RAW

Solution to the Water Jug Problem

Robert Eisele — Sun, 15 Feb 2026 12:13:54 +0100

Find the Parity of the Sum of floor(n/k) from k=1 to n

Robert Eisele — Tue, 03 Feb 2026 14:00:01 +0100

SSH Tunnel Cheat Sheet

Robert Eisele — Sun, 01 Feb 2026 14:31:41 +0100

Arduino PWM to 0-10 V Analog Signal Conversion for CNC and Spindle Control

Robert Eisele — Tue, 13 Jan 2026 15:56:57 +0100

Binary Search (done right)

Robert Eisele — Fri, 09 Jan 2026 10:27:02 +0100

Binary search is famous for its simplicity and for how often it is implemented incorrectly. A correct implementation follows from a precise specification, clear boundary semantics, explicit loop invariants, and a proof of termination. Special care is required for midpoint computation in fixed-width integer arithmetic to avoid overflow and subtle out-of-bounds failures.

Kinematics and Dynamics of a Rolling Shopping Cart

Robert Eisele — Mon, 22 Sep 2025 16:17:52 +0200

First-principles derivation of shopping-cart kinematics generalized to many wheeled robots

Introduction to Bloomfilters

Robert Eisele — Tue, 16 Sep 2025 18:39:08 +0200

Bloomfilters are probabilistic data structures for efficient set membership queries. This article derives the false positive probability from first principles, shows how to select the optimal number of hash functions, and examines the mathematical behavior of practical hashing algorithms. It also analyzes the effects of weak hashing on probe distributions and presents methods to mitigate them in Bloomfilter design.

Resistor Calculator – Calculate Values, Color Codes, and Combinations

Robert Eisele — Wed, 10 Sep 2025 14:29:20 +0200

The Resistor Calculator provides practical tools to determine resistor values, interpret resistor color codes, and calculate series or parallel resistor networks. Whether you are checking a single component or designing a circuit, the calculator helps you obtain precise values and clear results.

Inverse Kinematics of a 3-DOF Spider Robot Leg

Robert Eisele — Sun, 18 May 2025 10:22:55 +0200