micropython

MicroPython on NodeMCU

Prerequisites

pip3 install esptool rshell

Flash micropython firmware

As described in the NodeMCU docs download firmware from micropython.org and flash it with the esptool:

esptool.py --port /dev/tty.usbserial-FA210 write_flash -fm qio 0x00000 esp8266-20190125-v1.10.bin

Run REPL

minicom -s -b115200 -D/dev/tty.usbserial-FA210

MQTT

MQTT & MicroPython

https://raw.githubusercontent.com/pycom/pycom-libraries/master/examples/mqtt/mqtt.py

Then in rshell cp mqtt.py /pyboard/. (Start rshell like so: rshell -p /dev/tty.usbserial-FA210.)

Go back to Arduino

Erase the flash and all will be good for using the Arduino IDE:

esptool.py --port /dev/tty.usbserial-FA210 erase_flash

LED Switcher App

The following files constitute the LED Switcher App:

• index.html: Web page with one radio button
• app.css: CSS for the web page, mostly for styling the radio button.
• app.js: A vuejs app that controls the radio button.
• credentials.py: User-created file that contains WIFI ssid and password
• led-switcher.py: This will be main.py on the NodeMCU.

Create a file credentials.py with this content:

ssid = 'your-ssid-here'
password = 'your-password-here'

It will be read by led-switcher.py.

Copy everything over using rshell:

make copy-all

Press the reset button once to activate the new code.

When WIFI registration is complete the LED blinks a few times.