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School students build world’s smallest humanoid robot — 5.5 inches tall


Four members of the robotics team at Diocesan Boys’ School in Hong Kong have achieved a remarkable engineering achievement. They successfully created the world’s smallest humanoid robot, breaking the record set by Pakistan’s Zain Ahmed Qureshi in 2022.

The robot is only 141 mm (5.55 inches) tall, which is 11.3 mm (0.44 inches) shorter than a standard ball pen. The innovative team behind this creation includes students Aaron Ho Yat Fung, Isaac Zachary To, Justin Wang Tou Duong and Ngo Hei Leung.

Guinness World Records officially recognized the team’s humanoid robot, with the creation featured in an episode of its YouTube series Record Weekly.

amazing feat

In the pursuit of the world’s smallest humanoid robot record, students at Diocesan Boys’ School had to ensure their creation had an extraordinary range of articulation. This requires enabling the robot to articulate its shoulders, elbows, knees and hips, while also mastering bipedal locomotion.

The journey begins with the students using computer-aided design (CAD) to carefully craft blueprints of their miniature wonders. After finalizing the technical specifications and necessary components, they hired the expertise of a factory to manufacture a servo motor suitable for their requirements.

These servo motors, often called “servos,” play a key role in the robot’s functionality. They facilitate precise rotation and movement, allowing the robot to skillfully manipulate its limbs. To coordinate the synchronization of these complex components, the team purchased a 16-channel servo control board. They supplemented this with a range of hardware essentials, from screws and nuts to wires and batteries, according to Guinness.

Students crafted the robot’s acrylic panels and 3D-printed components in the school’s robotics lab. According to the team, the combination of cutting-edge technology and innovative design resulted in a truly remarkable robotic marvel.

Comprehensive project

After sourcing all the necessary components, the students assembled their robots. They started the process by building the legs, using eight servos to facilitate movement of the feet, knees and hips to demonstrate the robot’s bipedal capabilities.

Attention then shifted to the assembly of the arms, using servos to reach the shoulder and elbow joints. At the same time, the team tested the positioning of the battery and control board. Initially, the battery cells they selected proved insufficient for the robot’s size, prompting them to switch to more compact 7.4V lithium-ion batteries.

The control board is then fixed to the robot’s back area, allowing it to be manipulated via the onboard controller. In addition, according to Guinness, students also integrated mobile applications bundled with the servo control board, allowing them to perform pre-programmed movements.

In addition to setting world records, students view the robot as a multifaceted educational tool. It is designed to be compact, affordable, rechargeable and programmable specifically for deployment in STEAM (Science, Technology, Engineering, Arts and Mathematics) educational workshops. The team said the measure targets minorities and economically disadvantaged families and is intended to promote inclusivity and accessibility in technical education.

In order to advance the goal of STEAM education, the team also plans to make the robot’s design and programming code available for free as open source.

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About editing

Jijo Malayir Jijo is an automotive and business journalist based in India. He holds a BA (Hons) in History from St. Stephen’s College, Delhi University and a PG Diploma in Journalism from the Indian Institute of Mass Communication, Delhi, and has worked in news agencies, national newspapers and automotive magazines. In his spare time, he enjoys off-roading, political speaking, traveling, and teaching languages.



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