2023 Halloween Hackfest: Candy Basket Sees You Coming

Halloween has a long-standing tradition of two kinds of visitors: adorable superheroes with pillowcases, and
teenagers with the suspicious confidence of someone who believes “take one” is a negotiable suggestion.
If you’ve ever left a candy bowl outside your door, you already know the emotional arc:
optimism → hope → why is the bowl empty at 6:11 p.m.?

Enter the kind of solution only a maker community would build: a candy basket that doesn’t just sit there
looking generousit reacts. The “Candy Basket Sees You Coming” project from the 2023 Halloween
Hackfest turns a cheap Halloween candy bucket into a porch prop with presence detection and a clear, visual
“you may approach” signal. It doesn’t scold. It doesn’t lecture. It just glows with the quiet authority of a
bouncer at a club called Snickers & Chill.

What Is the 2023 Halloween Hackfest (and Why It Fits Halloween So Well)

Hackfests and Halloween are basically cousins. Both encourage creativity, playful mischief, and the occasional
late-night hot-glue emergency. The 2023 Halloween Hackfest celebrated the most hacker-friendly holiday of the year:
costumes, props, candy delivery contraptions, and clever electronics that make the neighborhood kids go,
“Whoahow’d you do that?”

The “Candy Basket Sees You Coming” entry is a great example of the Hackfest spirit: take something ordinary,
add sensors and lights, and suddenly your porch has interactivity. It’s not just decoration anymoreit’s
an experience. And in a world where attention spans are shorter than a fun-size Twix, interactive wins.

Meet the Candy Basket That “Sees” You

The core idea is simple: detect a person approaching the candy bowl, then communicate in the universal language
of “safe to proceed” colors. When someone is detected at a distance, the basket shows one color (think:
“I see you”). As they move closer, it switches to another (think: “Okay, now you can grab candy”). It’s
friendly, immediate, and works even if your doorbell is ignored because your favorite show is at the good part.

Instead of using a camera or a basic motion sensor, this build uses a compact millimeter-wave radar presence
sensor (commonly used for occupancy or presence detection) paired with an RP2040 microcontroller. Translation:
it can notice a person more intelligently than a “something moved somewhere” detectorand it can do it without
recording faces or saving footage. That’s a big win for privacy and simplicity.

Why “Seeing You Coming” Is the Perfect Halloween Vibe

Halloween is basically theater. You’re staging a tiny one-night-only production on your porch. The best props
don’t just existthey respond. This candy basket becomes a mini “checkpoint” moment: kids approach,
the light changes, and suddenly the act of taking candy feels like a ritual instead of a raid.

How It Works: Radar + RP2040 + Light That Makes Sense

At a high level, the build combines three parts:

• Presence detection: a radar-based presence sensor detects someone nearby and estimates distance zones.
• Decision-making: the RP2040 reads sensor data and decides which “state” to display (far/near, waiting/ready).
• Feedback: an addressable LED (or LED setup) drives a light pipe or glow effect that clearly communicates status.

The magic is in the user experience: you’re not dumping a rainbow light show on the porch for no reason. You’re
using lighting as communication. Orange (or a “warning/notice” tone) at detection, green at close range.
That’s intuitive even for a five-year-old in a dinosaur suit whose tail is already knocking over your pumpkins.

Why RP2040 Is a Great Brain for a Porch Prop

The RP2040 is popular in maker projects because it’s fast, affordable, and flexible for real-time input/output
jobs like thisreading a sensor and updating LEDs instantly. It’s also happy running lightweight logic without
needing a full computer on your porch. In other words: it’s powerful enough to be responsive, but not so complex
that a single loose Wi-Fi password ruins Halloween.

Why Radar Presence Sensing Beats “Simple Motion” for Candy Duty

A lot of Halloween builds start with PIR motion sensors because they’re common and cheap. PIR can work greatbut
presence radar has some advantages for “porch interaction”:

• More consistent detection: radar presence sensing can be less picky about “heat signature + motion.”
• Distance zones: many modules provide configurable distance gates (so you can trigger different actions as someone approaches).
• Less false drama: you can tune it so your basket doesn’t “react” to every passing car, wind gust, or decorative skeleton doing a slow flop.

