[{"data":1,"prerenderedAt":273},["ShallowReactive",2],{"project-49478426":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":5,"maker":10,"posted_at":11,"year":12,"points":13,"comments":14,"rank_in_year":15,"shown_in_year":16,"top":17,"tier":18,"category":19,"subcategory":20,"format":19,"keywords":21,"reception":27,"sentiment":28,"stance_mix":29,"scored_comments":33,"aspects":34,"strip":42,"post_text":45,"what":46,"said":73,"maker_in_thread":141,"shape":150,"grid":154,"attempts":235,"same_week":236,"maker_shows":36,"maker_hidden":265,"reader_version":266,"card":267},"49478426","wilsonharper.net","NFC Energy-Harvesting PCB Business Card with an MCU","title","Show HN: NFC Energy-Harvesting PCB Business Card with an MCU","https:\u002F\u002Fwilsonharper.net\u002Fprojects\u002Fbusinesscard\u002F","WilsonHarper",1787924892,2026,231,30,220,4366,6,"notable","hardware","nfc business card",[22,23,24,25,26],"nfc","energy harvesting","pcb business card","mcu","nfc microcontroller","loved",0.432,{"positive":30,"neutral":31,"mixed":32,"critical":32},8,11,0,19,{"design":35,"idea":37,"pricing":38,"execution":39,"docs":41},{"positive":36,"critical":32},1,{"positive":32,"critical":32},{"positive":36,"critical":32},{"positive":40,"critical":32},2,{"positive":40,"critical":32},[43,43,32,43,32,43,32,43,43,32,43,43,32,43,44,32,44,44,32,44,32,43,44,32,44,32,32,43,44,44],3,5,null,{"problem":45,"audience":45,"pricing":47,"motivation":45,"time_to_build":45,"stack":54,"openness":70,"stage":71,"team_size":72},{"value":48,"source":49,"evidence":50},"About $8 per card for a run of 30","maker",[51],{"id":52,"by":10,"text":53},"49515225","The total came to roughly $150 for the cards and another $100 for shipping + import fees -- so roughly $8 each. That's more than I hoped, but the ENIG finish, 0.8mm thickness,…",[55,63],{"value":56,"source":57,"evidence":58},"NFC chip powering an MCU","commenter",[59],{"id":60,"by":61,"text":62},"49505161","jacquesm","What an incredibly neat hack, congratulations. In the 80's Motorola had a challenge-response system to open doors with badges that contained a good bit of circuitry that reminds…",{"value":64,"source":57,"evidence":65},"Open-source PCB, BOM and code on GitHub",[66],{"id":67,"by":68,"text":69},"49503114","chews","Really great project, thanks for sharing and what a well done write-up! Also kudos for including the PCB, BOM, and code on GH with a permissive license.","open_source","launched","unknown",{"praise":74,"objections":95,"requests":103,"questions":118,"alternatives":133},[75,87],{"value":76,"source":57,"evidence":77},"Neat hack and impressive engineering",[78,79,83],{"id":60,"by":61,"text":62},{"id":80,"by":81,"text":82},"49504038","Sorrel47","My wallet has enough NFC devices already trying to talk to each other. Still, a seriously neat piece of engineering!",{"id":84,"by":85,"text":86},"49502833","danshagen","cool project, especially as a bachelor student of EE!",{"value":88,"source":57,"evidence":89},"Well-written write-up and open-sourced files",[90,91],{"id":67,"by":68,"text":69},{"id":92,"by":93,"text":94},"49502671","thenthenthen","Nice write up!",[96],{"value":97,"source":57,"evidence":98},"Escrow and crypto use cases seem more complicated than current systems",[99],{"id":100,"by":101,"text":102},"49506846","altmanaltman","Okay so everytime I need escrow I will have to do all this? And use a different account anyway? Does not seem more convenient than current systems. Seems like you're trying to…",[104,111],{"value":105,"source":57,"evidence":106},"Cheaper cards in small packs with custom LEDs and printed designs",[107],{"id":108,"by":109,"text":110},"49503722","entrepy123","Really cool. I'd love to be able to order cheap ones in packs of 5 or 10, with custom led colors\u002Flocations\u002Fsizes\u002Fbrightness, fitting into a printed card...",{"value":112,"source":57,"evidence":113},"Audio playback via a piezo buzver",[114],{"id":115,"by":116,"text":117},"49503582","yegle","For future PCB business card