sink and the correct input voltage, to avoid, dropping too much voltage and heating itself.
(input – output differential V)
http://cache.national.com/ds/LM/LM117.pdf

With no heat sink, 15 V input 5 V output, the 317 could overheat with just over 200 mA at 25 C.

Regulator Heatsink Calculator
http://www.ef-uk.net/data/heatsinking.htm

How much current does the OLED LCD display draw?

Is the voltage regulator getting hot (to your touch)?
Can you “oscilloscope” the +5V supply? Watch for the voltage to dropout.

-Adam-

Ok thanx

The VR is not getting hot.

Edit: Heat sink is added just in case...
http://www.elfa.se/elfa-bin/dyndok.p...dok=245171.htm

[skimask]

The LCD does not have a backlight becouse it´s an (HD44780) OLED
For 2 years or so i use the same OLED whit an 16F84 and the same code to and then i worked

No it has not an heat sink, but it is capable of 1.5 A whitout an heat sink and that is more then i need.

Know what else might help?

If you bought a legit copy of PicBasicPro from a vendor instead of download an old version of 2.45 from who knows where!

[Fredrick]

Know what else might help?

If you bought a legit copy of PicBasicPro from a vendor instead of download an old version of 2.45 from who knows where!

That diden´t solve my problem, i still have o use the resistor in serie with Enable.

[Acetronics2]

That diden´t solve my problem, i still have o use the resistor in serie with Enable.

Hi, Fredrick

Why not send us you REAL scheme ??? ... and may be a link to your Oled Datasheet ( couldn't find anything about it yet ...)

looking at various OLED displays Datasheet it seems :


DEFINE LCD_COMMANDUS 4500
DEFINE LCD_DATAUS 150

are the values to use ... not so fast, those OLEDs !!!

Alain