[{"data":1,"prerenderedAt":508},["ShallowReactive",2],{"project-28901214":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":20,"keywords":22,"reception":28,"sentiment":29,"stance_mix":30,"scored_comments":35,"aspects":36,"strip":46,"post_text":47,"what":48,"said":88,"maker_in_thread":197,"shape":209,"grid":213,"attempts":469,"same_week":470,"maker_shows":43,"maker_hidden":500,"reader_version":501,"card":502},"28901214","SurfSonar","A sonar into my surfboard","title","Show HN: I built a sonar into my surfboard","https:\u002F\u002Ffoobarbecue.github.io\u002Fsurfsonar\u002F","foobarbecue.github.io","foobarbecue",1634518838,2021,332,91,102,2533,5,"legend","hardware","surfboard sonar sensor",[23,24,25,26,27],"sonar","surfboard","echosounder","surf conditions","raspberry pi","curious",0.078,{"positive":31,"neutral":32,"mixed":33,"critical":34},11,23,2,8,44,{"idea":37,"design":40,"performance":42,"docs":44,"pricing":45},{"positive":38,"critical":39},6,3,{"positive":41,"critical":33},0,{"positive":33,"critical":43},1,{"positive":41,"critical":41},{"positive":41,"critical":33},[41,18,18,41,41,41,41,41,41,18,39,43,18,39,39,39,18,39,39,43,39,43,41,39,41,39,18,39,39,41,43,39,39,39,18,43,33,41,18,18],null,{"problem":49,"audience":64,"pricing":47,"motivation":72,"time_to_build":47,"stack":76,"openness":85,"stage":86,"team_size":87},{"value":50,"source":51,"evidence":52},"Detecting wave sets and water depth while paddling out, to read surf conditions.","inferred",[53,57,61],{"id":54,"by":55,"text":56},"28901833","QuadrupleA","As a surfer at crowded breaks, I've often thought it would be cool to build a little drone submarine early warning system - it would navigate itself out a half mile or so…",{"id":58,"by":59,"text":60},"28907145","consumer451","Super cool project! At first I was thinking how hard it must to get value from the confidence reading in real-time. But I was imagining looking at readings while riding a wave.…",{"id":62,"by":11,"text":63},"28912492","OP here. Thanks so much for the fun discussion. A few things: 1. I forgot to set the repo to public -- was only meant to be private while I was writing it up! Fixed now. 2.…",{"value":65,"source":51,"evidence":66},"Surfers",[67,68],{"id":54,"by":55,"text":56},{"id":69,"by":70,"text":71},"28901798","lotophage","This is technically very cool, but (as someone who surfs himself)for the purposes of surfing it strikes me as pretty useless. If you spend enough time surfing you learn how to…",{"value":73,"source":51,"evidence":74},"Interest in using sonar to read surf conditions.",[75],{"id":62,"by":11,"text":63},[77],{"value":78,"source":79,"evidence":80},"Raspberry Pi Zero W","maker",[81,84],{"id":82,"by":11,"text":83},"28912356","Oops! I did use a Zero W, and I don't know why I wrote it wrong in the table. Thanks for catching.",{"id":62,"by":11,"text":63},"open_source","launched","solo",{"praise":89,"objections":115,"requests":134,"questions":160,"alternatives":176},[90,110],{"value":91,"source":92,"evidence":93},"Technically impressive and fun project","commenter",[94,98,102,106],{"id":95,"by":96,"text":97},"28901712","mannykannot","This is very impressive. I have no expertise here, but I was wondering if the low confidence in surf is due to bubbles? (I took a quick look at the transducer and software docs,…",{"id":99,"by":100,"text":101},"28901360","BitAstronaut","This is a really cool project! Thanks for sharing.",{"id":103,"by":104,"text":105},"28901412","superamit","I love this so much.",{"id":107,"by":108,"text":109},"28901869","sova","Brilliant work, well done.",{"value":111,"source":92,"evidence":112},"Useful idea for surfers",[113,114],{"id":54,"by":55,"text":56},{"id":58,"by":59,"text":60},[116,124,128],{"value":117,"source":92,"evidence":118},"Bubbles and whitewater make depth readings unreliable",[119,120],{"id":95,"by":96,"text":97},{"id":121,"by":122,"text":123},"28902048","orforforof","I have some expertise here (have used sonar under breaking waves) and I'd say you're spot on. Bubbles act like acoustic black holes, they absorb sound like crazy. Whether you're…",{"value":125,"source":92,"evidence":126},"Less useful than reading the water yourself",[127],{"id":69,"by":70,"text":71},{"value":129,"source":92,"evidence":130},"Transducer mounting through fiberglass may degrade performance",[131],{"id":132,"by":122,"text":133},"28914421","Look up acoustic impedance matching. By analogy, your ultrasound technician needs to smear ky jelly (or similar) on