ESP32 Forum

I'm using an ESP32 Azure IoT Kit. I want to send temperature and humidity along as telemetry to my IoT hub.

I cannot find almost any information on how to do this. I came across one post here where someone refers to using uint8_t temprature_sens_read() (note that the word temperature is misspelled) and much to my surprise that worked. I've searched the code base in esp-idf and can't find a single file that defines that function. There is no include file, you just "extern" it in your .c file.

I still need to get humidity. I haven't found any documentation or samples about that.

Am I reading temperature the right way? How do I get humidity?

Thanks,
David

P.S. I'm surprised the temperature reading is in F. I'd think C would be a better worldwide standard, and I'm curious about the decision to report in F.

I found this sample, which uses a very different approach than the function I found for temperature earlier.

Is this what is recommended?

https://github.com/espressif/esp-iot-so ... ain/main.c

Thanks,
David

temprature_sens_read is not what you want. It is for reading esp32 internal temperature.

WiFive wrote: ↑

Fri Nov 08, 2019 3:34 am

temprature_sens_read is not what you want. It is for reading esp32 internal temperature.

Gotcha.

In the samples, why are temp and humidity divided by 10?

To convert to decimal

WiFive wrote: ↑

Sat Nov 09, 2019 1:07 am

To convert to decimal

I guess a better way to ask my question is, if my temperature reading is 30.4 C, why is it stored as 304?

I assumed the values are stored with accuracy of 0.1, but as an integer because maybe they store better than floats.

Are you using the HTS221 temp/humid sensor ?

if so: https://github.com/espressif/esp-iot-so ... /README.md

tommeyers wrote: ↑

Sat Nov 09, 2019 1:42 pm

Are you using the HTS221 temp/humid sensor ?

if so: https://github.com/espressif/esp-iot-so ... /README.md

I didn't realize I am, but I am. I took a second look at the spec sheet to confirm. I'm new to MCUs and honestly don't know many things, but I'm learning.

I got a solution working yesterday, but the instructions didn't work. I resorted to copying the relevant components to my project component directory, and it finally built.

Post what you need.

Post what you have tried.

we'll help where we can.

Tom