Double Pendulum Simulation vs Morse Code

In mathematics, in the area of dynamical systems, a double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system that exhibits rich dynamic behavior. The motion of a double pendulum is governed by a set of coupled ordinary differential equations. For certain energies its motion is chaotic. This application solves these differential equations using the Runge-Kutta method for the time stepping. You can influence the movement of the pendulum by holding your device in different positions.

Type Morse code anywhere with a simple two-key iPhone keyboard. Morse Keyboard turns dot-and-dash sequences into letters, numbers, punctuation, accents, and prosigns. Tap DOT and DASH, pause briefly, and the matching character appears in messages, notes, search fields, and other apps that support custom keyboards. TYPE WITH MORSE • Two large keys for fast, focused input • Automatic Morse code decoding • Shift, space, delete, and return controls • Classic and Liquid Glass keyboard styles • Optional haptic feedback LEARN MORSE CODE • Adaptive lessons that introduce letters gradually • Mnemonic illustrations, hints, and audio playback • Saved progress and letter mastery tracking • Word practice as your skills grow TRAIN YOUR EAR • Listen to Morse and identify each letter • Replay audio or reveal a hint when needed • Perfect the alphabet to unlock word listening REFERENCE EVERYTHING Browse and search letters, digits, punctuation, accented characters, and prosigns. View each Morse pattern, hear it aloud, and learn with memorable visual associations. PRIVATE BY DESIGN No accounts, tracking, or collected data. Learning progress stays on your device. Full Access is optional and enables keyboard haptics; without it, the keyboard uses the standard key click. Whether you are learning the Morse alphabet, practicing CW, exploring ham radio, or simply want a different way to type, Morse Keyboard puts the code at your fingertips.