This is my 3D‑printable version of the Whelen WS‑2000R, built to rotate and sound as close to the real thing as you can get with hobby‑grade parts. I modeled the housing, rotator, and proportions based on real WS‑2000R references, then designed the internals so everything fits cleanly with basic Arduino components.

To make mine functional, I used simple, inexpensive parts you can grab off Amazon. Here’s the exact setup I built it with:

• ELEGOO UNO R3 (main controller)

• 28BYJ‑48 stepper motor + ULN2003 driver board (for rotation)

• HiLetgo PAM8403 3W+3W amplifier (for boosting the audio)

• DWEII 3W 4‑ohm mini speakers (for the siren tones)

• Male‑to‑male Dupont jumper wires (for all the wiring)

• SNANSHI USB Type‑A to Type‑B cable (to program the Arduino)

• *Just copy and paste into amazon k?)

All the wiring is just plug‑and‑play with Dupont jumpers, and the whole electronics setup cost me around $40–55 total. The model prints in multiple pieces so the rotator, motor, and speaker all drop in without forcing anything or needing weird supports.

Once everything is assembled

, the head rotates smoothly using the 28BYJ‑48 motor, and the speaker + amp combo gives you clean electronic tones. It’s great as a display piece, a functional mini siren, or just a fun project if you’re into emergency warning systems.