Wireless Stick OLED, I2C and TFMINI-S LIDAR

#1

I’m trying to use the TFMINI-S LIDAR using i2c interface on Wireless Stick.

My setup looks like this:

void setup() {
Heltec.begin(true , false, true );
Heltec.display->clear();
Heltec.display->drawStringMaxWidth(0, 0, 64,“Init OK”);
Heltec.display->display();

Serial.begin(115200);
delay(2000);
Wire1.begin(SCL, SDA, 400000);
delay(2000);
}

The LIDAR and display works, but the display goes dim after the Wire1.begin()
The display also flickers when I talk to the LIDAR.

Is there a way to make the display stay bright all the time?

#2

Maybe the current is not enough, try an external power supply

#3

Thanks for good tip! The LIDAR runs on 5v and has it’s own power. Comminication with Wireless stick is on 3.3v.