Lonely Binary
The ESP32-S3 expansion base seen from above at an angle: a black board with four corner mounting holes, a white fifteen-way ribbon socket at the far end, two tall black sockets down the middle for the ESP32-S3, and down each long edge a white strip of upright pins and a yellow strip of pins side by side, with the pin names printed beside them.
VR

View it in VR

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/s3base
You have thiss3base

ESP32-S3 Expansion Base (2.54 mm)

Four bases for the 44-pin Lonely Binary ESP32-S3. Which GPIOs each one brings out, which way round the board goes, the fifteen-way display plug they all share on the same GPIOs, and the 36 LEDs on the PinPulse that cannot disturb I²C or SPI.

GPIOs out
28
Strips
4 × 20pins at 2.54 mm
Display port
15way FPC
Start here · 04 The expansion baseOpen the base in 3D

Turn it over, click any pin on either strip, and see which GPIO it is and what the ESP32-S3 can do with it.

Product questions & answers ↓

The four ESP32-S3 bases

One ESP32-S3, one display plug on the same GPIOs, four ways to wire to it: pins, push-in terminals, screw terminals, or pins with an LED on every GPIO.

See this board 36one per GPIOESP32-S3 N16R8 PinPulse Shield, 36 GPIO LEDsRows a side: 2 × 22 pins and sockets
You have this28ESP32-S3 Expansion Base (2.54 mm)Strips: 4 × 20 pins at 2.54 mm
See this board 24ESP32-S3 Pluggable Terminal BaseTerminals: 2 × 12 at 3.5 mmSee this board 26ESP32-S3 Screw Terminal BaseTerminals: 2 × 15 at 3.5 mm
The whole handbook22 articles · 100 minQuick referencePDF · 557 KB3D model (GLB)GLB · 6.3 MBCAD model (STEP)ZIP · 6.4 MBDrawing (DXF)ZIP · 191 KBDrawing (PDF)PDF · 2.7 MBPinout and specsThe pin table, and the questions people ask first
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ESP32-S3 Expansion Base (2.54 mm)

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ESP32-S3 Expansion Base (2.54 mm)
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Order or missing parts?

Email us or reply to your order, and quote s3base — 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.