We compare the actuators that serve as a robot's "muscles" across three angles — the BLDC motor, the stepper motor, and the servo motor. These three aren't actually a parallel classification; motor construction (BLDC/stepper) and control architecture (servo) are two different axes that get conflated. Untangling that confusion, we trace the real torque/response/control tradeoffs from NASA's brush-wear-in-vacuum problem to the birth of Wiener's cybernetics.
September 2, 2026 Sensors & HardwareWhat determines a robot's or drone's range and safety isn't the motor or the sensor suite — it's the battery and its BMS (Battery Management System). From the electrochemistry of lithium-ion cells to cell balancing and protection circuits, we compare real specs from Molicel's high-discharge cells, DJI's intelligent flight batteries, and Samsung SDI's push into next-generation solid-state batteries — and look at what the Boeing 787 fire taught the industry about the limits of a BMS.
September 2, 2026 Sensors & HardwareWe compare the embedded computers that serve as a robot's "brain" across three design philosophies — the general-purpose SoC of the Raspberry Pi 5, the GPU-integrated AI computer of NVIDIA Jetson Orin, and the dedicated ASIC of Google Coral. From what the TOPS/W efficiency metric actually means, to why the newbot project chose a general-purpose SoC, to the real 2026 story of an AI-datacenter DRAM crunch hitting the hobbyist SBC market.
August 26, 2026 Technology TrendsVision-Language-Action folds camera input and natural-language instructions into a single model that outputs robot actions directly. From RT-2 to OpenVLA to Physical Intelligence's π0 lineage, surveying the spread of a design philosophy that refuses to separate perception from control.
August 10, 2026 Sensors & HardwareAn IMU pairs an accelerometer with a gyroscope to directly sense a vehicle's own translational acceleration and rotational rate. Unlike cameras or LiDAR, it depends on nothing external — but that self-containment comes with an inescapable fate: error accumulates over time (drift). We work through the MEMS gyroscope principle, Allan-variance noise analysis, the grading scale from consumer chips to navigation-grade modules, and Xsens's MTi series product strategy.
August 4, 2026 Sensors & HardwareActive stereo projects a pattern with an infrared emitter and does stereo matching; structured light reads depth from how a known pattern distorts; time-of-flight reads distance directly from a phase shift — three coexisting approaches to depth cameras. We look at the principles behind each and real examples from the Intel RealSense D435i, Microsoft Kinect, Orbbec Femto Bolt, and iPhone TrueDepth, and trace how Israeli startup PrimeSense's technology gave birth to Kinect, got acquired by Apple, and was reborn as Face ID.