Connecting sensors to the ESP8266 via I2C and 1-wire simultaneously

czareqpl wrote:

I have an ESP8266(WeMos D1 mini) to which I want to connect BME280 and DHT22 sensors. My question is if I connect BME280 via I2C(GPIO4 and GPIO5) and DHT22 via 1-wire(GPIO14) will it work? Will there be any problems? Will it be able to be programmed without problems? Suggest some example code.

Hello!

Connecting the BME280 and DHT22 sensors to the WeMos D1 mini, as you described, is perfectly feasible and should not cause any major problems. The ESP8266 has enough GPIOs to support both sensors, and the use of different communication protocols (I2C for the BME280 and 1-Wire for the DHT22) allows both devices to coexist on the same board without conflict.

This is sample code for the Arduino IDE that illustrates how data can be read from both sensors:




Some notes:
1. Check the exact I2C address for your BME280 sensor (could be 0x76 or 0x77) and set it accordingly in the `bme.begin()` function.
2. The GPIOs used in this example (D1, D2, D5) are the GPIOs on the WeMos D1 mini board, which correspond to the following pin numbers on the ESP8266: D1 is GPIO5, D2 is GPIO4, D5 is GPIO14. Make sure you use the correct pin designations according to the pin table of your WeMos D1 mini module.
3. I have used the `Adafruit_Sensor`, `Adafruit_BME280` and `DHT` libraries in the code. Make sure you have these installed in your Arduino IDE environment (you can add them via the Library Manager).

Maintain standard programming practices, such as regular sensor availability checks and error handling, to ensure your code is reliable under different conditions.

Good luck with your project! If you have any questions or encounter problems, please feel free to write - I'll try to help.