Hi.
Do you get any errors on the Serial Monitor?
If so, tell me which errors do you get?
 
If you don’t get any errors, it’s probably a problem with the wiring.
 
You can try to run a sketch just to test the display if you’re not sure if it’s working properly: 

Guide for I2C OLED Display with Arduino

 
Let me know if this helps.
 
Regards,
Sara
Regards,
Sara

Hi:
Thanks for the article you provided. I tested with a new OLED and ran the sketch of i2c communication and it worked properly. Then I tried the sketch with the DHT to measure temperature and humidity and it worked well too. What struck me was the library called Adafruit Unified Sensor, which was not mentioned in the weather station project. I don’t know why the weather station project didn’t work. It seems that something went wrong with the RTC 1307 or GY68-BMP180 modules (overpowered with 5V instead of 3.3V?). I will investigate this project further. Some successful steps have been taken and this encourages me to go on. Thank you very much.
Luix

Hi.
Usually, the Adafruit unified sensor is automatically installed when you install a library that requires it (a window in the Arudino IDE will pop up asking you if you want to install that library).
 I don’t think you overpowered the sensor (unless stated on the sensor itself that it requires only 3.3V)
 
Regards,
Sara

Hi,
Do you know if OLED devices are problematic? I did the temperature and humidity project yesterday without any problem and I did it again from scratch and I didn’t manage to get the OLED to work properly. I have worked with OLED using ESP32 and ESP8266 without any problems, but with Arduino it is cumbersome.
Regards
Luix

Hi.
No. I never had problems with the oled on any board.
regards
Sara

Let me know if you have some more information that can help troubleshooting this problem.