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Where to find biconcave lens?

I want to make the google cardboard VR, but I cannot find biconcave lens. Is there any household thing that contains biconcave lenses with about 45 mm focal lengh and can the spectacle lenses be used for this project? Also buying online is not an option for me.

Question by Ahtasham Ahmad Mohtashim    |  last reply


VR gaming parties anyone?

Last week I was "volunteered" by friend to help setting up a rented and empty factory building for what he called a VR gaming party.My job was down to somehow get enough cables and power outlets from that rented industrial power box inside the building.And well, organising about 800m of network cables with routers, switches and whatnots :(After a hard days work and testing all we went for a well deserved beer.Next day I pooped in to see how the computers are going and where things like tables, catering stations, portable toilets and so would go.Well, the later ended outside for various reasons...To my surprise all hardware was basically boxed in and then padded all around.And although not even running at full capacity the computers already created a lot of heating the building.(Mind you we getting into the summer here)The most confusing thing was seeing several elevated work platforms with people creating a maze of wires about 2.5m above floor level.Now it dawned on me that this "party" might slightly more than what I was used to in my gaming years.Was curious enough to ask if I could jump in again when the actual thing starts and was invited for a quick test later that night.Walking around in an empty building while thinking you are inside some racing game was a strange thing to say the least.I learned why there where two people around me and my brain not always makes the right decisions without the sensory information provided by my ears matching what my eyes see.A bit later when most players where set up and active I realised that this type of VR is not for me.Ever seen those movies where someone has really bad halucinations and tries to fight against something that is not really there?Yes, that is exactly how it looked like LOLSometimes all is in slow motion then suddenly they jump shoot their virtual guns and go for cover...I guess if you are not in it then you just won't understand.Watching the screens for a while I could at least find some relation to the action but it was like another world if you know what I mean ;)What do you think will the near a slightly further future bring us in terms of virtual reality?Will it affect us as badly as social media and mobile phones already do or will it bring some real benefits for everyone?By the way: Virtual Reality Cars are already in the design visions!Self driving cars that put you into another world while driving - why think you sit in the car if you can put the seat back and immerse yourself into a virtual beach?

Topic by Downunder35m    |  last reply


October 2014 Build Night with DODOcase

50 SPACES AVAILABLE Deadline to sign up: Tuesday, September 9. Accepted spaces will be notified by Wednesday, September 10. OCTOBER BUILD NIGHT We are partnering with DODOcase, maker of award winning, handmade cases and sleeves for tablets and phones, for our October 2014 build night. DODOcase recently developed a Smartphone Virtual Reality Viewer inspired by Google’s Cardboard Project (**more info below). Sign up to participate in the build night and we will ship you a package that includes: (10) DODOcase Cardboard VR Toolkits - you must have an iPhone or Android to use the kit. At your build night we would like you to make physical mods to the kits and/or develop new software to support to support the Google Cardboard Project. Some suggestions for the VR Kit Hacks (physical and electronic): Adding a strap Accommodating glasses Trucker Hat attachment Colors/Designs for it Applications using Accelerometers Content/Apps for iPhone and Android Game controllers Any other mods that are “outside the box” **About DODOcase VR DODOcase believes the next million VR experiences will come from mobile devices and has made it possible for the masses to explore VR in a cost effective, attainable way with the DODOcase Smartphone Virtual Reality Viewer. The company's build-your-own kit costs only $25 and will allow anyone the ability to experience VR. Inspired by the Google cardboard kit announced at the I/O conference, DODOcase was quick to act by designing and developing its own version of the viewer and an app (in beta) to go with it. Since June 26th, the company has sold more than 15,000 units to VR enthusiasts and developers around the world.  DODOcase is looking to connect with content and app developers who are pioneering the VR space. Email DODOcaseVR developers@dodocase.com. HOW TO PARTICIPATE: Host a Build Night: pick a night or day in October (any night/day) to host a project build night using the Google Cardboard VR Toolkits. You can host multiple build nights during October to work on your projects. Post 3 Instructables: post 3 Instructables using the Google Cardboard VR Toolkits. Not posting these Instructables will affect your chances to participate in future build nights. Brownie Points (not required): after the build night post a forum topic on Instructables about your event. Include pictures, stories, etc... Here are two examples from past build nights: Noisebridge and Makers Local 256. We may even feature your photos on the homepage. CHALLENGE The space that submits the Instructable with the most unique mod of the DODOcase Google Cardboard VR Toolkit or content/app for iPhone or Android will receive a copy of the Autodesk Product Design Suite Ultimate. Grand Prize (Autodesk Design Suite): Virtual Reality Kinetoscope Parlor by Taipei Hackerspace Honorable Mentions ($25 DODOcase Gift Certificate): Deadmau5 VR DODOcase by Techlab217 How to make DODOCase VR kit V 1.2 from your old V 1.1 by Cairo Hackerspace   SIGN UP - Please only sign up if you are able to complete the requirements listed above. This is a 2-step sign up process. YOU MUST COMPLETE BOTH TO FULLY SIGN UP. Fill out this google form. You will then receive a private message in your Instructables inbox by September 10 asking for your shipping information. You cannot receive the DODOcase Cardboard VR Kits without completing this step. Selection Process: This is NOT first come first serve. We look at past build night participation, past project quality, and project proposals for the current build night. If you haven't participated in a build night OR haven't submitted Instructables for build nights you signed up for we suggest your space create Instructables over the next few months and submit them in future applications. RESOURCES: Kit Instructional Video DODOcase Blog Google Cardboard Project DODOcase App (beta) Instructables App (for documentation during the build night): iOS and Android JOIN US ON SOCIAL Follow us and reach out on social media! Twitter: @DODOsays, @DODOcaseVR, @Instructables, #dodocaseVR JOIN OUR ANNOUNCEMENT LIST If you are interested in being directly notified about future build nights fill out this form. You will receive an e-mail when new events are announced in the forums. Please only sign up if you are not already on the build night mailing list. ABOUT BUILD NIGHTS Instructables is sponsoring monthly build nights at makerspaces and hackerspaces around the world. Each month we partner with a different company to send you materials and/or tools to run a workshop at your space. In return your space posts Instructables from your build night.

