The Missing Link Between Your Robot and the Real World.Built so physical AI systems can sense, react, and move reliably, from prototype to production. We engineer ultra-precise, low-latency hardware designed to handle the intense, real-time computational demands of next-generation intelligent machines.EtherCAT Communication Boards: Ultra-low latency, deterministic communication interfaces that ensure seamless, real-time synchronization across your entire robotic architecture.H4 Lab designs and builds advanced electronics for robotics and physical AI, from early-stage prototyping to production-ready hardware. We work with startups, research labs, and system integrators who need deep technical expertise and fast execution.Deterministic, production-ready firmware for motor control, multi-sensor fusion, real-time communications, and safety-critical applications, written to IEC 61508 standards where it counts.Custom EtherCAT devices, Distributed Clock synchronization, and multi-axis topologies across 20+ joints. We've debugged the edge cases most teams never see coming.H4 Lab is a Montréal-based hardware engineering company building certified embedded subsystems for humanoid robots and physical AI systems. We design the sensing, communication, and safety-critical electronics that robotic platforms depend onWe started building this hardware because we needed it ourselves and it didn't exist. That's still the standard we design to.We focus on EtherCAT and specialize in designing compact, cost-efficient sensing and communication hardware for robotics. We achieve this by leveraging the latest advances in motor control and inertial sensing silicon, combined with deep expertise in electrical and firmware engineering. Our products are built around open industrial standards like EtherCAT and FSoE, enabling deterministic real-time control and functional safety in demanding physical AI systems.H4 Lab grew out of a frustration shared by anyone who has actually tried to build a humanoid robot: the hardware you need doesn't exist off the shelf.Our team brings together backgrounds in automotive functional safety, university robotics research, and hands-on humanoid development. Working with a dozen early-stage robotics companies who needed to iterate fast, we saw the same gaps appear over and over, and built the products to fill them.