Upstream/esphome-docs
1
0
Fork 0
mirror of https://github.com/esphome/esphome-docs.git synced 2024-12-28 17:48:35 +01:00
Code Issues Projects Releases Wiki Activity

SHT3xd component - Provide example i2c configuration for >50-100Khz i2c frequencies on IDF (#3921)

Browse Source 
* Update for higher i2c frequencies on IDF

* Update sht3xd.rst
This commit is contained in:
mrtoy-me 2024-06-08 01:03:37 +10:00 committed by GitHub
parent 3e814bfd88
commit 52179cea24
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
components/sensor/sht3xd.rst
View File

@ -54,6 +54,24 @@ Configuration variables:
but can also increase temperature readings and decrease humidity readings as a side effect. but can also increase temperature readings and decrease humidity readings as a side effect.
Defaults to ``false``. Defaults to ``false``.
I²C Configuration when using Higher I²C Frequencies
---------------------------------------------------
When using the **IDF framework** and **I²C frequencies greater than 50-100kHz**, the I²C configuration needs to include a **timeout** option.
On an ESP32, the Arduino framework has a default I²C timeout of 50ms whereas on IDF framework, the default timeout is 100us.
At these higher I²C frequencies, the default I²C timeout on IDF framework causes a "Communication with SHT3xD failed" error on setup.
A solution that has been tested on ESP32 at 800kHz, is to increase the I²C timeout to 10ms as per the following example.
.. code-block:: yaml
# Example I²C configuration
i2c:
sda: 21
scl: 22
scan: true
frequency: 800khz
timeout: 10ms
See Also See Also
-------- --------