BME280 and pressure with 2 decimals

Community Help With My Project Helped
1

Hi everybody!

This is not my first time dealing with ESP8266+BME280+MQTT, but this is my first time using Cayenne. I have an issue with displaying pressure with 2 decimals, if I use:

P = bme.readPressure() / 100.0F;

Cayenne.virtualWrite(2, P, “bp”, “hpa”);

I get value of 1004, if I remove (100.0F) I get value of 100482, inside of Cayenne interface when I try to set 2 decimals, I get 100482.00, instead of moving decimal to the left it moves it to the right and adds 00.
Does anyone have any recommendations how to fix this? Thanks in advance.

2

you need to send the decimal point from the device itself. From cayenne when you change decimal it only add the 0 after the decimal point.

3

Before this I was using MQTT (Mosquitto) + InfluxDB + Grafana, and with this code I was getting value with 2 decimals without any modifications.
I’m trying to figure out why there seems to be an issue with Cayenne…

4

are you using float P ?

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5

I didn’t…
That fixed it! Thanks so much Shramik for you help!

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