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The ESP32-C3 OLED expansion base seen from above at an angle: a black board with two mounting holes along the far edge, a slide switch at the left, a charge LED at the right, two tall black sockets down the middle for the ESP32-C3 OLED board, a white battery connector between them, and down each side a yellow socket strip beside a strip of upright pins, with the pin numbers printed beside them.
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This board opens in a VR headset: life-size, or big enough to stand beside, with every pin and every part named where it sits. Open this address in the browser on a headset such as Apple Vision Pro or Meta Quest.

learn.lonelybinary.com/vr/c3base
You have this

ESP32-C3 OLED Expansion Base (2.54 mm)

A 25 × 20.5 mm ESP32-C3 board with a 72 × 40 OLED already wired to GPIO 5 and 6, and three bases it seats on, each with a battery connector, charger and switch: 2.54 mm pins, push-in terminals or screw terminals.

Holes
16GPIO and power, brought out
Each side
8 + 8pins and sockets at 2.54 mm
Size
39.5 × 32.5mm
Height
10.1mm from the underside
Start here · 10 The expansion baseOpen the base in 3D

Turn it over, click any pin on either strip, and see which GPIO it is and what already has it.

Product questions & answers ↓

The ESP32-C3 OLED and its three bases

One ESP32-C3 OLED board, three bases it seats on: 2.54 mm pins, push-in terminals or screw terminals. Each base carries the same battery connector, charger and power switch.

See this board 72 × 40pixel OLEDESP32-C3 OLED Development BoardChip: 160 MHz RISC-V
You have this16GPIO and power, brought outESP32-C3 OLED Expansion Base (2.54 mm)Each side: 8 + 8 pins and sockets at 2.54 mm
See this board 2 × 8at 3.5 mmESP32-C3 OLED Pluggable Terminal BaseBase size: 53.1 × 32.5 mmSee this board 16ESP32-C3 OLED Screw Terminal BaseTerminals: 2 × 8 at 3.5 mm
The whole handbook17 articles · 100 minQuick referencePDF · 577 KB3D model (GLB)GLB · 4.2 MBCAD model (STEP)ZIP · 3.9 MBDrawing (DXF)ZIP · 190 KBDrawing (PDF)PDF · 2.9 MBPinout and specsThe pin table, and the questions people ask first
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ESP32-C3 OLED Expansion Base (2.54 mm)

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ESP32-C3 OLED Expansion Base (2.54 mm)
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Order or missing parts?

Email us or reply to your order, and quote c3base — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.