Knowledge Base

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====== MicroPython on ESP32 ======

===== Download Firmware =====

https://micropython.org/download/

https://micropython.org/download/?port=esp32

ESP32 / WROOM: https://micropython.org/download/ESP32_GENERIC/

Download latest release .bin, e.g.: **ESP32_GENERIC-20230426-v1.20.0.bin**

===== Virtual Environment =====

<code bash>
python3 -m venv esp_venv

cd esp_venv

source bin/activate

pip install esptool
</code>

===== Installation =====

Plug in the esp32 board.

Check /dev and confirm device is dev/ttyUSB0.  If not, adjust instructions accordingly.

If you are putting MicroPython on your board for the first time then you should first erase the entire flash using:

<code bash>
esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
</code>

From then on program the firmware starting at address 0x1000:

<code bash>
esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 esp32-20190125-v1.10.bin
</code>

==== Port Error ====

If you see this when running esptool.py:

<code>
A fatal error occurred: Could not open /dev/ttyUSB0, the port doesn't exist
</code>

You may need to add yourself to the dialout group:

<code bash>
sudo adduser <username> dialout
</code>

And maybe also this:

<code bash>
sudo chmod a+rw /dev/ttyUSB0
</code>

===== Access REPL =====

Install picocom:

<code bash>
sudo apt install picocom
</code>

Connect:

<code bash>
picocom /dev/ttyUSB0 -b115200
</code>

Hit enter a couple of times, and you’ll see the >>> prompt.

Test:

<code>
>>> import machine
>>> pin = machine.Pin(2, machine.Pin.OUT)
>>> pin.on()
>>> pin.off()
</code>

{{tag>embedded_and_iot python}}