Posts

• Ultra Low-Spec Machine Learning: Estimating Heart Rate from Accelerometer Data — implementing heart rate estimation using only an accelerometer and fixed-point arithmetic [April 08, 2025]
• The robust universality of exponentially-weighted moving averages — The algorithm that scales from bytes to petabytes [April 05, 2025]
• What is Bit Angle Modulation? — The Secret to Efficient LED Control [March 31, 2025]
• Fast Vector Magnitude Approximation — Explaining the extreme efficiency of the alpha max plus beta min algorithm [March 26, 2025]
• A Random Number Generator in Only Three Lines of Assembly — How can a random number generator this simple actually work? [March 25, 2025]
• What is Pulse-Width Modulation (PWM)? — Pulse Width Modulation (PWM) is the standard for controlling LED brightness, in professional lighting as well as PCB art. [March 23, 2025]
• The Science of Gamma Correction — Why LED dimming needs to account for human perception [March 22, 2025]
• Zero-component switches: PCB resistive touch — Resistive PCB touch pads represent an elegant and cost-effective switch for low-cost PCB design [March 20, 2025]
• How a Differential Charge Pump Voltage Doubler Works — Driving a piezo 4x louder using simple components [March 19, 2025]
• Refactoring Skully for Bit Angle Modulation — Redesigning the LED modulation algorithm for a badge. [March 18, 2025]
• Building a low-cost badge that plays the Imperial March — Driving chiptunes with minimal power and code space. [March 17, 2025]
• Generating alt text using AI — Using AI to automatically create accessible image descriptions for Jekyll sites. [March 16, 2025]
• Optimizing Header Images with OpenCV Saliency Detection — Combining Python image processing with CSS to center images. [March 16, 2025]