WEBVTT 00:00:01.000 --> 00:00:09.800 so for those of you who follow the lus tech tips Twitter and Instagram 00:00:06.640 --> 00:00:13.440 um you'll already be aware that there 00:00:09.800 --> 00:00:16.680 was recently a crisis at our 00:00:13.440 --> 00:00:18.240 headquarters um sorry sorry still a 00:00:16.680 --> 00:00:25.240 little difficult for me to talk about this but I became aware after returning 00:00:22.560 --> 00:00:31.760 from a brief absence that someone had been at my desk touching my things 00:00:31.920 --> 00:00:36.960 sorry excuse me 00:00:35.399 --> 00:00:43.879 so naturally at that point there were two 00:00:40.000 --> 00:00:48.039 Avenues available to me the first would 00:00:43.879 --> 00:00:50.680 be calm measured discourse with my 00:00:48.039 --> 00:00:57.960 trusted employees about the importance of respecting one's personal space and 00:00:54.719 --> 00:01:00.960 possessions while the second would be to 00:00:57.960 --> 00:01:02.840 over engineer some manner of mechanical 00:01:00.960 --> 00:01:10.159 deterrent that would give any Interlopers a much needed Taste of 00:01:06.960 --> 00:01:13.320 justice so in the end I 00:01:10.159 --> 00:01:15.280 decided well let's just say this isn't a 00:01:13.320 --> 00:01:17.960 video detailing how to host a discussion about office 00:01:26.200 --> 00:01:34.040 protocol Mast drop is currently featuring their exclusive case 7xx red 00:01:31.119 --> 00:01:38.600 headphones built by AKG learn more and buy one today at the link in the video 00:01:35.960 --> 00:01:45.119 description meet the enforcer out of the box the elite strike 00:01:42.000 --> 00:01:48.320 Rhino fire is a fully automatic fixed 00:01:45.119 --> 00:01:50.640 Point anti-personnel Nerf gun with a 2.8 00:01:48.320 --> 00:01:57.520 Dart per second rate of fire an arc range of up to 81 ft and a 50 Dart 00:01:54.159 --> 00:02:01.280 ammunition drum capacity it's a beast in 00:01:57.520 --> 00:02:03.600 its own right but it only works when I'm 00:02:01.280 --> 00:02:10.440 around to operate it which means I needed to turn this Hefty foam Blaster 00:02:06.759 --> 00:02:13.200 into a fully automated motion detecting 00:02:10.440 --> 00:02:19.360 stationary Sentry turret so to accomplish this we'll need the following 00:02:15.440 --> 00:02:21.640 three servos an Arduino a webcam and a 00:02:19.360 --> 00:02:26.599 laptop to coordinate it all not to mention some quick rewiring and just a 00:02:24.200 --> 00:02:30.720 touch of fine woodworking now in much the same way 00:02:29.080 --> 00:02:35.160 that you can't make an omelet without breaking a couple of eggs you can't 00:02:32.840 --> 00:02:40.200 modify a Nerf gun without first voiding the crap out of the warranty so step one 00:02:37.680 --> 00:02:44.840 then is to carefully mind you these things are over a hundred bucks 00:02:42.200 --> 00:02:50.720 disassemble the Rhino fire our main objective here is to access the internal 00:02:47.239 --> 00:02:53.159 wiring but the lighter our gun is the 00:02:50.720 --> 00:02:58.239 easier it will be for our servos to turn it and the aptly named Rhino has a 00:02:56.480 --> 00:03:02.319 little more junk in the trunk than we'd like out of the box which which means 00:03:00.120 --> 00:03:09.799 we'll want to remove our bulky trigger assembly not to mention the six D Cel 00:03:05.680 --> 00:03:12.040 batteries that also have got to go once 00:03:09.799 --> 00:03:17.239 the gun is in pieces this is also a great time to give it a quick makeover 00:03:14.599 --> 00:03:22.440 doing it up right involves laboriously sanding off all the logos then taping 00:03:19.799 --> 00:03:26.120 and painting in layers etc etc etc but that's literally as interesting as 00:03:24.720 --> 