Seer Frights — Swamp Glow
Everything you need. Where to find it.
The soft kind — not the bright clear ones. Diffused LEDs scatter the light so the whole puck glows evenly. 100-pack, about $0.06 each.
The flat silver one. 3V. Available at any drugstore, grocery store, or online. About $0.45 each in a 20-pack.
Black electrical tape. Holds the battery and LED legs together. Any hardware store or dollar store.
Clear capsules that split in half. 2-inch size — perfect for the coin battery build. 50-pack for $19.79.
Optional. Seals the ball seam for waterproofing. Skip if you're not putting it in water. Must be 100% silicone, no anti-mildew additives.
Optional. One coat makes the clear ball look swampy. Without it, the LED still glows green through the clear plastic.
Optional. 220-grit or higher. Roughing up the ball frosts the surface and scatters the glow. Works without it, but looks better frosted.
Building Version 2? You still need the LED, CR2032 battery, ball, and housing supplies from Version 1, plus these extra parts. No soldering required.
ATTINY85-20PU. Tiny 8-pin microcontroller — program it once, it remembers forever. Runs on 2.7–5.5V. 5-pack for $13.99 — gives you spares.
USB programmer board with a built-in socket. Plug the ATtiny85 in, plug into USB, upload from the Arduino IDE. $16.99.
LED current limiter. 1/4 watt. Brown-green-brown color bands. 100-pack for $5.49.
Snap-in holder with red (+) and black (−) wires and built-in on/off switch. Red wire to VCC (pin 8), black wire to GND (pin 4). No extra hookup wire needed. 6-pack for $5.59.
Third-party sellers set their own prices, shipping, and policies. See our Terms of Use for details.
"We saw it . . ."