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microReticulumTbeam/exercises/02_oled_display/README.md

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Exercise 02: OLED Display

This exercise demonstrates multiple OLED rendering patterns on the LilyGO T-Beam Supreme (SH1106).

The firmware runs 3 demos in sequence, then shows a restart banner and repeats forever.

Demo Sequence

Demo 1: Scrolling Text

  • Shows Hello #<n> lines.
  • New lines are added below prior lines.
  • Up to 5 lines are visible; old lines roll off the top.

Demo 2: Fill Then Erase

  • Displays Count 1 through Count 10.
  • Shows a short Clearing screen... message.
  • Erases the OLED to demonstrate explicit clear behavior.

Demo 3: Multi-Page Rotation

  • Rotates through 3 distinct text pages.
  • Each page has different content/layout to demonstrate refresh transitions.
  • Includes a changing packet counter field on one page.

Restart Banner

  • Shows Restarting 3 demos for 5 seconds.
  • Sequence restarts at Demo 1.

Expected Serial Output

Serial output (115200) prints phase changes, for example:

  • Demo 1/3: scrolling Hello #
  • Demo 2/3: clear screen after 10
  • Demo 3/3: three-page rotation
  • Restarting 3 demos

Build

From this directory:

source /home/jlpoole/rnsenv/bin/activate
pio run -e node_a

Upload

Set your USB port:

source /home/jlpoole/rnsenv/bin/activate
pio run -e node_a -t upload --upload-port /dev/ttyACM0

Serial Monitor

screen /dev/ttyACM0 115200