Anders Carlsson asked 3 years ago
Hello!
I follow the project ESP32 MQTT – Publish and subscribe with Arduino IDE. I have copied and pasted everything you have written. And Node-red shows it. But the readings from BME280 in the serial monitor show 181.6 and sometimes nan Celicus and humidity 0.00 and sometimes nan. The website shows a gray humidity that changes between 0 to nan and a graph that shows 181 C. I have tested with two new BME280 and have scanned them and it says 0x76. And my BME280 looks exactly like the one you have a picture of and also the letter combination CJMCU. I have checked the connections and they are correct. The LED diode works to turn on and off. Any suggestions on what to troubleshoot?
Regards Anders
Sara Santos Staff answered 3 years ago
Hi.
Do the other sensors work?
It seems that the sensor is broken, or it is not connected properly.
Regards,
Sara
Anders Carlsson answered 3 years ago
No, both the sensors give the same result. And I have measured the voltage on their input and it is 3.3V. Both sensors are new and when you run the ic2 scanner you get 0x76 from them.
Anders Carlsson answered 3 years ago
Then it`s just 2 more cables and the SCK goes to GPIO22 and the other SDI goes to GPIO21.
Anders Carlsson answered 3 years ago
I found another site were they used Arduino UNO and there they have also put the SDO to gnd. So I tested this and then everting works with both of my BME280 sensors. I did a test with the Esp32 and also use the gnd to SDO then everting works perfect. So case is solved.
Regards
Anders
Anders Carlsson answered 3 years ago
After reading a littel more the I found out this. If you do a IC2 scan and it says 0x76 then you have to put the SDO to low (gnd) And then it will work for you.
//Anders
Sara Santos Staff answered 3 years ago
Great!
Thanks for sharing that.
I didn’t know about it.
I’ll close this issue.
If you need further help, you just need to open a new question in our forum.
Regards,
Sara