Is there a way to control the brightness of the I2C displays? Googled it and tried the potentiometer across the jumper pins but no luck. Removing the jumper had no effect it's like the board is bypassing the jumper. Saw pwm control but that looks like it needs aurdino code to do it that way.
#2004 LCD Display Brightness
pearl bluff
dusky cradle
The jumper marked LED is supposed to feed the power to the backlight but some i2c adapter boards have a flawed design and bypass this jumper. I had to desolder and remove the two pins from the i2c board that feed the lcd backlight leds and then solder two wires directly on the LCD holes were the pins used to be.
Pwm applied to the positive wire achieved brightness control on the LCD screen.
pearl bluff
So desolder A,K from both boards and wire the potentiometer directly to the LCD?
Or desolder A and place the pot between there and VDD?
dusky cradle
No. I don't recommend using a potentiometer. Leds have a narrow band of voltage where they operate. You should use PWM instead.
You might get away with just de soldering A
pearl bluff
Could you explain how to use PWM
dusky cradle
Just connect the wire to a PWM capable pin of your Arduino. You can then control it from Mobiflight like any other led.