6 DIY gifts for Valentine's Day

For all the nerdy sweeties out there

Homemade candy hearts
Homemade candy hearts
Personalized candy hearts? Sure, if you like the taste of chalk. But there are far nerdier DIY projects you can try.Jennifer Wold via Instructables

This Valentine's Day, show your affection with a gift you make yourself. You could mix up a tasty treat, such as these personalized candy hearts, but pretty much anyone can do that. Instead, choose a love-themed project that demonstrates your science savvy, your DIY chops—or both.

Geeky cards
A Geeky Card
If you'd like to keep it simple, print out the geekiest Valentine's Day cards you can find. These physics cards are a good start, or you could go with a photo of Pluto's heart. Difficulty: One out of five heartsSymmetry
Geekier light-up card
A Geekier Card
A geeky card is all well and good, but what about one to demonstrate that your love is electric? This DIY card uses conductive ink to power a light-up robot. Cute and affectionate, the love-bot should earn a glowing review. Difficulty: Three out of five heartsDan Bracaglia
Bath bombs
Bath Bombs
If you want to pamper your significant other, a romantic bubble bath should do the trick. Bring it to the next level with these homemade bath bombs. Best of all, the recipe makes about 12 chunks of sweet-scented fizzy goodness—so you can save the leftovers for your own time in the tub. Difficulty: Two out of five heartsLush via Giphy
Wear your heart (monitor) on your sleeve
Wear Your Heart (Monitor) On Your Sleeve
For a wearable token of your affection, try this electronics project. By connecting a cardiac monitor to a set of red LEDs, you can create a heart-shaped pattern that flashes brightly with the wearer's every heart beat. Difficulty: Four out of five heartsBrian Klutch
Put a blinky ring on it
Put A Blinky Ring On It
In 2015, engineer Andrew Martin used LEDs to create a ring that can blink out any date. He got the idea from a fictional engagement ring that flashed the date that the groom and bride met. You don't need to use a marriage proposal as an excuse to hack together your own blinky ring—it works as a Valentine's gift, too. Difficulty: Three out of five heartsJanet Jay
Real ring
Go All-In With A DIY Engagement Ring
Novelty rings are sweet. But if you actually plan to pop the question on Valentine's Day—and you want to make the ring yourself—you'll need to consult with a professional. That's what Popular Science contributing editor Mike Haney did: He forged an engagement ring for his then-girlfriend with help from jewelry maker Sam Abbay. Difficulty: Five out of five heartsSam Abbay