OLED on V3.2 vs V3.1

[tasrock]

I wrote a program with V3.1 which utilized the OLED. It worked great. I just bought (2) new V3 boards. (1) came in as V3.2 and (1) was V3.1. I uploaded the same program onto the V3.2 board but now the OLED is so dim that I cannot read what it says even with the lights out. I can tell that it is operating though. Before I programmed it the demo was running and it looked good so I don't think the hardware is faulty. I uploaded the same program to the new V3.1 and it worked just like my first V3.1 board.

I haven't seen anywhere where I can set the brightness or contrast of the OLED. Am I just overlooking it?

Do you have any other thoughts on what might cause this?

[tasrock]

Update:
I just received (10) more of the V3.2 today. I powered one up and it looked good with the factory demo. I uploaded the same program as before and the display went dark again. Just enough to tell that there was some text but not enough to read it. I ran the situation by my AI overlord and it came up with a suggestion:

// Make sure Vext is properly configured in setup()
void setup() {
// Turn on Vext
pinMode(Vext, OUTPUT);
digitalWrite(Vext, LOW); // LOW turns on Vext
delay(100); // Give it time to stabilize

display.init();
display.setContrast(255);
// ... rest of your setup code

I found that init and setContrast were already being called in heltec_setup(). I only added this code to my setup() after heltec_setup():
pinMode(Vext, OUTPUT);
digitalWrite(Vext, LOW); // LOW turns on Vext
delay(100); // Give it time to stabilize
This seems to have fixed the issue.

It looks like heltec_ve() was handling this functionality already so now I am just calling heltec_ve(true) right after heltec_setup() in setup() function.

[Basitadam]

Worked for me, too. Thank you

[OneAndOnlyFinbar]

Can confirm this still works and is necessary to increase oled brightness.

[Digitalnorm]

Excellent. Works a treat for me too. Pity Heltec arent very forthcoming

[peterbosch]

Brilliant (literally) - thank you! :-)

[ropg]

I'll make Vext on the default soon, so one has to turn it off explicitly.