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Full-Duplex Serial

Full-duplex serial communication allows both outgoing and incoming messages to be sent and received at the same time.  Examples of devices where full-duplex serial communication can be useful include XBee radios, other microcontrollers, and even the SimpleIDE Terminal.  Although the Propeller uses half-duplex serial communication with the SimpleIDE Terminal by default, that can be disabled and replaced with full-duplex serial communication.  This example demonstrates how to use full-duplex serial communication with XBee radios, and also with the SimpleIDE Terminal.

Text File Maneuver List

So far in this series, we’ve been using C language programs to make the ActivityBot go. This time, we will use a C program that opens a text file from the SD card.  The text file contains a program in another super-simple language we are inventing right now. Let’s call it "AB."

The AB programming language has only five commands:

  • forward
  • backward
  • left
  • right
  • end

Each command has a single argument: the number of encoder ticks that set the distance the ActivityBot should travel.

Display Light Levels with Canvas

Here is another example of a sensor affecting an an HTML element's attrubute on a web page.  This time, the shade over a light sensor controls the shade of a drawing canvas.  

Reminder: If you followed the instructions in the Join Another Wi-Fi Network section, you’ll have to replace 192.168.4.1 with your IP address.

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