Tag: #hardware

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• Cerebras Ultrafast and the Bottleneck in an Agent Loop — The Time 750 Tokens a Second Cannot Remove

  Cerebras and OpenAI announced an inference tier delivering up to 750 output tokens per second. The mechanism the announcement names is not compute but data movement, achieved by keeping weights in SRAM on the wafer. This

  2026-08-14 · 7 min read #llm#inference#hardware#latency#performance

• DRAM Address Scrambling and the Layer Beneath a Security Boundary — What Happens When the Fence Sits Above the Translation

  A research tool was published that reads the most hidden memory regions inside a CPU by perturbing address translation in the DRAM controller. The vulnerability is not in any cipher or permission check. It is in the layo

  2026-08-14 · 7 min read #security#hardware#memory#reverse-engineering#firmware

• The Exact Scope of the Phrase x86 Hardware Backdoor — Reading rosenbridge as Its Author Wrote It

  The repository title says hardware backdoors in x86 CPUs, but the body of the README states that the only thing believed to be affected is the VIA C3 and that later generations no longer carry the feature. In the disclai

  2026-08-09 · 9 min read #security#hardware#x86#cpu#fuzzing

• What a Robot Arm Is Made Of: Links, Joints, and What Actually Drives Them

  Buy six servos to build a robot arm and it almost always collapses under its own weight. This post starts from the precise definitions of link, joint, and end effector, explains what degrees of freedom actually count and

  2026-08-02 · 29 min read #robotics#hardware#electronics#arduino#math

• Forward Kinematics: From Joint Angles to End-Effector Position with Homogeneous Transforms and DH Parameters

  Forward kinematics is calculating where the end effector is when you know the joint angles. This post shows, with real numbers, how the 4x4 homogeneous transformation matrix resolves the mismatch between rotation (matrix

  2026-08-02 · 23 min read #robotics#math#electronics#raspberry-pi#hardware

• The Robot Arm Control Loop: From Trajectory Generation to PID and Gravity Compensation

  Everything past the point where inverse kinematics hands you joint angles belongs to control. This post explains, through discontinuous acceleration, why writing the target angle straight into the servo makes the arm jer

  2026-08-02 · 24 min read #robotics#electronics#arduino#hardware#math

• Inverse Kinematics: Working Backward from Where You Want to Be to the Joint Angles

  Forward kinematics is a single calculation — feed in angles, get a position. Inverse kinematics can have no solution, several solutions, or infinitely many. This post derives the analytic solution for a 2-link planar arm

  2026-08-02 · 22 min read #robotics#math#electronics#hardware#raspberry-pi

• Ohm's Law for Programmers: Understanding Voltage, Current, and Resistance in Numbers

  An Ohm's law guide for software engineers picking up an Arduino or Raspberry Pi for the first time. It redefines voltage not as a "quantity" but as a difference between two points, and pins down exactly where the water a

  2026-07-31 · 19 min read #electronics#arduino#circuit#hardware#maker

• Driving Motors, Relays, and Inductive Loads: Why You Should Never Power a Motor from GPIO

  A GPIO pin can supply tens of milliamps; a small DC motor demands hundreds. This post works through the accidents that gap causes, one by one. It covers using a separate power supply and why you must tie the grounds toge

  2026-07-31 · 23 min read #electronics#arduino#hardware#maker#iot

• Pull-Up, Pull-Down, and Floating Pins: Why a Single Button Is So Hard to Get Right

  Starts from why an input pin with nothing connected to it randomly flips between 0 and 1. Explains why a floating input behaves like an antenna, how pull-up and pull-down resistors solve that problem, and what the intern

  2026-07-31 · 20 min read #electronics#arduino#raspberry-pi#circuit#hardware

• 3.3V vs 5V and Level Shifting: Why Raspberry Pi GPIO Can't Survive 5V

  Wire a 5V sensor straight into a Raspberry Pi GPIO pin and the pin dies. This post starts from the definition of logic levels to explain exactly why. It covers what the VIH and VIL thresholds mean, why a 3.3V output is u

  2026-07-31 · 20 min read #electronics#raspberry-pi#arduino#hardware#iot

• LED Resistor Calculations Done Right: Why Every Color Needs a Different Value, and the E24 Series

  Starting from a diode's exponential current curve, this explains why an LED must always have a series resistor. It tables forward voltage by color, then works out real resistor values for both 5V and 3.3V supplies. It co

  2026-07-31 · 21 min read #electronics#arduino#circuit#hardware#raspberry-pi

• CXL Memory Tiering: How Far Has the Kernel Come — What DAMON Merged, and What the Numbers Didn't Measure

  Even when CXL hardware is plugged into a server, it's the kernel that actually decides which pages are hot and which are cold and moves them. As of July 2026, Linux mainline has received DAMON/DAMOS-based tiering pieces

  2026-07-16 · 19 min read #hardware#cxl#memory#linux-kernel#performance

• QuadRF and Software-Defined Radio — What "Seeing WiFi Through a Wall" Really Means

  QuadRF, featured by Jeff Geerling, is a development kit that stacks a 4×4 MIMO software-defined radio and a phased-array antenna on a Raspberry Pi 5. The provocative headline — "see WiFi through my wall" — is not X-ray v

  2026-07-11 · 6 min read #sdr#rf#radio#raspberry-pi#hardware

• Reviving Retired DDR4 — Meta's CXL Bridge Chip, Vistara

  DDR5 prices keep rising while perfectly good DDR4 from retired servers piles up in the warehouse. Meta's Vistara, presented at ISCA 2026, is a custom CXL bridge chip that revives that old DDR4 inside modern DDR5 servers

  2026-07-11 · 7 min read #cxl#infrastructure#memory#hardware#sustainability

• FingerScore Hardware 6 — PCB Design and Miniaturization (Building It Into a Ring)

  We cover the final step that turns the FingerScore circuit into a real, touchable ring: PCB design. The schematic-to-PCB flow, component placement and routing, ring form-factor constraints, 2.4GHz antenna layout, DFM and

  2026-06-17 · 15 min read #fingerscore#pcb#kicad#antenna#miniaturization

• FingerScore Hardware 2 — Electronics Fundamentals (From Voltage, Current, and Resistance to Digital Signals)

  Everything you need from electronics fundamentals to build the FingerScore ring device, in one piece. We walk through Ohm law and voltage dividers, pull-up and pull-down resistors, capacitors, LED current-limiting calcul

  2026-06-17 · 23 min read #fingerscore#electronics#hardware#gpio#i2c

• FingerScore Hardware 5 — Power, Battery, and Circuit Design

  We cover, from scratch, the power design that actually keeps the FingerScore ring on. A power budget calculation, coin cell vs. LiPo, charging ICs and protection circuits, LDOs and buck converters, decoupling, low-power

  2026-06-17 · 16 min read #fingerscore#power#battery#lipo#circuit

• Building FingerScore Hardware 1 — System Design and Bill of Materials (BOM)

  This is part one of a hardware series on building the FingerScore ring-shaped score recorder yourself. It walks through translating product requirements into circuits, the system block diagram from sensor to MCU to radio

  2026-06-17 · 29 min read #fingerscore#hardware#electronics#ble#embedded

• Making Inference Fast — Quantization, Sparsity, and Dataflow from a Hardware Lens

  We break down the cost structure of inference through the memory-wall lens, then connect quantization (INT8/FP8/FP4), structured sparsity (2:4), dataflow architectures, operator fusion, batching and KV caching into one p

  2026-06-16 · 18 min read #inference#quantization#sparsity#dataflow#gpu