00:03:33.560 watching paint dry so we're going to skip over that with some video Magic 00:03:30.239 --> 00:03:35.720 ah much better so as you can see we've 00:03:33.560 --> 00:03:39.840 removed some excess weight at the back pulled out the battery pack and isolated 00:03:38.159 --> 00:03:46.239 the internal switch that turns on the motor next we need to assemble the body 00:03:42.760 --> 00:03:48.360 of the turret that this will sit on this 00:03:46.239 --> 00:03:54.799 bottom box is where we install the webcam and laptop so it needs to be nice 00:03:51.360 --> 00:03:57.040 and roomy our first Servo goes inside 00:03:54.799 --> 00:04:02.519 the top of the box and the gun bracket is mounted on top which allows rotation 00:03:59.959 --> 00:04:07.840 along the x-axis we want to keep the load on the servos as light as possible 00:04:05.959 --> 00:04:13.000 especially when at rest which means keeping the weight off of the moving 00:04:09.680 --> 00:04:15.439 components themselves now our first plan 00:04:13.000 --> 00:04:20.720 was to Simply place this ring of ball bearings between the box and the gun 00:04:17.600 --> 00:04:23.160 bracket but during the prototyping stage 00:04:20.720 --> 00:04:27.400 we found that to be insufficient the wood was just too rough and the bearings 00:04:25.479 --> 00:04:33.039 were too small for this to be an effective solution so the way we Sol 00:04:30.000 --> 00:04:35.840 that then was to layer the Ring of ball 00:04:33.039 --> 00:04:41.840 bearings between some discarded CDs thanks AOL that we attached to the wood 00:04:39.160 --> 00:04:46.520 the CDs are the perfect size though some minor modification was necessary to make 00:04:44.199 --> 00:04:50.400 room for the servo and they're smooth enough that the bearings were able to 00:04:48.000 --> 00:04:57.280 roll properly greatly reducing the strain on our servos now that we had 00:04:53.240 --> 00:04:59.759 turn we needed tilt good news though the 00:04:57.280 --> 00:05:05.479 Rhino comes with a tripod mount already ready that is located close to Center 00:05:01.919 --> 00:05:08.120 Mass so we gently modified this to allow 00:05:05.479 --> 00:05:12.639 a dowel to be inserted the dowel fits into two ball bearings that are housed 00:05:10.199 --> 00:05:17.479 in wood panels on either side allowing for ease of movement since the gun isn't 00:05:15.320 --> 00:05:23.000 perfectly balanced we added some small weights until it required very little 00:05:19.840 --> 00:05:25.360 effort to tilt it up and down now our 00:05:23.000 --> 00:05:29.400 Servo installed at the end of the dowel can tilt the gun more quickly 00:05:27.680 --> 00:05:34.280 drastically improving the ability of our s entry to track its Target so with the 00:05:31.919 --> 00:05:40.520 wood frame built we next mounted the remaining servos the Arduino and our 00:05:37.199 --> 00:05:42.360 battery packs now while our initial plan 00:05:40.520 --> 00:05:48.280 was to wire the internal motor of the Rhino directly to the Arduino in the end 00:05:45.759 --> 00:05:53.160 we decided to go with a third Servo and a 3D printed prong controlling a 00:05:50.280 --> 00:05:57.639 mechanical switch then with all of that in place we just needed to neatly wire 00:05:55.600 --> 00:06:01.919 it all together then hook it up to the laptop and webcam in the base and and 00:05:59.720 --> 00:06:07.520 run the software that we downloaded from Project Sentry gun. Rudolf Labs.com a 00:06:05.080 --> 00:06:11.120 super awesome open-source Sentry project that you should totally check out by the 00:06:09.360 --> 00:06:15.840 way now I'll take a moment to give you guys a quick Pro tip when you set out to 00:06:13.319 --> 00:06:20.520 do a wiring job like this no matter how small