Remember that brilliant idea you jotted down on a sticky note last week? No? That’s probably because it’s currently stuck to the bottom of your shoe or lost in the clutter of cables behind your desk because the glue wore off one fine day. Enter ESticky, a clever little gadget that’s bringing the humble Post-It into the digital age. This DIY project transforms a low-power e-paper display into a persistent digital notepad that keeps your thoughts, lists, and reminders visible without the battery-draining qualities of traditional screens. Unlike your phone that goes dark after 30 seconds, this little wonder stays on, displaying your information until you decide to change it.
Meet the ESticky, a project that recently popped up on Hackaday and has me questioning why we’re still living in the analog sticky note dark ages. This little gadget looks like someone shrunk down a Kindle and decided it should live permanently on your desk as your personal reminder system. The creator, who goes by gokux, basically took everything annoying about traditional sticky notes and solved it with a Seeed Studio XIAO ESP32C3 microcontroller, a battery, and a simple switch, all housed in a 3D-printed case you can hold in your palm.
Designer: Gokux
The device is built around a 2.9-inch e-paper display, the same kind of tech you’ll find in a Kindle or those price tags at fancy supermarkets that never seem to have their act together. The brains behind the operation is a tiny ESP32 microcontroller, which, for the non-hackers in the room, is like a little digital butler quietly handling your reminders. It runs off a rechargeable battery, so you can move it from fridge to desk to nightstand without hunting for a power cord. If you’re worried that some hacker wizardry is required, don’t be. The creator, affectionately known as gokux, documented the whole process on Instructables and made it about as approachable as building IKEA furniture – if you can follow a recipe or assemble a Billy bookcase, you can probably put together an ESticky.
Now, some purists might grumble, “But I want to write my notes by hand!” And sure, you can’t just scrawl on this thing with a pen. Instead, you type your note on a phone or computer and send it over, which honestly isn’t much different from texting yourself reminders or updating a Google Keep list. If you’ve ever written a sticky note and then spent the next ten minutes trying to decipher your own handwriting (“Was that ‘buy milk’ or ‘buy Mike’?”), you might even appreciate the legibility upgrade.
What really sells me on the whole idea is the e-paper display’s superpower: it only uses power when you change what’s displayed. So unlike your phone, which is always draining itself dry, ESticky can hang onto a single battery charge for ages. That means you can park it on your desk and actually see your reminders all day, every day, without worrying about charging it alongside your phone, tablet, smartwatch, and whatever else you’re using to stave off existential dread.
Of course, there’s one obvious limitation that the internet was quick to point out: you can’t just grab a pen and scribble on this thing like you would a real sticky note. You have to update it through your computer or phone, which means it’s not quite the instant brain-dump solution that made Post-its so addictive in the first place. But honestly? For planned reminders, project lists, or even just having your daily schedule staring at you from your desk, this seems like a pretty solid upgrade.
The instructions are available on Instructables for anyone brave enough to fire up a soldering iron, and I suspect we’re going to see a lot of variations on this theme in the coming months. Because once you see a solution this elegant to such an everyday problem, it’s hard to go back to paper squares that fall off and fade away. Sometimes the best innovations are just taking something we use every day and asking, “But what if it were better?”
The post This Hacker made a ‘Paperless Post-It’ using an E-paper display and $40 hardware first appeared on Yanko Design.