your skin to ensure a good connection between the transducer…",[135,142,149],{"value":136,"source":92,"evidence":137},"Add a GPS and mapping or visualization",[138],{"id":139,"by":140,"text":141},"28901705","qchris","If you're interested, a research group at UC Santa Barbara put together an open source web application [1] prototype specifically for doing visualization and mapping of Ping…",{"value":143,"source":92,"evidence":144},"Make the screen readable from the surfer's position",[145],{"id":146,"by":147,"text":148},"28902359","peterfield","Some UX\u002FUI design comment: The screen is oriented to be read from the side - why not from where the user is?",{"value":150,"source":92,"evidence":151},"Detect sharks or large animals",[152,156],{"id":153,"by":154,"text":155},"28901571","smattiso","Awesome idea man. As an avid water sports guy and an avid shark phobia guy, could you use sonar to detect large moving objects at distance?",{"id":157,"by":158,"text":159},"28906274","latchkey","I'd want one to warn me if there is a shark nearby. =)",[161,169],{"value":162,"source":92,"evidence":163},"Can sonar be used to detect sharks",[164,168],{"id":165,"by":166,"text":167},"28902257","dumdumdumdum","Do sharks (or other sea predators) respond to sonar? Is this more likely to make you prey or would it actually help with annoying them away?",{"id":153,"by":154,"text":155},{"value":170,"source":92,"evidence":171},"Could side-scan sonar be used",[172],{"id":173,"by":174,"text":175},"28902830","geokon","Does this \"Ping Sonar\" thing do side scans? I actually don't really understand the mechanics\u002Fmathematics of sidescanning, but it produces some compelling images. I'm not sure if…",[177,187],{"value":178,"source":92,"evidence":179},"Commercial fish finders",[180,184],{"id":181,"by":182,"text":183},"28901642","Stevvo","You can get little transducers from Garmin\u002FRaymarine that will render a 3D view on your chart-plotter where you can pick out individual fish swimming beneath you in real-time.",{"id":185,"by":11,"text":186},"28912512","Yeah actually I considered just using a commercial \"fish finder\" which is common on boats. Probably could have made that work, but generally their display units aren't waterproof…",{"value":188,"source":92,"evidence":189},"Side-scan sonar systems",[190,194],{"id":191,"by":192,"text":193},"28901759","state_less","There are some sweet side scan sonar systems that send out ~ 200khz chirps to give you a pretty good picture of the sea floor. It might make for a nice map of the bottom, but I…",{"id":195,"by":11,"text":196},"28912408","They do sell a scanning one, but it's $2k instead of $300, and big enough to be a little more annoying to get into the surfboard. It'd be fun to have though!",{"comments":198,"answered":38,"key":199},13,[200,203,206],{"id":201,"text":202},"28912294","Oh cool! Hopefully I'll have time to try this out this weekend.",{"id":204,"text":205},"28912337","Can I ask where? I'm in San Clemente (near Trestles) and I've found one break I love that's consistently uncrowded.",{"id":207,"text":208},"28912565","Yeah I'd love to have an \"incoming set\" warning system... Sub might work, drone might work, boat might work, but I think what you really want is a personal bouy anchored to the…",{"commenters":210,"max_depth":211,"maker_replies":198,"first_comment_mins":32,"lifespan_hours":212},69,7,104,[214,216,220,222,224,227,231,234,236,239,242,246,249,252,255,259,262,264,267,268,271,274,277,280,283,287,290,294,296,299,301,302,306,309,311,314,317,320,323,327,330,334,336,339,342,346,349,352,355,356,360,361,363,365,368,371,373,375,378,380,381,383,386,387,390,393,395,397,399,401,406,409,411,415,418,420,425,426,429,434,436,440,443,447,450,451,455,456,460,465,467],[139,41,41,215,140,41],"commenter\u002Fneutral\u002Fidea",[217,41,41,218,219,41],"28901811","commenter\u002Fneutral\u002Fdocs","mLuby",[201,41,41,221,11,43],"maker\u002Fpositive\u002Fnone",[54,43,18,223,55,41],"project\u002Fpositive\u002Fidea",[225,43,18,223,226,41],"28902170","aresant",[228,43,41,229,230,41],"28903036","commenter\u002Fcritical\u002Fidea","TeMPOraL",[232,43,41,215,233,41],"28902424","throwawaylinux",[235,43,41,215,70,41],"28902484",[237,43,41,215,238,41],"28903421","LurkingPenguin",[240,43,41,215,241,41],"28903465","codingclaws",[243,43,41,244,245,41],"28904929","other\u002Fneutral\u002Fidea","bronson",[247,43,41,244,248,41],"28906380","djrogers",[250,43,41,229,251,41],"28902491","ailun",[253,43,41,