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Network Extended

Table of Contents

Prolog

Now that you've learned a few basics about network functions, here are a few application examples.

Toggle LEDs via Website

In this example, a website is displayed in the browser using station mode. There are two toggle options on this web page to turn LEDs on or off.

The example is kept very simple (without further checks). Once you have understood it, you can expand it at any time.

Requirements

  • mandatory 2x LEDs (any color)
  • mandatory 2x resistors (min. 220 ohms)
  • mandatory internet connection
  • few cables
  • optional a breadboard

Circuit

012_circuit_diagram_led_server.png

Code

# create script
$ touch ~/Projects/ESP/examples/network/led_controller_webserver.py

# create html
$ touch ~/Projects/ESP/examples/network/index.html

Source Code for led_controller_webserver.py

Source Code for html index.html

Source Code for boot.py

Adjust the constants (boot.py and led_controller_webserver.py) according to your needs and check the circuit. Connect the microcontroller and transfer the files.

# copy script as main.py
(venv) $ rshell -p [SERIAL-PORT] cp examples/network/led_controller_webserver.py /pyboard/main.py

# copy html
(venv) $ rshell -p [SERIAL-PORT] cp examples/network/index.html /pyboard/

# copy boot.py
(venv) $ rshell -p [SERIAL-PORT] cp examples/network/boot.py /pyboard/

# start repl on microcontroller
(venv) $ rshell -p [SERIAL-PORT] repl

To start press reset key or start with keys Control + d. To interrupt press keys Control + c. To finish the rshell - repl session, press keys Control + x.

If you don't know the IP, use for example $ arp -a (inside local terminal) and then enter 'http://[IP OF MICROCONTROLLER]' in the browser.

Control NeoPixel from AdafruitIO

With an Adafruit account, you can also use Adafruit IO (for free)! This gives you the opportunity, for example, to create IoT dashboards and actions that display your measured values or to control devices. Here is an example to control the color of your NeoPixel (from computer or mobile).

Requirements

  • mandatory Adafruit IO Account (free Adafruit IO Basic plan)
  • mandatory 1x NeoPixel (Strip or Ring or Matrix)
  • few cables
  • optional a breadboard

Adafruit IO

If you don't have an Adafruit account yet, sign up and log in to adafruit.io.

The free Adafruit IO Basic Plan is enough for this tutorial. There is no need to add any Device, Action or Power-Up to create Feeds and Dashboards!

Steps

  1. create a new feed (incl. name) and note down feed key
  2. create a new dashboard (incl. name)
  3. via Dashboard Settings > Edit Layout > Create New Block add Color Picker
  4. choose the feed for Color Picker and press Next step
  5. select a Test value and press Create block
  6. save all your settings Dashboard Settings > Edit Layout > Save Layout
  7. note down IO_USERNAME and IO_KEY

Pinout Table

NeoPixel ESP32
GND GND
DIN 23
5V 5V5

Code

# create script
$ touch ~/Projects/ESP/examples/network/adafruit_io_neopixel.py

Source Code for adafruit_io_neopixel.py

Source Code for boot.py

Adjust the constants (boot.py and adafruit_io_neopixel.py) according to your needs and check the circuit. Connect the microcontroller and transfer the files.

# copy script as main.py
(venv) $ rshell -p [SERIAL-PORT] cp examples/network/adafruit_io_neopixel.py /pyboard/main.py

# copy boot.py
(venv) $ rshell -p [SERIAL-PORT] cp examples/network/boot.py /pyboard/

# start repl on microcontroller
(venv) $ rshell -p [SERIAL-PORT] repl

To start press reset key or start with keys Control + d. To interrupt press keys Control + c. To finish the rshell - repl session, press keys Control + x.

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