EMOJI COMPANIONS / ESP32 OLED

PixelA little face. A first big idea.

Meet Pixel: a compact starting point for an expressive desktop robot. Bring an OLED face, a servo and an ESP32 control board together, then explore the relationship between power, wiring and a few lines of behavior.

Build with Pixel Explore the design

Includes assembly, starter wiring and executable virtual JavaScript.

ASSEMBLY PREVIEW/EMOJI

Static illustration · loading 3D

Orbit the actual starter assembly. Open the workbench to edit or run it.

6components

11starter connections

0.48 kgestimated component mass

ESP32 DevKitcontrol platform

Concept illustration · inspect actual geometry above.

A COMPLETE STARTING POINT

Get to know
what's inside.

Compact face, display and expressive servo with 3.3 V GPIO aliases. All 6 components and 11 starter connections remain editable in your own project.

First robotics projectsExpressive interfacesDisplay and servo experiments

View the included component types

Emoji enclosure
2S battery · 2.2 Ah
5 V buck regulator
ESP32 DevKit · virtual controller
Emoji OLED display
Position servo

YOUR FIRST THREE EXPERIMENTS

Build understanding.
One change at a time.

Use the starting assembly to ask better questions about your design. Save a copy, change a parameter and compare what happens.

Inspect the design

Follow the battery and regulator paths into the controller, display and servo.

Try a change

Run the included expression loop and change its timing or display messages.

Compare and learn

Swap a compatible board or power source and inspect the connection checks.

emoji-esp32-oled.jsVIRTUAL API

let previous = '';
function step(robot) {
  robot.drive(0, 0);
  if (robot.brownout || robot.battery.voltage < 6.25) { robot.display('🪫'); return; }
  const face = ['😊', '🤖', '◕ ◕', '😴'][Math.floor(robot.time / 2) % 4];
  robot.display(face);
  robot.servo('servo', 0.45 * Math.sin(robot.time));
  if (face !== previous) { robot.log('Expression:', face); previous = face; }
}

The full, editable starter script is included in the workbench.

KNOW WHAT YOU'RE TESTING