![]() ![]() The first HP ink cartridge had twelve of these nozzles, which is easy enough to control directly from a computer or microcontroller. When current is applied to that heating element, the ink literally boils (yep, that’s where the trademark ‘Bubblejet’ came from) and squirts out the nozzle onto a piece of paper. Right beside those holes, there’s a small heating element. Inside each inkjet cartridge, there’s a reservoir of ink, and a series of tiny holes. There’s a reason inkjet cartridges cost more than the printer itself. On the printer carriage itself, there’s an encoder, but the real story here is in the ink cartridge itself. There’s some interesting hardware in this cheap printer - an ARM processor that might run Linux, there’s a big ‘ol serial Flash chip with all the code completely unencrypted, and there’s a serial port that spits out debugging info. This hack began by buying a simple HP inkjet printer from China for $28 USD. The schematic for the first inkjet cartridge Sprite’s doing something different, and he’s turning his inkjet into a Magic Paintbrush. No problem, because you can just buy an inkjet printer and make your own art. Sprite is very accomplished in making PCB art and DaveCAD drawings, but actual art is something that’s been out of reach. This time, though, Sprite is tapping into his artistic side. Sprite was back at this year’s Superconference, and again he’s bringing out the big guns with awesome hardware hacks. In short, if you’re looking for someone who’s building the coolest, most technical thing of sometimes questionable utility, you need look no further than Sprite_tm. He’s installed Linux on a hard drive, and created a Matrix of virtualized Tamagotchis. Sprite’s now working for Espressif, makers of the fantastic ESP8266 and ESP32, where he created a miniature Game Boy and turned this PocketSprite into a real product. ![]() When it comes to hackers we love, there’s no better example than Jeroen Domburg, a.k.a. ![]()
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