Torch (LED Flashlight) 🔦
The classic first electronics project — a working LED flashlight with a complete 3D enclosure design.
Circuit
Battery (4.5V) → Switch → Resistor (100Ω) → White LED → Ground
Current calculation:
I = (V_battery − V_led) / R
I = (4.5V − 3V) / 100Ω
I = 15mA ✓ (safe for 20mA max LED)
3D Design
The enclosure uses several primitives:
| Part | Shape | Purpose |
|---|---|---|
| Body | Tube | Hollow cylinder for grip, holds battery |
| Head | Cylinder | Wider section that holds reflector |
| Reflector | Cone | Chrome finish, focuses light into a beam |
| Lens | Dome | Transparent glass cover |
| Button | Capsule | Ergonomic power switch |
| Battery | Cylinder | AA cell inside body (visible through semi-transparent wall) |
| LED | Sphere | Light source at focal point |
| Resistor | Cylinder | Current limiter, hidden inside body |
Component Placement
- Battery — Centered in the handle section (y = -1.0)
- Switch — Connected to the yellow button on the side (y = 0.5)
- Resistor — Hidden inside the upper body (y = 1.5)
- LED — At the focal point of the reflector (y = 3.6)
- Wires — Routed along the inside of the body
Try It
- 2D tab: Click the switch to turn on the LED
- 3D tab: Orbit around to see the full torch design
- Fork: Make your own version with different colors or shapes
Fork Ideas
- Add a second LED for more brightness
- Change to 9V battery + 220Ω resistor
- Add a torus ring for a lanyard loop
- Make the body fully transparent to see all internals
- Change colors to match your favorite flashlight
Every new ExoSynk account gets their own copy of this project. Fork this one to remix it!