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****************************
Olimex ESP32-C3-DevKit-Lipo
****************************
Notes on the ESP32-C3-DevKit-Lipo_ boards from Olimex.
.. _ESP32-C3-DevKit-Lipo:
https://www.olimex.com/Products/IoT/ESP32-C3/ESP32-C3-DevKit-Lipo/open-source-hardware
Arduino
=======
Version 1.8 of Arduino (as installed from debian packages) is ok.
Setup
-----
* Under File → Preferences, add the espressif URL to the Additional
Boards Manager URLs field. (on 2024-09-04 that's
``https://dl.espressif.com/dl/package_esp32_index.json``).
* Under Tools → Board → Boards Manager make sure that you install a
version of esp32 by Espressif Systems that is above 2.0 (on 2024-09-04
there is a 3.0.4 that works).
Programming
-----------
These are the settings used:
:Board: ESP32C3 Dev Module
:Upload Speed: 115200
:Flash Frequency: 80MHz
:Partition Scheme: Default
:Core Debug Level: None
:Erase All Flash Before Sketch Upload: Disabled
:USB CDC On Boot: Enabled
It may be necessary to bring GPIO9 to GND to force the board into
bootloader mode before loading sketches.
Battery Measurement
===================
The battery voltage can be read on GPIO3 after closing the jumpers
BAT_PWR_E1 and BAT_SENS_E1 with the following arduino code::
float battValue = analogReadMilliVolts(3) / 500.0 ;
See also
========
* `The post on my blog with the original version of these instructions
<https://blog.trueelena.org/blog/2023/04/30-programming_the_ESP32-C3-DevKit-Lipo_with_arduino/index.html>`_
* `Explanation on battery measurements in a GitHub issue
<https://github.com/OLIMEX/ESP32-C3-DevKit-Lipo/issues/1#issuecomment-1486468781>`_
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vim: set filetype=rst:
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