Topic by Carleyy    |  last reply


SoHa SMART's October 2014 Build Night with DODOcase

Getting down to business with DoDo Case at our recent board meeting where we were graciously given DoDo Case VR glasses by Instructables. http://www.dodocase.com/products/google-cardboard-vr-goggle-toolkit  for a build night!  It was a fascinating way to experience virtual reality on your smartphone and you know what they say; all work and no play...  We also created an Instructable in which one of our board members Ben Finio addresses the issues we though could be made better with the directions. Thank you Instructables team and DoDo Case VR for the great night and we look forward to many more!

Topic by Bullock STEAM MakerSpace    |  last reply


Arduino bluetooth HC-05 game controller to control Android games

I got a new project to make a pretty unconventional (fitness) game controller using Arduino to control Android games. The ideea is the following: using the Android VR technology (Cardboard or Dive) it was pretty simple to create a basic game (3d world to walk around) using Unity3D and Dive SDK. If you put on the Google Cardboard, the VR experience begins. But still so few devices are on the market, which give you back the control over your smartphone, which now is fixed in front of your eyes. I want to use this and make a fitness app which will be controlled by running on a treadmill (or using a workout bike). Something like the old Nintendo Wii and the running game from Sports. Or a game like Temple Run, in which running the treadmill faster, gets you faster in the game. For this I would like to create a game controller which records the leg movements, direction, body position, etc. which would then influence the actions in the game. A lot of details I still need to work out. So the question is, does anybody know of a guide or tutorial on how to create a game controller like this, using an Arduino a bluetooth module like HC-05. The controller should not be bound to a specific game or 3rd party app, should work like a usual game controller for android (connecting to some bluetooth android game profile?). There are many android game controllers out there which dont need a special android driver/3rd app to control any game. So this has to work somehow. So how can I programm an Arduino to send (once paired) the same events a bluetooth gamecontroller (or bt keyboard or mouse) sends, which doesn't need any 3'rd party Android app to be able to send basic key pressed events to a random game. Best regards, F

