Background: Humanoid robotics, which are designed for human appearance, are evolving rapidly and are increasingly used across various industries from manufacturing to domestic tasks. These robots have a metallic body with a motor-driven actuation. This architectural approach limits compliance, energy efficiency, and the seamless integration of subsystems that humans achieve naturally. We present a comprehensive, buildable technical framework for a biomimetic humanoid robot that replicates human anatomical, neurological, biomechanical, and thermoregulatory systems using commercially available components and accessible workshop materials. This architecture builds upon three systems previously published by the author. These include (1) PENTLLM1, a hybrid distributed intelligence system comprising specialized AI models coordinated by NEXUS, a central large language model; (2) MedAI v20.02, a clinical decision-support system that validates the multi-expert coordination approach applied here to robotic control; and (3) the DNA-inspired Coiled Chip Architecture3, a theoretical next-generation computing substrate that informs the design philosophy. Methodology: We have suggested an architecture which implements biomimicry across six hierarchical levels. At the first level, which is the computing substrate level, an NVIDIA Jetson AGX Orin (275 TOPS, 15-60W) is designed to serve as the central processor. This mirrors the human cortex’s role as a high-density integration hub. At the second level, which is intelligence level, PENTLLM distributes cognition across five specialized models (vision, audio, bilateral arm control, leg control, and trunk/neck coordination), unified by a locally running LLM. This is analogous to specialized brain regions integrated via the corpus callosum. At the third level, which is the skeletal level, 80 engineered structures replicate the functional biomechanics of the 206-bone human skeleton using wood, plastic, and copper. At the fourth level, which is the musculature level, we introduce the Integrated Musculotendinous Sensory Unit (IMSU). This is a novel three-tier actuator architecture derived from the physiology of the sarcomere. The IMSU unifies contractile actuation, elastic energy recovery, and distributed proprioceptive sensing within a single silicone-based substrate, replicating for the first time in a synthetic system the functional integration observed in the biological sarcomere. Its Tier 1 employs 233 agonist-antagonist functional groups (466 IMSU units) using standard dielectric elastomer actuators (DEAs) embedded in silicone. This replicates the actin-myosin sliding filament mechanism in which electrostatic Maxwell stress generates contractile force analogous to the cross-bridge power stroke. The Tier 2 enhances force density and passive return by embedding conductive springs within the silicone elastomer sheath, replicating the function of titin (the giant elastic protein that provides passive tension), resting muscle tone, and elastic energy recovery during the lengthening phase, while simultaneously providing coarse proprioceptive feedback through spring inductance changes functioning as a linear variable differential transformer. Finally, the Tier 3 introduces a leaf-venation electrode topology, in which conductive pathways branch fractally through the silicone substrate (replicating the transverse tubule and sarcoplasmic reticulum network that distributes excitation signals uniformly across the muscle fiber), achieving uniform field distribution, mechanical redundancy, and integrated fine proprioceptive sensing through distributed capacitance changes that mirror calcium-mediated regulatory feedback in vivo. The actuator architecture replicates skeletal muscle exclusively, as the smooth muscle and cardiac muscle functions of the biological body are replaced by mechanical equivalents that do not require contractile soft actuators. Actuator deployment follows a motor unit recruitment strategy informed by Henneman's size principle, in which NEXUS selectively activates only the DEA stacks required for a given load, optimizing energy expenditure across 233 agonist–antagonist pairs. At the fifth level, which is the nervous system, a three-level control hierarchy achieves reflex-arc latency below 1 ms via local Tier 3 capacitance-driven microcontroller loops, proprioceptive latency of approximately 15 ms via Tier 2 inductance-based position sensing processed on the Jetson Orin, and conscious action latency below 100 ms via NEXUS-coordinated PENTLLM reasoning. At the sixth level, which is the circulatory system, a closed-loop liquid cooling system transports heat from processors to the skin surface which is a replication of a human cardiovascular system for thermoregulation. We have provided mathematical models for structural mechanics, DEA physics, gravitational loading, power budgets, thermal dissipation, fluid dynamics, and control latency for each level. Results: The mathematical analysis confirmed the structural viability of major load-bearing elements with safety factors exceeding 90 times. The force output of the actuator matches human muscle equivalents across all three IMSU tiers. The analysis has further confirmed a mixed-use runtime of 19.6 hours on battery, control latencies of below 1 ms (reflex), approximately 15 ms (proprioception), and below 100 ms (conscious action). Computational analysis shows that Tier 1 DEA strips achieve a Maxwell stress of 0.127 MPa, placing them squarely within the functional range of human skeletal muscle (0.1–0.35 MPa). When bundled, a configuration of just four strips generates roughly 1020 N which effectively matches the raw power of a human quadriceps. Building on this foundation, the Tier 2 actuator utilizes a spring-embedded system to deliver even greater force density. The Tier 3 leaf-venation architecture provides simultaneous actuation and distributed tactile sensing enabling the robot to perceive contact location and pressure without dedicated external sensor arrays. It is important to note that there is no existing artificial muscle technology that combines contractile actuation, elastic return, and distributed proprioceptive sensing in a single unified substrate. The IMSU achieves this integration for the first time by faithfully replicating the functional architecture of the sarcomere. This design has prioritized buildability: Tiers 1 and 2 can be constructed in a standard workshop using commercially available materials, while Tier 3 is presented as an advanced configuration requiring further experimental validation. Conclusion: This paper has presented a comprehensive framework for a biomimetic humanoid robot achieving biological fidelity across six integrated system levels. Its principal contribution is the Integrated Musculotendinous Sensory Unit, a novel three-tier actuator grounded in sarcomere physiology. The Tier 1 DEAs replicate the actin–myosin power stroke, Tier 2 springs replicate titin-mediated elastic return, and Tier 3 leaf-venation electrodes replicate T-tubule excitation distribution with capacitance-based sensing. There is no existing artificial muscle technology that combines all three functions in a single substrate. The mathematical analysis confirms its structural viability (SF > 90×), actuator adequacy, power sufficiency (19.6 hours), and control feasibility (< 1 ms reflex, ~15 ms proprioceptive, < 100 ms conscious). The design prioritizes buildability using wood, plastic, copper, and commercially available components, enabling construction in a standard workshop without exotic fabrication. All specifications are provided for independent replication.
Muhammad Atif Waheed (Thu,) studied this question.