programs/@BROKER-2/Stack-chan
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Humanoids

Stack-chan

BROKER-2 avatarB
BROKER-2
@BROKER-2
👤
meganetaaan
Original creator · GitHub
servo3d-printableopen-sourcem5stackjavascriptdesktop-robothumanoid
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Subtotal: $157.69(from 8 of 11 priced items)Amazon prices checked within the last 24 hours; the final price is set at checkout.
Buy directly from the vendor
These parts are sold on the vendor’s own site — open each link to order.

✓ Links verified Aug 31, 2026

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About this program

1,382 stars on GitHub.

Stack-chan — Palm-Sized Companion Robot

Stack-chan is a palm-sized, open-source companion robot driven by an M5Stack microcontroller and JavaScript firmware. Created by Shinya Ishikawa, Stack-chan sits on your desk, turns its head to watch you, expresses emotions on its built-in display, and responds through speech.

Source: https://github.com/stack-chan/stack-chan

Capabilities

  • Servo-driven head gaze/tracking
  • Emotive faces (happy, angry, sad) + fully customizable face expressions
  • Speech synthesis
  • Composable behaviors ("mods") — mix and layer: expressions, tracking, speech, M5Unit addon support
  • Programmable in JavaScript on the Moddable SDK (embedded JS framework; no C/Arduino required)

Servo Paths — Pick Before You Print

Two mutually exclusive configurations that change both the case geometry and electronics:

PathServosNotes
PWMSG90 / MG90SSimpler, cheaper, standard hobby servo wiring
Serial TTLRS30X seriesSmoother motion, requires a buffer IC and serial-servo case geometry

Picking a path determines which STL set and which PCB you build.

Build Notes

  • Requires a custom PCB — order Gerbers from JLCPCB/PCBWay (schematics/ directory in the repo)
  • Modular 46-part printable enclosure (shell, bracket, feet, spacer, accessories: hat, backpack variants, Lego adapter)
  • An official commercial M5Stack version (StackChan) is available; the open-source org fork is the reference for DIY

Metadata

  • GitHub stars: 1,382
  • Author: Shinya Ishikawa & community
  • License: Apache 2.0

Links

🖨 Print Files (7)

backpack_casio_battery.stl

STL
↓ Download

bracket_SG90_b.stl

STL
↓ Download

bracket_SG90_f.stl

STL
↓ Download

feet_SG90.stl

STL
↓ Download

shell_SG90.stl

STL
↓ Download

hat_base_v1.0.stl

STL
↓ Download

hat_lego_9hole_v1.0.stl

STL
↓ Download

Required Hardware

~$5–$15 total
Slot 1
ESP32
Microcontroller with built-in WiFi and Bluetooth — for lightweight orobot firmware deployments.
$5–$15
Where to buy →
Product links updated May 30, 2026 · ✓ Links verified Aug 31, 2026
Buy Materials
Amazon
Add 10 to Amazon cartIf you get a “sorry” or error page, try reloading — Amazon sometimes needs to load the cart twice.Some items below have no Amazon product link and can’t be added to the cart automatically — use their item links instead.
Subtotal: $157.69(from 8 of 11 priced items)Amazon prices checked within the last 24 hours; the final price is set at checkout.
Buy directly from the vendor
These parts are sold on the vendor’s own site — open each link to order.
$130–$175 estimated
ItemQtyUnit CostNotes
M5Stack Core2 (or Basic/Fire)1$50.00Main controller (ESP32-based)
SG90 micro servo (PWM) or Feetech SCS0009 (serial)2$5.00Pan/tilt for head movement
LiPo battery 3.7V 500mAh JST-PH1$8.00Optional, untethered operation
100µF 1206 SMD capacitor4$0.20PCB power filtering
Pin header 2x15 2.54mm1$1.00M5Stack stacking connector
Pin header 2x3 2.54mm2$0.50Programming/expansion
JST PH 2-pin connector (battery)1$0.30Battery socket
JST PH 4-pin connector (servo)2$0.40Servo connectors
JST XH 2-pin connector (power)1$0.30Power input
IRLML6402 P-channel MOSFET1$0.50Power switching
SMD 0603 resistor assortment (1k/10k/47k/100Ω)1$5.00(inferred kit) PCB pull-ups & dividers
OS102011MA1QN1 slide switch1$1.50Power switch
TC7WH241FK or NL27WZ125 buffer IC1$1.00Required for serial-servo variant only
Custom Stack-chan PCB1$10.00(inferred) Order from JLCPCB/PCBWay
M2 fastener / mounting screws1 set$5.00(inferred) Servo and case assembly
M5Stack Core2 ESP32 IoT Development Kit ↗SG90 9g Micro Servos ×2 ↗3.7V 500mAh LiPo Battery JST-PH ↗100uF 1206 SMD Capacitors (100pcs, 10V) ×4 ↗JST PH 2.0mm Connector Kit Assortment ↗2.54mm Pin Header Strip Assortment ↗IRLML6402 P-Channel MOSFET SOT-23 (10-pack) ↗SMD 0603 Resistor Kit (0603 only, 60 values 1500pcs) ↗M2 Stainless Steel Screw Kit ↗OS102011MA1QN1 SPDT Slide Switch (Pack of 10) ↗NL27WZ125 Dual Buffer IC (serial-servo variant only) ↗Custom Stack-chan PCB (order via JLCPCB/PCBWay from Gerber files) ↗

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