229,254,41],"28902493","jasonkester",[256,43,41,257,258,41],"28902899","commenter\u002Fneutral\u002Fnone","abrookewood",[260,43,41,257,261,41],"28903080","m12k",[263,43,41,257,55,41],"28906076",[265,43,41,257,266,41],"28903150","grecy",[204,43,41,257,11,43],[269,43,41,270,266,41],"28912759","other\u002Fneutral\u002Fnone",[272,43,41,270,273,41],"28934583","lnwlebjel",[275,43,18,223,276,41],"28903483","9dev",[278,43,41,215,279,41],"28904050","omneity",[281,43,41,270,282,41],"28906861","focusgroup0",[284,43,39,285,286,41],"28904356","project\u002Fneutral\u002Fidea","imglorp",[288,43,41,229,289,41],"28905831","aqme28",[291,43,43,292,293,41],"28907403","project\u002Fcritical\u002Fdesign","nradov",[207,43,41,295,11,43],"maker\u002Fneutral\u002Fidea",[297,43,18,223,298,41],"28954906","Nicholas_C",[95,33,39,300,96,41],"project\u002Fneutral\u002Fperformance",[121,33,39,300,122,41],[303,33,39,304,305,41],"28903542","project\u002Fneutral\u002Fdesign","DoingIsLearning",[307,33,41,257,308,41],"28904916","0xfaded",[310,33,41,257,293,41],"28907438",[312,33,39,304,313,41],"28905102","hydhyd",[315,33,39,300,316,41],"28905588","dylan604",[318,33,41,319,11,43],"28912620","maker\u002Fneutral\u002Fperformance",[321,33,18,322,122,41],"28914322","maker\u002Fpositive\u002Fperformance",[324,39,39,325,326,41],"28901559","maker\u002Fneutral\u002Fdocs","blamazon",[328,39,41,218,329,41],"28901671","dragonwriter",[331,39,41,332,333,41],"28902084","commenter\u002Fpositive\u002Fdocs","MrLeap",[165,335,39,285,166,41],4,[337,335,39,285,338,41],"28903588","hutzlibu",[340,335,39,285,341,41],"28904422","tk75x",[343,335,43,344,345,41],"28906667","project\u002Fcritical\u002Fidea","LeifCarrotson",[347,18,39,304,348,41],"28901422","serf",[350,18,39,304,351,41],"28903485","dmurray",[353,18,41,354,11,43],"28912369","maker\u002Fneutral\u002Fdesign",[132,18,39,354,122,41],[357,38,43,358,359,41],"28902976","project\u002Fcritical\u002Fperformance","bullen",[82,38,41,319,11,43],[362,38,41,257,359,41],"28915222",[62,211,41,364,11,43],"maker\u002Fneutral\u002Fnone",[366,34,39,285,367,41],"28901428","issa",[369,34,41,244,370,41],"28901676","westurner",[372,34,41,215,11,43],"28912383",[153,374,39,285,154,41],9,[376,374,41,270,377,41],"28901717","blktiger",[191,379,39,285,192,41],10,[58,31,18,223,59,41],[382,31,41,364,11,43],"28912803",[99,384,18,385,100,41],12,"project\u002Fpositive\u002Fnone",[69,198,43,344,70,41],[388,198,41,215,389,41],"28904069","berkes",[173,391,39,392,174,41],14,"project\u002Fneutral\u002Fnone",[195,391,41,394,11,43],"project\u002Fneutral\u002Fpricing",[396,391,41,257,174,41],"28915537",[398,391,41,257,11,43],"28921180",[400,391,41,257,174,41],"28926511",[402,403,43,404,405,41],"28902007",15,"project\u002Fcritical\u002Fpricing","Ecco",[407,403,43,404,408,41],"28904025","stephen_g",[103,410,18,385,104,41],16,[412,413,39,285,414,41],"28901666",17,"jcun4128",[416,413,41,270,417,41],"28902212","coupdejarnac",[419,413,41,270,414,41],"28902425",[421,422,39,423,424,41],"28901418",18,"project\u002Fmixed\u002Fidea","comrh",[181,422,39,392,182,41],[427,422,41,270,428,41],"28902551","hellbannedguy",[430,431,18,432,433,41],"28906536",19,"project\u002Fpositive\u002Fperformance","dncornholio",[146,435,43,292,147,41],20,[437,435,39,438,439,41],"28902637","project\u002Fmixed\u002Fdesign","arendtio",[441,435,39,304,442,41],"28902644","keyle",[444,445,39,285,446,41],"28902726",21,"lokimedes",[448,445,43,344,449,41],"28902913","rcpt",[185,445,41,304,11,43],[452,453,41,270,454,41],"28903081",22,"philip142au",[157,32,18,223,158,41],[457,458,39,392,459,41],"28903422",24,"megablast",[461,462,39,463,464,41],"28902275",25,"project\u002Fneutral\u002Fdocs","maddyboo",[466,462,41,325,11,43],"28912436",[107,468,18,221,108,41],26,[],[471,476,481,486,490,495],{"id":472,"name":473,"po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(YC W20)",144,"dev_tools",{"id":487,"name":488,"points":489,"category":480},"28900125","Qvm-Create-Windows-Qube",120,{"id":491,"name":492,"points":493,"category":494},"28886328","command-interface",119,"languages",{"id":496,"name":497,"points":498,"category":499},"28895897","Vizzu",115,"data",false,"v2",{"id":503,"name":5,"line":6,"ai":500,"cat":20,"year":13,"points":14,"comments":15,"rec":28,"s":504,"top":18,"kw":505,"maker":11,"domain":10,"tier":19,"attempts":41,"strip":506,"url":9,"mix":507,"praise":91,"objection":117,"sub":21},28901214,0.08,[23,24,25,26,27],"0550000005315333533131030353301333512055",[31,32,33,34],1794036612274]