the project is or how simple you 00:06:18.160 --> 00:06:24.919 initially assume it will be pick up at least two different colors of wire red 00:06:22.880 --> 00:06:29.400 and black for positive and negative are pretty standard don't just get one color 00:06:28.080 --> 00:06:33.400 because you're confident that you can keep keep everything straight and you 00:06:31.319 --> 00:06:36.599 think green is pretty you will end up 4 hours deep into the project surrounded 00:06:35.080 --> 00:06:43.160 by hastily marked wires from five different Motors and two different batteries in a hopeless tangle deeply 00:06:39.599 --> 00:06:45.400 confused and full of regret so so much 00:06:43.160 --> 00:06:50.080 regret all right let's get back on topic before our final test we've got one more 00:06:47.319 --> 00:06:55.120 housekeeping item our final job looks a little messy so uh hey can we get some 00:06:52.560 --> 00:07:00.400 of that video magic going on here I guess we're just going to have to 00:06:57.319 --> 00:07:04.300 embrace the whole junkyard Chic 00:07:00.400 --> 00:07:07.470 aesthetic thing testing 00:07:08.639 --> 00:07:12.319 time oh my 00:07:13.840 --> 00:07:22.960 God oh my God success I can now feel comfortable 00:07:20.280 --> 00:07:28.800 leaving the office knowing that my tools pens and prawns will rest 00:07:26.280 --> 00:07:33.879 unmolested of course for the majority of the time when I'm here I don't actually 00:07:31.280 --> 00:07:38.520 want this thing hovering behind me so I needed to find a way for it to pull 00:07:35.840 --> 00:07:43.360 double duty fortunately with the help of a little open- Source facial recognition 00:07:40.680 --> 00:07:47.599 software it can be easily repurposed as an employee morale 00:07:45.280 --> 00:07:50.280 booster now that's what I call a motivational 00:07:53.240 --> 00:07:59.879 tool satisfaction 100% 00:07:56.720 --> 00:08:01.599 guaranteed nuts nuts we 100% % sure 00:07:59.879 --> 00:08:03.919 you'll love it it's well packaged I'll give it 00:08:04.680 --> 00:08:09.639 that so nuts.com is a familyowned and 00:08:08.199 --> 00:08:14.159 operated company that has been restocking healthy pantries for what was 00:08:12.599 --> 00:08:20.599 it since 1929 they have more than 3,000 products 00:08:17.759 --> 00:08:24.800 not all of which are nuts so we got some cashews chocolate covered 00:08:22.960 --> 00:08:29.560 pretzels can you believe the brand expected me to make it all the way 00:08:26.039 --> 00:08:31.800 through this without making any jokes 00:08:29.560 --> 00:08:36.800 about eating nuts so in a nutshell nuts.com has lots of hard-to find items 00:08:34.120 --> 00:08:40.560 including gluten-free and organic ones they have 100% satisfaction guarantee 00:08:39.279 --> 00:08:45.640 and if you check out the link in the description you can get four free gifts 00:08:42.959 --> 00:08:52.279 in a curated mini shop with your first purchase of $25 or more so go check them 00:08:48.720 --> 00:08:53.720 out over at nuts.com thanks for watching 00:08:52.279 --> 00:08:58.279 guys if this video sucked you know what to do but if it was awesome get subscribed hit that like button or check 00:08:56.959 --> 00:09:01.760 out the link to where to buy the stuff we featured at Amazon in the video 00:09:00.120 --> 00:09:04.480 description also linked in the description is our merch store which has 00:09:03.160 --> 00:09:09.079 cool shirts like this one and our community Forum which you should totally join now that you're done doing all that 00:09:07.680 --> 00:09:12.279 stuff you're probably wondering what to watch next so click that little button 00:09:10.760 --> 00:09:19.299 in the top right corner to check out the latest video over on Channel Super Fun