[{"data":1,"prerenderedAt":271},["ShallowReactive",2],{"Categories":3,"NavIndexCategoriesCountFooter":203,"content-\u002F2014\u002F10\u002F15\u002Frabbit-circuit-soldered-up\u002F":204},[4,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,68,70,71,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202],{"category":5},"System Administration",{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":27},"Software Development",{"category":5},{"category":5},{"category":5},{"category":5},{"category":27},{"category":27},{"category":5},{"category":5},{"category":5},{"category":27},{"category":5},{"category":5},{"category":5},{"category":27},{"category":27},{"category":27},{"category":27},{"category":5},{"category":5},{"category":5},{"category":27},{"category":27},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":5},{"category":27},{"category":5},{"category":5},{"category":27},{"category":27},{"category":27},{"category":27},{"category":5},{"category":27},{"category":27},{"category":67},"Drones & RC",{"category":69},"DIY Projects",{"category":67},{"category":72},"Photography",{"category":69},{"category":69},{"category":69},{"category":67},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":69},{"category":67},{"category":69},{"category":69},{"category":67},{"category":67},{"category":72},{"category":72},{"category":72},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":5},{"category":5},{"category":72},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":5},{"category":67},{"category":67},{"category":72},{"category":72},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":67},{"category":72},{"category":67},{"category":138},"3D Printing - Laser Cutting - CNC",{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":138},{"category":5},{"category":138},{"category":27},{"category":27},{"category":138},{"category":138},{"category":72},{"category":158},"Photography,3D Printing - Laser Cutting - CNC",{"category":27},{"category":27},{"category":69},{"category":27},{"category":27},{"category":27},{"category":27},{"category":5},{"category":67},{"category":5},{"category":5},{"category":27},{"category":27},{"category":27},{"category":27},{"category":27},{"category":69},{"category":27},{"category":27},{"category":27},{"category":27},{"category":181},"Home Assistant",{"category":181},{"category":72},{"category":27},{"category":27},{"category":72},{"category":138},{"category":5},{"category":72},{"category":72},{"category":138},{"category":27},{"category":181},{"category":181},{"category":72},{"category":72},{"category":72},{"category":72},{"category":72},{"category":72},{"category":72},{"category":72},191,{"id":205,"title":206,"body":207,"category":255,"date":256,"description":213,"embedImage":255,"extension":257,"image":232,"intro":258,"meta":259,"navigation":260,"path":261,"seo":262,"series":263,"sitemap":264,"stem":265,"tags":266,"__hash__":270},"content\u002F2014\u002F10\u002F15\u002Frabbit-circuit-soldered-up.md","Rabbit circuit soldered up",{"type":208,"value":209,"toc":251},"minimark",[210,214,221,224,227,233,236,239,245,248],[211,212,213],"p",{},"So - the solder breadboards arrived today so I soldered up the circuitry. I've switched to using parasitic power mode for\nthe 1-wire temperature sensors (DS18B20's). To do this you tie both power and ground pins to ground, and add a 4k7 ohm resistor\nas a pull-up resistor between the data pin and 5v.",[211,215,216],{},[217,218],"img",{"alt":219,"src":220},"Circuit wired up in parasitic power mode","\u002Fimages\u002Fposts\u002F2014\u002F10\u002Fcircuit-parasitic.png",[211,222,223],{},"You can also run the devices in non-parasitic mode (they can return results faster in non-parasitic mode) but this requires three\nwires instead of two. You still need the pull-up 4k7 resistor too (this took me a while to figure out when I was testing).",[211,225,226],{},"To change this circuit to non-parasitic requires moving two wires. See the arrows in the next graphic.",[211,228,229],{},[217,230],{"alt":231,"src":232},"Change required to switch to non-parasitic power mode","\u002Fimages\u002Fposts\u002F2014\u002F10\u002Fcircuit-non-parasitic.png",[211,234,235],{},"I do have one issue I can't solve right now.",[211,237,238],{},"If I connect this to a PoE switch then it takes power via the ethernet cable and it gives results - but the actual Arduino\nUno card gets extremely hot - this chip next to the power input connector:",[211,240,241],{},[217,242],{"alt":243,"src":244},"Chip that gets hot","\u002Fimages\u002Fposts\u002F2014\u002F10\u002Fchip.jpg",[211,246,247],{},"If I connect the ethernet cable to a non PoE port and give the arduino power via USB then it does not get hot.",[211,249,250],{},"This annoys me somewhat - I chose the PoE ethernet shield so that I could still get temperature readings even if the\npower to the heaters failed - but I guess I can live with it while I try to find out what's going wrong - I can always\ntrigger an alert based on \"no data available\" instead of a too low temperature.",{"title":252,"searchDepth":253,"depth":253,"links":254},"",2,[],null,"2014-10-15 23:04 +0200","md","Soldering up the rabbit temperature monitor",{},true,"\u002F2014\u002F10\u002F15\u002Frabbit-circuit-soldered-up",{"title":206,"description":213},"Rabbit Hutch-Run",{"loc":261},"2014\u002F10\u002F15\u002Frabbit-circuit-soldered-up",[267,268,269],"rabbits","arduino","DS18B20","dPeprylQ7O6OPzsWJ3WPkhwKwqAb-AUka30PVANETLk",1775293010106]