Azman @UniMAP

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====== Seeed Studio's XIAO ======

Based on SAMD21 (Cortex-M0)

//**Note**: Arduino IDE Board Setup (https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json)//

Pinouts shown below (//Disclaimer: Image copied from some online page.//). 

{{:notes:devs:seeeduino_xiao_samd21_pinout1.jpg?direct&400 |Seeduino XIAO SAMD21 Pinout}}

====== ESP32 DEVKIT ======

Espressif's ESP32 - got this board to play around with...
<file text esp32_devkit1.txt>
--------------
ESP32-DEVKITV1
--------------

- 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)
</file>

Decided to use [[https://micropython.org/|micropython]]. Pinouts shown below (//Disclaimer: Image copied from [[https://randomnerdtutorials.com/|RandomNerdTutorials]]//). 

{{:notes:testing:esp32_devkitv1_pinout_30.png?direct&600|ESP32 DEVKIT1 Pinout}}

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

{{:notes:testing:esp32_devkitv1_pinout_30.jpg?direct&600|ESP32 DEVKIT1 Pinout (30-pins)}}

{{:notes:testing:esp32_devkitv1_pinout_36.jpg?direct&600|ESP32 DEVKIT1 Pinout (36-pins)}}

Below is a simple python script to test SSD1306 OLED display which makes use of [[https://github.com/micropython/micropython/blob/master/drivers/display/ssd1306.py|this]] micropython library code.
<file python 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()
</file>

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'')

====== ESP01S WiFi Module ======

Actually has an esp8266 controller (can be a standalone... e.g. NodeMCU). I primarily use this as WiFi module for 8051 systems.

<file text esp01s_info.txt>
Upgraded ESP-01S ESP8266 Serial WIFI Wireless Module Wireless Transceiver
- ESP01S ESP8266-01S (stronger antenna signal compared to esp01)
- 1MB flash (from 512M)
- Integrated WEP, TKIP, AES, and WAPI engines. 802.11 b/g/n
- Wake up and transmit packets in 2ms
- standby power consumption of 1.0mW (DTIM3)

Feature:
- Power down leakage current <10uA
- Integrated low power 32-bit CPU could be used as application processor

------
|ANT.|
|    |
|    |
|8765|
|1234|
------

1|tx|
2|ch_pd|1-enable
3|rst|0-reset
4|vcc|3.3v
5|rx|
6|gpio0|0-flash mode (def), 1-uart mode (prog)
7|gpio2|gpio
8|gnd|
</file>