SunFounder PiSloth

$64.99 – $81.99

AvailableScriptedBudgetRaspberry PiMetal frameKit

≤ 1 weekShipping: In stock (DigiKey US).

LEARN MORE (SunFounder) ↗

Overview

A cheap, sturdy way to put a walking robot on a Raspberry Pi, best treated as a coding toy rather than a real biped.

A small Raspberry Pi biped with an aluminum alloy frame, two servos per leg and an ultrasonic "face". It walks, dances and avoids or follows objects, and SunFounder lists 22 preset actions such as Stomp, Swing and MoonWalk. The Robot HAT adds a speaker for sound effects and text-to-speech. It works like a Raspberry Pi version of Otto, with the Pi bringing Python and Wi-Fi control rather than better walking. A Raspberry Pi and two 18650 batteries (3.7 V, 3000 mAh or more recommended) must be bought separately, along with a charger unless the battery version is chosen. Its siblings PiDog and PiCar-X use the same Robot HAT family.

SunFounder's store shows both versions sold out, with no discontinuation notice. DigiKey US still stocks the kit, and SunFounder kept updating the Python code on GitHub into August 2026.

Type: Biped robot · Walks, but doesn't really balance
Maker: SunFounder (China)
Released: 2021
Price: $64.99 – $81.99
Status: Available
Best for: Ages 12+
Programming: Full SDK

Price and shipping

October 2026 check. SunFounder's own store lists the kit at $71.99 without battery and charger, or $81.99 with them (list price $89.99), but both versions show sold out there. DigiKey US sells the kit without battery for $64.99 and lists it as an active part. Raspberry Pi not included. Year based on the SunFounder store listing (May 2021), while the GitHub code repository dates from July 2020.

Shipping: In stock (DigiKey US). DigiKey US had 22 kits in stock at $64.99 in October 2026, with a 6-week manufacturer lead time for more. SunFounder's own store, which ships free from its China warehouse, shows the kit sold out. No Amazon US or RobotShop US listing was found. Raspberry Pi and batteries bought separately. DigiKey ↗

Specifications

Category	Bipeds · Walks, but doesn't really balance
Released	2021
Country	China
Availability	Available
Programmability	Full SDK
Built-in autonomy	Reactive · Responds to its surroundings without a map, such as avoiding obstacles or following a person
LLM support	Possible via SDK · No official LLM features. The Robot HAT speaker handles text-to-speech, and the open Python code runs on the Raspberry Pi, so an LLM can be added with custom code. A maker's "Super Nova" build did this with a ChatGPT-based voice assistant, featured by Raspberry Pi in July 2024. Raspberry Pi news ↗
MuJoCo simulation	None found · Nothing found.
NVIDIA Isaac simulation	None found · Nothing found.
Gazebo simulation	None found · Nothing found.
Best for	Ages 12+ (estimated)
Vision sensors	Sonar / ultrasonic
Actuators	Hobby servos
Audio	Speaker
Compute type	Raspberry Pi
Balance type	Scripted
Height	14 cm (12.5 × 10 × 14 cm)
Weight	Not published
Compute	Raspberry Pi 4B/3B+/3B/Zero 2W (not included) on SunFounder's Robot HAT. The Raspberry Pi 5 is not listed
Speed	Not published
DOF	4 hobby servos, 2 per leg (hip and ankle, unconfirmed), each turning -90° to 90°
Sensors	Ultrasonic distance sensor, Robot HAT speaker for text-to-speech and music, no camera or IMU
Balance	No balance control. Pre-set servo gaits shift weight over wide flat feet, much like Otto.
SDK	Ezblock Studio (blocks or Python, iOS/Android/Windows, with remote control), plus an open-source Python library on GitHub (GPL-2.0)

Common questions

How much does PiSloth cost?

PiSloth is listed at $64.99 – $81.99. October 2026 check. SunFounder's own store lists the kit at $71.99 without battery and charger, or $81.99 with them (list price $89.99), but both versions show sold out there. DigiKey US sells the kit without battery for $64.99 and lists it as an active part. Raspberry Pi not included. Year based on the SunFounder store listing (May 2021), while the GitHub code repository dates from July 2020.

Can PiSloth be bought today?

Yes, it is on sale. DigiKey US had 22 kits in stock at $64.99 in October 2026, with a 6-week manufacturer lead time for more. SunFounder's own store, which ships free from its China warehouse, shows the kit sold out. No Amazon US or RobotShop US listing was found. Raspberry Pi and batteries bought separately.

Who makes PiSloth?

PiSloth is made by SunFounder (China). It came out in 2021.

Can PiSloth be programmed?

Full SDK. Ezblock Studio (blocks or Python, iOS/Android/Windows, with remote control), plus an open-source Python library on GitHub (GPL-2.0).

Does PiSloth have AI chat or LLM support?

Possible via SDK. No official LLM features. The Robot HAT speaker handles text-to-speech, and the open Python code runs on the Raspberry Pi, so an LLM can be added with custom code. A maker's "Super Nova" build did this with a ChatGPT-based voice assistant, featured by Raspberry Pi in July 2024.