B4R Question Si7021 temperature & humidity


Active Member
Licensed User
Longtime User
Hi all, I tested my GY-21P sensor and works on arduino ide with this library:


I've seen there is no b4r library, I tryed to build my own library for b4r, but with no succes, I think is easy to do, but not for me, can someone help me to use this sensor with ESP8266?
thanks in advances.
and it works also with Adafruit_BME280, but doesn't read humidity, but pressure, so I think it can read both...
Last edited: