Espressif's ESP32 - got this board to play around with…

esp32_devkit1.txt

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ESP32-DEVKITV1
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- clone of DOIT's ESP32 DEVKIT V1?
- ESP-WROOM-32 (ESP32-D0WDQ6)
  = ESP32-D0WD-based modules with integrated flash
- DECISION20200822:
  = toolchain and build environment is simply not worth it!
  = WILL USE micropython instead!
 
-----------
micropython
-----------
 
- get some tools
  > pip install esptool rshell
- download binary from https://micropython.org/download/esp32/
  = selected esp32-idf3-20191220-v1.12.bin
  = idf4 seems to be missing LAN? stick with idf3 for now...
- erase flash
  > esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
- flash micropython
  > esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 <bin>
- use rshell to manage code (vfs)
  > rshell --port /dev/ttyUSB0 --buffer-size=32
- download file in rshell
  > cp <file> /pyboard[/<more_path>]
 
----------
board info
----------
 
esp32 doit devkit v1
vid = 0x10c4
pid = 0xea60
sn = 0001
 
esp32 doit devkit v1 (aliexpress - usb type c)
vid = 0x1a86
pid = 0x7523
sn = (null)

Decided to use micropython. Pinouts shown below (Disclaimer: Image copied from RandomNerdTutorials).

(Disclaimer: Sorry, I can't remember where I got the following two from…).

Below is a simple python script to test SSD1306 OLED display which makes use of this micropython library code.

test.py

from machine import Pin, I2C
from ssd1306 import SSD1306_I2C
from time import sleep
 
def run_this():
  i2c = I2C(-1, scl=Pin(22), sda=Pin(21))
  oled_width = 128
  oled_height = 64
  oled = SSD1306_I2C(oled_width, oled_height, i2c)
 
  oled.text('Hello, World 1!', 0, 0)
  oled.text('Hello, World 2!', 0, 10)
  oled.text('Hello, World 3!', 0, 20)
  oled.show()

Using Arduino IDE:

• select Preferences>Additional Board Manager URLs
• enter https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json.
• open Boards Manager and install esp32 (search for it)
• when selecting board for upload, select DOIT ESP32 DEVKIT V1

Note: esp32 flash tool requires python serial module (e.g. pip install pyserial)