hello, maybe this does not have much to do with arduino, but I would be very helpful if you could answer or help me.
I want to use LCD KEYPAD SHIELD with an ESP32 (the specific model is esp32-WROOM-32U of 38 pins), and I've been reviewing videos, documents, etc..
The problem is that despite everything I have checked the screen does not work, or stays black or just turns on the blue light.
Is there something I am doing wrong?
As your question does not relate to the Nano ESP32 it has been moved to a more generic category of the forum
Yes, not posting details of how you connected the two boards. For instance, what type of interface does the LCD use ?
okay okay thank
I was using this diagram to guide me 14.- Conectar una pantalla LCD al ESP32.ino - Wokwi ESP32, STM32, Arduino Simulator
I was also guided by this video and it didn't work for me either.
and I just want to use the display, I want it to show the distances of some ultrasonic sensors.
It is not clear where you are getting Vcc but if it is less than 5v you are going to run into a contrast problem with your display.
In order to get a visible display the voltage V0 (LCD pin 3) must be about 4.5 volts less than the voltage Vcc (LCD pin 2).
If Vcc is 3.3v then the "GND" connection of your potentiometer must actually be connected to a source of negative voltage. You can test this out by using a battery between the "GND" terminal of your potentimeter and the black wire in your diagram. Battery '-' to the potentiometer and battery '+' to the black wire.
Don
1 Like
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.