{"id":13724,"date":"2019-05-28T09:53:34","date_gmt":"2019-05-27T23:53:34","guid":{"rendered":"http:\/\/legoeng.local\/?p=13724"},"modified":"2019-05-28T12:50:41","modified_gmt":"2019-05-28T02:50:41","slug":"linkage-warm-ups-2-lego-jumpers-and-hoppers","status":"publish","type":"post","link":"http:\/\/legoeng.local\/linkage-warm-ups-2-lego-jumpers-and-hoppers\/","title":{"rendered":"Linkage Warm Ups 2: LEGO Jumpers and Hoppers"},"content":{"rendered":"<p>Here&#8217;s another easy challenge to expose students to linkages. Jumpers use the same 4-bar linkage as\u00a0<a href=\"http:\/\/legoeng.local\/linkage-warm-ups-1\/\">punchers<\/a>, but are angled to push down to drive the mechanism up.<\/p>\n<figure id=\"attachment_13725\" aria-describedby=\"caption-attachment-13725\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/legoeng.local\/wp-content\/uploads\/2019\/05\/Hopping-Robot.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-13725 size-medium\" src=\"http:\/\/legoeng.local\/wp-content\/uploads\/2019\/05\/Hopping-Robot-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"http:\/\/legoeng.local\/wp-content\/uploads\/2019\/05\/Hopping-Robot-300x225.jpg 300w, http:\/\/legoeng.local\/wp-content\/uploads\/2019\/05\/Hopping-Robot-768x576.jpg 768w, http:\/\/legoeng.local\/wp-content\/uploads\/2019\/05\/Hopping-Robot.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-13725\" class=\"wp-caption-text\">A LEGO hopping robot with legs based on a 4-bar linkage<\/figcaption><\/figure>\n<p>They can be easily modified to jump straight up, or to hop in a direction by either changing the angle of the legs, or by orienting both legs forward like in the following video:<\/p>\n<p><iframe loading=\"lazy\" title=\"LEGO Jumpers - 4 Bar Linkage Warm Up\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/e1t1AAWnSdk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>How else can your engineers make them hop forward? What methods result in the farthest hop?<\/p>\n<p>For a more complicated challenge, jumpers can be motorized, which allows students to explore how the timing of the front and back legs affect hopping. Here&#8217;s a video of a couple experiments &#8211; can your engineers figure out why delaying the front leg&#8217;s jump causes the robot to hop forward?<\/p>\n<p><iframe loading=\"lazy\" title=\"LEGO Hopping Robot\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/xCcaO_8iy9w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>This isn&#8217;t a very robust build, more of a quick hack to test the impact of leg timing, so we didn&#8217;t post build instructions. Maybe we will in the future if we put more work into building a robust hopper &#8211; or if your engineers come up with a better design &#8211; but for now you can find detailed pictures of this build\u00a0<a href=\"https:\/\/www.diywalkers.com\/lego-hopping-robot.html\" target=\"_blank\" rel=\"noopener\">here<\/a>.<\/p>\n<p><iframe loading=\"lazy\" title=\"LEGO Jumping Robot - take 2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/ug3UmvnbaRQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<div class=\"also-in-this-series\">\n<h3 class=\"series-title\">Also in <q>DIY Walkers<\/q><\/h3>\n<ol start=\"1\">\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/diy-walkers-explorations-of-the-trotbot-walking-mechanism\/\" title=\"DIY Walkers: The TrotBot walking mechanism\">DIY Walkers: The TrotBot walking mechanism<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/diy-walkers-trotbot-using-ev3\/\" title=\"DIY Walkers: TrotBot using EV3\">DIY Walkers: TrotBot using EV3<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/diy-walkers-strider\/\" title=\"DIY Walkers: Strider\">DIY Walkers: Strider<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/ev3-trotbot-version-2-inspired-by-a-galloping-horse\/\" title=\"EV3 TrotBot Version 2: Inspired by a Galloping Horse\">EV3 TrotBot Version 2: Inspired by a Galloping Horse<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/hexapod-trotbot-a-classroom-friendly-diy-walker\/\" title=\"Hexapod TrotBot: A classroom-friendly DIY walker\">Hexapod TrotBot: A classroom-friendly DIY walker<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/diy-walkers-klanns-mechanical-spider\/\" title=\"DIY Walkers: Klann&#8217;s Mechanical Spider\">DIY Walkers: Klann&#8217;s Mechanical Spider<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/rapidly-prototyping-strider-ver-3-to-be-smoother-stronger-faster\/\" title=\"Rapidly Prototyping Strider &#8211; Smoother, Stronger, Faster\">Rapidly Prototyping Strider &#8211; Smoother, Stronger, Faster<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/linkage-warm-ups-1\/\" title=\"Linkage Warm Ups 1: LEGO Punchers and the 4-Bar Linkage\">Linkage Warm Ups 1: LEGO Punchers and the 4-Bar Linkage<\/a>\n\t\t<\/li>\n<li class=\"series-post\">\n\t\t\t<a href=\"http:\/\/legoeng.local\/linkage-warm-ups-2-lego-jumpers-and-hoppers\/\" title=\"Linkage Warm Ups 2: LEGO Jumpers and Hoppers\">Linkage Warm Ups 2: LEGO Jumpers and Hoppers<\/a>\n\t\t<\/li>\n<\/ol>\n<p><a href=\"http:\/\/legoeng.local\/series\/diy-walkers\/\">View the entire series<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Here&#8217;s another easy challenge to expose students to linkages. Jumpers use the same 4-bar linkage as\u00a0punchers, but are angled to push down to drive the mechanism up. They can be easily modified to jump straight up, or to hop in a direction by either changing the angle of the legs, or by orienting both legs [&hellip;]<\/p>\n","protected":false},"author":469,"featured_media":13725,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[99],"tags":[],"_links":{"self":[{"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/posts\/13724"}],"collection":[{"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/users\/469"}],"replies":[{"embeddable":true,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/comments?post=13724"}],"version-history":[{"count":0,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/posts\/13724\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/media\/13725"}],"wp:attachment":[{"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/media?parent=13724"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/categories?post=13724"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/legoeng.local\/wp-json\/wp\/v2\/tags?post=13724"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}