Remote Control

Experiment

• Modify this program and change the code for the web page buttons to do something else.
  Ideas:

  • Move the servo up, move the servo down

  • Drive forward, stop, turn left, turn right

  • Convert the Blockly program to Python and control the LED on  the Button and LED module 

  • Your ideas?

Alternative remote control - XRP as WiFi access point

Review Using the XRP Webserver

With this method, the XRP is the WiFi access point -- it does not connect to a WiFi router.

• In the XRP Code Editor, create a new Python program with the following content, replacing <your_name> with your name.
  (You won't actually be using "wifi_ssid" and "wifi"password" for this example.)

{
    "wifi_ssid": "workshop",
    "wifi_password": "arduino1",
    "robot_id": "<your_name>",
    "ap_ssid": "XRP {robot_id}",
    "ap_password": "remote.xrp"
}

• Save the file as  "secrets.json" at the  root folder level. (Note this is  not a Python  file and does not have the .py filename extension.)
  
  

• In the  XRP Code Editor,  open the file  XRPExamples ...webserver_example.py and run it.

• Notice the following output:
  Starting Access Point "XRP <your_name>"

• Connect your laptop to the WiFi with the above name.  The password is "remote.xrp" as you entered in the secrets.json file.

• Note this output:
  Starting DNS Server at 192.168.4.1

• On your laptop,  go to  this  IP address in your browser.

• Control your  XRP from a web page!

XRP remote control projects

If you're comfortable with Python (actually MicroPython, of course...) you can use the WiFI and Bluetooth capabailties of the Raspberry Pi Pico to create all sorts of remote control and communication projects.

Advanced Web Interface

If you know Python and html, you might want to use this example to build a project with the user interface of your design.

The XRP webserver code is in:
lib ... XRPLib ... webserver.py

Take a look at this code and consider how you can modify this to:

• Change the .html layout (buttons, text, colors, etc.)

• Add more controls as you'd like.

Bluetooth XRP to XRP communication

To send messages between two XRP robots, you use the built-in Bluetooth Low Energy (BLE) capabilities of their onboard Raspberry Pi Pico W. By writing standard MicroPython scripts that utilize the bluetooth library along with XRPLib, one robot can act as the Central (transmitter) to send instructions to another robot acting as the Peripheral (receiver).

You can user for favorite AI tool to help you explore  all this.