Engineering
Logic gates, bridge building, gears, and structural analysis
Quadcopter 2D (Pitch)
Side view: two rotors, PD on thrust split vs pitch — whiteboard quad slice.
Watt Governor (schematic)
Flyballs and sleeve vs RPM; steam throttle gap — speed feedback cartoon.
Logic Gate Simulator
AND, OR, NOT, NAND, XOR. Drag, drop, connect, see output.
Truth Table Generator
Build a circuit, auto-generate the truth table.
Bridge Builder
Place beams and joints. Apply load. See stress distribution.
Gear Train
Connect gears, adjust teeth count, see speed and torque ratios.
Planar Truss (triangle)
Symmetric 3-bar truss: bar forces and reactions vs span, height, and apex load.
PID Controller (1D)
Cart on a track: Kp, Ki, Kd and random velocity impulses toward set-point x = 0.
Four-Bar Linkage
Crank–rocker geometry with coupler-curve trace; link lengths and crank speed.
Cam & Follower
Eccentric circular cam and knife-edge follower: lift and estimated velocity.
Finite State Machine
Traffic-light Moore machine: timed green–yellow–red cycle or manual step; state graph.