ideas: it would be dope if it can play audios. Gemini says you can power a piezo buzzer (causing a small bump on a PCB) w\u002F NFC (just enough power to…",[119,126],{"value":120,"source":57,"evidence":121},"How the NFC power-harvesting physically works",[122],{"id":123,"by":124,"text":125},"49510211","rramadass","> I should explain how NFC works: Your phone emits a small magnetic field several times a second. An NFC card picks up on that field, making your phone act like a tiny wireless…",{"value":127,"source":57,"evidence":128},"Cost per card at different volumes",[129],{"id":130,"by":131,"text":132},"49506106","cowthulhu","I would be really interested to know the cost per card, both at the single card volume as well as the 30 the author ended up getting.",[134],{"value":135,"source":57,"evidence":136},"Hackaday business card MIDI keyboard",[137],{"id":138,"by":139,"text":140},"49508712","nielsole","Different idea: https:\u002F\u002Fhackaday.com\u002F2024\u002F06\u002F06\u002F2024-business-card-challenge-tiny-midi-keyboard\u002F",{"comments":44,"answered":32,"key":142},[143,144,147],{"id":52,"text":53},{"id":145,"text":146},"49515740","Thanks! Most datasheets seem a bit vague when it comes to listed power output, probably because conditions can vary so much between devices and environments.",{"id":148,"text":149},"49515724","Thank you, I appreciate it!",{"commenters":151,"max_depth":44,"maker_replies":44,"first_comment_mins":152,"lifespan_hours":153},23,3304,81,[155,159,163,167,169,171,173,176,178,179,181,183,186,188,191,193,195,197,200,202,206,208,212,215,217,218,221,225,229,233],[156,32,43,157,158,32],"49503448","project\u002Fneutral\u002Fdesign","badatnames",[160,36,43,161,162,32],"49503892","project\u002Fneutral\u002Fidea","adrianwaj",[164,36,32,165,166,32],"49504456","commenter\u002Fneutral\u002Fnone","HawtAds",[168,36,43,161,162,32],"49504907",[100,36,32,170,101,32],"commenter\u002Fcritical\u002Fnone",[172,36,43,161,162,32],"49507760",[174,36,32,165,175,32],"49509019","sokoloff",[177,36,43,161,162,32],"49510230",[115,40,43,161,116,32],[138,40,32,180,139,32],"other\u002Fneutral\u002Fnone",[130,43,43,182,131,32],"project\u002Fneutral\u002Fpricing",[184,43,43,182,185,32],"49509365","officialchicken",[52,43,32,187,10,36],"maker\u002Fneutral\u002Fpricing",[123,189,43,190,124,32],4,"project\u002Fneutral\u002Fnone",[60,44,44,192,61,32],"project\u002Fpositive\u002Fexecution",[145,44,32,194,10,36],"maker\u002Fneutral\u002Fdocs",[67,17,44,196,68,32],"maker\u002Fpositive\u002Fdocs",[84,198,44,199,85,32],7,"project\u002Fpositive\u002Fnone",[148,198,32,201,10,36],"maker\u002Fpositive\u002Fnone",[203,30,44,204,205,32],"49505323","project\u002Fpositive\u002Fdesign","k7peak",[207,30,32,201,10,36],"49515280",[209,210,43,161,211,32],"49504762",9,"m4rtink",[108,213,44,214,109,32],10,"project\u002Fpositive\u002Fpricing",[216,213,32,187,10,36],"49515261",[80,31,44,192,81,32],[219,31,32,165,220,32],"49504781","Neywiny",[222,223,32,180,224,32],"49512640",12,"sciencesama",[226,227,43,190,228,32],"49507563",13,"bimmpoke",[230,231,44,199,232,32],"49506918",14,"sohyeon",[92,234,44,196,93,32],15,[],[237,242,247,251,255,260],{"id":238,"name":239,"points":240,"category":241},"49461817","load-bearing",710,"ai",{"id":243,"name":244,"points":245,"category":246},"49489376","Laser Graffiti",253,"creative",{"id":248,"name":249,"points":250,"category":241},"49524447","slotstream",240,{"id":252,"name":253,"points":13,"category":254},"49471965","OpenTIE","games",{"id":256,"name":257,"points":258,"category":259},"49471407","Experiential",222,"dev_tools",{"id":261,"name":262,"points":263,"category":264},"49528895","Weedout",185,"consumer_social",false,"v2",{"id":268,"name":5,"line":6,"ai":265,"cat":19,"year":12,"points":13,"comments":14,"rec":27,"s":269,"top":17,"kw":270,"maker":10,"domain":5,"tier":18,"attempts":32,"strip":271,"url":9,"mix":272,"praise":76,"objection":97,"sub":20},49478426,0.43,[22,23,24,25,26],"330303033033035055050350500355",[30,31,32,32],1794036708965]