Open source · Apache-2.0

The desktop robot
you build yourself

Pebble-chan looks at you, talks back and nods along. Every part that makes it work is in one box, printed shell included.

₹11,999₹16,999Save ₹5,000

Reserve a kit →See what it does

1–2 wks
Dispatch
₹0
Due today
11
Parts inside
100%
Open source

Pan M1+00.0°Tilt M2+00.0°Travel300.0°

Display

320 × 240 IPS

MCU

ESP32-S3

Servos

2 × SCS0009

U1M5Stack CoreS3 LiteM1SCS0009 bus servo — panM2SCS0009 bus servo — tiltA1Waveshare bus servo driverJ1FE-URT-1 servo programmerPS15 V 3 A power supplyH13D-printed shell and bracketsW120 cm Dupont cable setW2Grove to jumper adaptersF1M2×8 and M3×16 fastenersC11000 µF 16 V capacitors

Watch it run

Thirty seconds, no narration

Assembled kit tracking a face, talking, and being picked up mid-sentence.

Media slot

Product demo video

Drop the real clip in here — the layout is already sized for 16:9.

What it does

Not an ornament. It runs.

Every tile cites the part that provides it.

320 × 240

It has a face

Blinks, breathes and changes expression on its own.

U1 · 2.0" IPS display

It turns to look

Pan and tilt, each reporting where it actually got to.

M1 + M2 · SCS0009

CAM

It can see

Onboard camera. Point the head at whoever is talking.

U1 · GC0308

IN · OUT

It talks and listens

A 1 W speaker and two mics. No extra module.

U1 · AW88298 + ES7210

It gets online

Wi-Fi and Bluetooth. Wire it to whichever API you like.

U1 · ESP32-S3

You rewrite all of it

JavaScript on the Moddable SDK. The controller is a stock CoreS3, so Arduino and M5Unified work too. Clone it and go.

Apache-2.0JavaScriptArduino / C++

$ git clone https://github.com/
      meganetaaan/stack-chan.git
$ cd stack-chan && npm i
$ npm run setup -- --device=esp32
$ npm run flash
# the face comes up. ▋

In the box

Eleven parts. Nothing else to buy.

Including the printed shell and the fasteners. You supply a USB-C cable and a computer.

You assemble it — that is the point

Everything in the kit laid out beside its box: the controller, a bus servo, the driver board, the USB programmer, the power supply and cable, the printed shell and brackets, servo horns, jumper and JST cables, capacitors, and the fasteners.

U1× 1

M5Stack CoreS3 Lite

ESP32-S3 controller with a 2.0" touch display, camera, dual mics and speaker. This is the face and the brain.

M1× 1

SCS0009 bus servo — pan

6 V, 2.3 kg·cm, 300° of travel. Turns the head left and right.

M2× 1

SCS0009 bus servo — tilt

Same servo, its own address on the bus. Nods the head up and down.

A1× 1

Waveshare bus servo driver

Drives both servos over one RS485 pair and carries the servo power rail.

J1× 1

FE-URT-1 servo programmer

USB to TTL. Set servo IDs and centre positions from your laptop.

PS1× 1

5 V 3 A power supply

5.5 mm DC plug, sized so both servos can stall at once without a brownout.

H1× 1 set

3D-printed shell and brackets

Printed here and shipped with the kit. You do not need a printer.

W1× 1 set

20 cm Dupont cable set

40-pin, male/male, male/female and female/female.

W2× 5

Grove to jumper adapters

Breaks PORT.A out to individual jumpers for bench work.

F1× 1 set

M2×8 and M3×16 fasteners

High-tensile, black oxide, countersunk so the shell sits flush.

C1× 4

1000 µF 16 V capacitors

Bus decoupling. Stops servo inrush from browning out the controller.

Specifications

Read the whole datasheet

Stock M5Stack and Feetech parts, named exactly. Look them up before you buy — we would.

U1M5Stack CoreS3 Lite16 specs

MCU	ESP32-S3 · Xtensa LX7 dual-core @ 240 MHz
Flash / PSRAM	16 MB / 8 MB
Display	2.0" IPS · 320 × 240 · ILI9342C
Touch	Capacitive · FT6336U
Camera	GC0308 · 0.3 MP
Microphone	ES7210 codec · dual input
Speaker	AW88298 I²S amplifier · 1 W
IMU	BMI270 6-axis + BMM150 magnetometer
Light sensor	LTR-553ALS-WA proximity / ambient
Power / RTC	AXP2101 PMIC · BM8563 RTC
Battery	200 mAh LiPo
Storage	microSD slot
Ports	HY2.0-4P (PORT.A) · M5-BUS
USB	USB-C · OTG and Serial/JTAG
Dimensions	54.0 × 54.0 × 16.5 mm
Mass	54 g

U1M5Stack CoreS3 Lite

MCU	ESP32-S3 · Xtensa LX7 dual-core @ 240 MHz
Flash / PSRAM	16 MB / 8 MB
Display	2.0" IPS · 320 × 240 · ILI9342C
Touch	Capacitive · FT6336U
Camera	GC0308 · 0.3 MP
Microphone	ES7210 codec · dual input
Speaker	AW88298 I²S amplifier · 1 W
IMU	BMI270 6-axis + BMM150 magnetometer
Light sensor	LTR-553ALS-WA proximity / ambient
Power / RTC	AXP2101 PMIC · BM8563 RTC
Battery	200 mAh LiPo
Storage	microSD slot
Ports	HY2.0-4P (PORT.A) · M5-BUS
USB	USB-C · OTG and Serial/JTAG
Dimensions	54.0 × 54.0 × 16.5 mm
Mass	54 g

M1 · M2SCS0009 bus servo

Model	SCS0009 serial bus servo
Voltage	6 V
Torque	2.3 kg·cm
Travel	300°
Bus	RS485, addressable
Feedback	Position readback

Travel

How you build it

Four steps, one evening

In order, because the order matters — set the servo addresses before anything is bolted shut.

01
Set the servo IDs
Plug each servo into the FE-URT-1, give it an address, and centre it. Two minutes each, done once.
02
Build the neck
Both servos bolt into the printed brackets with the M2 and M3 fasteners. Pan on the bottom, tilt on top.
03
Wire the bus
Servos to the driver board, driver board to the controller, power supply to the rail. One pair of wires for both servos.
04
Flash it
Pull the Stack-chan firmware, build with the Moddable SDK, push it over USB-C. The face comes up and the head finds centre.

How a command reaches a servo

Questions

The things people ask first

Something not covered here? Write to us — a person answers.

Do I need a 3D printer?

No. The shell and the servo brackets are printed here and ship in the box. If you would rather print your own, the Stack-chan project publishes the models.

What is Pebble-chan, exactly?

It is our build kit, assembled around the open-source Stack-chan project and an M5Stack CoreS3 Lite. It is not the official M5Stack product — that is a different, pre-assembled device with its own hardware. The software is Stack-chan and we take no credit for it.

What do I write the software in?

Stack-chan runs on the Moddable SDK, so the behaviour is JavaScript. The controller is a stock CoreS3 Lite, so the Arduino core and M5Unified work as well if you prefer C++.

Does it need the internet to work?

No. The face, the motion and the sensors all run on the device. Wi-Fi is there for when you want to reach a speech or language API, and that choice is yours.

What do I need that is not in the box?

A USB-C cable and a computer to flash it. Nothing else.

When does it ship and when do I pay?

Kits dispatch within 1–2 weeks of your order being confirmed. Reserving costs nothing — you pay when we confirm your batch.

Reserve

Hold one from batch 01

Nothing is charged now. We email you when your kit is boxed, and you pay then.