That tuning point matters. A candy basket should be responsive, not chaotic. If the lights constantly change
with every sidewalk passerby, the effect stops being spooky-fun and starts being “broken Halloween Roomba.”

Make It Delightful: Design Choices That Actually Matter

The best Halloween hacks aren’t the ones with the most partsthey’re the ones with the best moments.
This project nails a few design choices that are worth copying:

1) A Clear “Approach Signal”

The color shift is a simple, universal cue. You don’t need instructions. You don’t need a sign. The basket’s
glow tells you what to do. That’s excellent UX: less reading, more candy.

2) Light Pipe / Glow That Looks “Built-In,” Not “Bolted On”

Halloween props look best when the tech disappears into the vibe. A light pipe or diffused glow feels like part
of the basket, not like an LED taped on in a panic at 4:58 p.m. (No judgment. We’ve all lived there.)

3) No Camera Required

Using presence sensing instead of a camera keeps the build friendlier and less invasive. It’s also easier to
deploy: no worrying about lighting conditions, no fiddling with image processing, and no awkward questions from
neighbors about whether your candy bucket is running facial recognition like a tiny plastic surveillance state.

Upgrades That Keep It Fun (Without Turning It Into a Maintenance Nightmare)

The original concept is intentionally minimal: detect, glow, invite. If you want to “level up,” the best add-ons
are ones that deepen the experience without multiplying failure points.

Audio: The “Witch Cackle” Upgrade

A short sound effect can be hilariousespecially if it’s triggered only when someone reaches the “green zone.”
Keep audio short, not startling, and consider volume limits so your basket doesn’t become the neighborhood’s
accidental 2 a.m. jump-scare machine.

Accessibility: Make the Signal Work for Everyone

Color cues are great, but not everyone perceives color the same way. Consider adding:

• Brightness changes (dim at far range, brighter at near range)
• Pattern changes (slow pulse vs steady glow)
• Simple icons (a small “OK” light, or a clear symbol) if you’re building a fancier display

“Take One” ReinforcementWithout Becoming a Hall Monitor

Here’s the truth: you can’t completely engineer away human nature. But you can nudge behavior. The basket can
encourage fairness by making the “ready” state feel like permission. Pair it with a friendly sign:
“Green light = grab one!” It’s not foolproofbut it’s surprisingly effective, especially with younger kids and
families who want to do the right thing.

Safety and Porch Practicality: Don’t Let Your Hack Become the Scariest Thing Outside

Halloween safety is mostly not about “poisoned candy myths.” It’s about the basics: visibility, fire safety,
trip hazards, and traffic. If you’re building a tech candy prop, keep these realities in the design loop:

Fire Safety: Candles and Costumes Don’t Mix Well

Battery-operated candles and glow sticks can create the same ambiance with fewer risks. If you decorate with
lights, keep cords tidy and pathways clear. A tech candy basket is cuteuntil someone trips over your power bank
cable and your pumpkins achieve lift-off.

Traffic Safety: The Real Halloween Threat Is the Road

Halloween evenings bring more pedestrians (often excited, often distracted, often in dark costumes). If your
basket draws kids closer to the curb or encourages crowding near the street, reposition it. Put the candy station
back from traffic, on a stable surface, with clear walking space.

Food and Candy Safety: Simple Checks, Big Peace of Mind

If you’re leaving candy out, individually wrapped treats are the simplest choice. For families, standard advice
still holds: inspect packaging before eating, and be mindful of allergies. If you want to be a Halloween hero,
set out a small, clearly labeled non-food option too (stickers or tiny toys), and make sure anything small is
appropriate for the crowd in your area.

Privacy and “Not Being Weird” (A Surprisingly Important Section)

Halloween props should be spooky, not creepy-in-a-neighborhood-meeting way. If you use sensors:

• Avoid recording (especially video/audio) unless it’s truly necessary and clearly disclosed.
• Keep data local (no cloud accounts required to hand out candy).
• Be transparent with a small sign if your setup could be misunderstood.

