LED Pumpkins
Materials
| Item | Use | Quantity | Price |
|---|---|---|---|
| ATtiny10 microcontroller | Main controller, one per pumpkin — runs the mode-select and LED PWM logic | 50 | $20.00 |
| Battery springs | Contacts for the 3D-printed 2xAA battery holder, 2 per unit | 100 | $10.40 |
| Orange 5mm diffused LEDs | Eyes and mouth glow, 3 per unit | 150 (from two 100-packs) | $17.16 |
| Slide switches (SPDT) | Two for mode selection, one for main power, per unit | 150 (from two 100-packs) | $20.00 |
| Resistors (3.3kΩ + 33Ω) | Transistor base resistor and LED current limiting | 100 (50 of each value) | $2.47 |
| Battery spade lugs | Connects the battery holder to the PCB | 50 (from two 25-packs) | $20.00 |
| 2N2222A NPN transistor (AliExpress) | Switches the LED bank off the ATtiny10's PWM pin, since the chip can't drive them directly | 50 | $1.32 |
| Custom PCB fabrication | The boards themselves, fish mascot silkscreen included | 1 batch order | $50.00 |
| Overture PLA filament | Pumpkin shell (51g) and battery holder (8g) per unit | ~2.95 kg total | $53.07 |
| Total | $194.42 | ||
* All prices are rough estimates at time of build and do not represent exact prices spent, due to bulk ordering and timing.
Tools Used
- Arduino IDE (ATtiny10 core)
- KiCad (custom PCB design)
- Blender (pumpkin shell and battery holder modeling)
- Cura (slicing)
- 3D printer
- Soldering iron and hot air rework station
- Magnifying loupe