A radar presence sensor that simply triggers lights is about as “friendly tech” as it gets. It adds magic without
collecting personal info, which is the ideal Halloween balance.

Trick-or-Treat Etiquette: Your Basket Can Set the Tone

Good etiquette makes Halloween better for everyone. The candy basket project is basically etiquette with LEDs:
it creates a moment of turn-taking. A few extra touches can reinforce that vibe:

• Skip houses with lights off (and if you’re the house, turn lights on if you’re participating).
• Avoid crowding the doorwaydesign the candy station so lines form naturally.
• Use friendly prompts like “Please take one” and “Happy Halloween!”

Bottom Line: A Small Build That Makes Halloween Feel More Alive

The “Candy Basket Sees You Coming” project is a reminder that the best holiday hacks don’t need to be complicated.
Halloween is about delight: a little surprise, a little performance, and a lot of sugar. A presence-detecting,
color-signaling candy basket adds interactivity without adding chaos. It’s practical, fun, and just spooky enough
to feel like your porch joined the party.

And if nothing else, it offers a comforting truth: even if the candy disappears too fast, at least it vanished
under dramatic lighting.

Hackfest Porch Notes: of Real-World “Candy Basket” Experiences

If you’ve never hosted trick-or-treaters, here’s the first surprise: Halloween traffic doesn’t arrive like a
polite scheduleit arrives like a wave. You’ll get long quiet stretches where your candy basket sits there,
glowing bravely into the darkness, and then suddenly a cluster of kids appears like they spawned from a fog
machine. That’s where a “sees-you-coming” signal shines (literally): it creates a clear, shared momentapproach,
wait for the cue, take candy, move on. When the system is simple and predictable, people naturally cooperate.

One common experience with porch builds is realizing that the “real environment” is a prankster. The temperature
drops, the wind picks up, and suddenly the thing that worked perfectly inside your house develops opinions.
Batteries behave differently in cold weather, adhesives lose their confidence, and anything lightweight becomes
a candidate for “unexpected flight.” That’s why the most successful candy basket builds tend to prioritize
mechanical stability first: a sturdy base, a secure enclosure for electronics, and cables routed
so they’re not trip hazards. Halloween is not the night you want to learn what “strain relief” means.

Another classic porch moment: kids come in every size. A sensor setup that’s perfect for adults can miss a toddler
who approaches at a lower height, or it can trigger early for tall teenagers walking past on the sidewalk. Makers
often end up tuning their detection zones based on the “actual crowd” they see in the first 20 minutes.
The best approach is usually to aim for a forgiving range: detect someone in the general porch area, then confirm
“close enough for candy” only when they’re right at the basket. That two-step approach reduces flicker and
makes the interaction feel intentional.

There’s also the social side. A glowing, responsive candy basket becomes a tiny stage prop, and people react
accordingly. Little kids tend to pause and stare (excellent), older kids try to “test” it (also fine), and adults
usually smile because it looks like someone cared enough to make Halloween a bit more special. If you add sound,
the shared wisdom is to keep it short and warmfunny spooky, not genuinely frightening. The goal is giggles,
not tears. And if you’re using bright LEDs, you’ll quickly learn that “too bright” can wash out the vibe.
A soft glow reads as magical; a blinding beam reads as “airport runway, now boarding for KitKat.”

Finally, there’s the candy reality check: no technology fully prevents the occasional “handful grab.”
The healthiest Halloween mindset is to treat your basket as an experience, not an inventory system.
If the candy runs out early, you still gave the neighborhood a fun moment. If you want to reduce the odds of a
candy wipeout, the most effective “upgrade” is surprisingly low-tech: refill in smaller batches, keep an eye on
the porch when you can, and use clear signage. The lights help, the vibe helps, and the community energy usually
does the rest. Halloween is a short holidaymake it memorable, not stressful.