Topic by fcfelix    |  last reply


Oculus GO - The little sideloading guide

It seems making an Instructable these days requires lots of pictures, detailed steps and tons of instructions.So before I try to paste my attempt here, I will point something out for the support team:1. There is little point in including pictures of a VR headset or how to plug a USB cable in. Same for images showing a DOS window and the command typed in it - they are the same as in the instructions...2. With little to no option to create an Instructable that requires actual code usage and properly embedded picture, let alone good editing options: How do you suggest one would accomplish this taks?3. With no category to post such Instrucables it is my personal opinion that these catergories need quite some updates! They are still the same as years ago despite life evolving around it...If you just went into the mobile VR world then you might feel a bit restricted compared to what you know from your smartphone.Over the months firmware updates provided us with some much needed things but a bit is still left out. In this Ible I will try to show way to get a bit more out of your GO. Be aware that a lot of it still requires a bit of manual work and a computer.If you are just curious then please read on and you might still find something interesting that you did not know yet.Getting started...One thing we certainly need is a way to access the GO and to install additional apps on it that are not available in the store.For this we need to activate the developer options. Unlike your normal Android device this step works only from the device you paired with your GO. Go into the settings and there look for the developer mode. Once you try to activate it Oculus requires you to sign up for a developer account. All this of course needs to be confirmed through Email activation, you know just to make it complicated and get more info about you ;) From there it is straight forward and like on any Android. Activate USB debugging, pair with your computer by USB cable and on the GO authorise the connection. Please also tick the box to make this permanent as otherwise you will be prompted every time. In case you are not so familiar with this just Google how to use ADB on Android - it is simple. I will add the required files and drivers in a later step dedicated to it.If you need more help getting the right options done or where to find them, please consider the great help for this offered on the Oculus developer sites. It makes sense to spent some time there as you find a lot of good info that might come in handy once you really want to get serious.ADB - A must have...You will find the drivers and all, as said, a bit later. ADB is the Android Debug Bridge. It allows us to get access to the (user)available file systems, do some basic tests and if supported even flash a firmware or make a backup.If you already used ADB for another Android device then you will only need the drivers for the GO. Otherwise you need to set up the enviroment for the Debug Bridge first. In the downloads will be a simple installer for this purpose. It is vital that you authorise your computer on the GO, best to tick the box to make it permanent.If you open a command prompt where you have ADB installed you can do some simple tests. Setting all required paths and system variables in Windows would allow you to access ADB functions from any folder on your computer. The later might be easier if you do not want to copy all related files into your ADB folder. Makes no real difference though and is up to your preferences.The command ADB devices should show you now that your GO is connected by listing it. If nothing shows up then please check the USB debugging option is set in the developer options. A reboot might help too in some cases. With this sorted we are good to go, almost at least...How to install "unknown" apps?As you might have noticed there is no playstore and all available stuff in the official store is VR based.Getting some essential apps on it seems to be impossible.Again the help offered by Oculus in the developer sections is a vital source, so please don't be afraid to read there ;) There are two basic ways of doing things on a device with so many restrictions.1. Just use ADB install packetname Where packetname is the filename for the app in question, for example Netflix.apk. With all apps you need in one place this is quickly done.2. Use a dedicated app installer or manager for the job. I will include one that actually works with the downloads. Same fore more detailed instructions.The thing is though that only apps designed and signed for VR will show up in your normal launcher. All other (supported) Android apps will show up in "unknown sources" in your library. Apps not supported for this purpose won't show anywhere! For them you need a dedicated launcher, which will be placed in the "unknown sources" section ;)Why do I spoon feed you here you might wonder? To be honest: If you already read some terms and basics it will be much easier to remember. Repetition is the key ;) I see little point in providing a simple to follow list of intructions as a week later you would struggle to do it again without the list in front of you.Our first unknown apps!Deciding what you might need in apps is one thing, knowing in what order you can safe hours of your life is another. I simply don't think you want to juggle with ADB whenever you want a new app that is not available in the official store. So for starters we will need something that is able to install apps for us. And since we can't use it without something to find and start it we also need an app starter. Basically like HALauncher for Android TV.The detailed instructions for this can be found with the downloads. First the app starter is installed, it will provide us with a living room like view onto a big screen. On the screen you will find all apps that are otherwise invisible to you. Some might tempt you to try them out - just don't! Unless you really know what you are doing you have a good chance to do something bad. Use the apps you know and the apps you added but none of the tempting system apps you might see.The APK installer will show up there too and is used to make installing apps a bit easier. You can copy them now onto your GO's internal storage and use the app installer to install them - how easy is that? Another option I included is the Aurora store - a fork of the YALP store and able to work without any playstore requirements. Downside is that the VR controllers are not fully supported yet as it is more aimed at TV sets. A BT touchpad works though if the controller or a gamepad fail. I only included Aurora as it could be a nice alternative one day with full VR support. Just search or browse for all the apps available in the playstore and install what you like. Be aware though that not everything will work with the remote. Some games and apps can be operated with a game controller though.It is getting nicer already ;)By now you might have already installed some things as you just could not wait to skip to the downloads.Well, can't really blame you, can I?Anyways, we now have the option to install more apps that we know from our non-VR Android devices. Oculus might make it harder in the future though - or they see it the same way and offer ready to go options one day. Till then it is up to you....Youtube VR might be nice but it is also still quite buggy and lacks some basic features. So getting a modded Youtube app could be a way out if you need comments for example. Kodi is still a must have for many Android users, especially the sport nuts with us. A filemanager is also something most Android users value. I will include some but again it comes down to what YOU prefer here. And with a basic way to install apps now you can also remove them again if you decide they don't work as expected.Get a bit used to the app launcher and how to install apps. Sideloading is fine for those used to it but some might prefer to just copy some apps on the GO and them use the installer with the remote. In the near future we will get support for external sorage, so using a USB stick or SD card in a reader will make the USB cable obsolete for file transfers. Some headsets already support it, so chances are by the time you read this yours will too. Although it still is a good way to keep your GO charged while copying big files ;)Precautions and Words of WisdomIt all sound nice and easy now but there are dangers you need to be aware of! Installing apps or games that are not fully designed for the GO or VR use can mean crashes. A lot will work but that does not mean it will keep doing so. A firmware update could one day end the support for sideloaded apps that are "non-VR". Especially messing with the app launcher can mean sudden disaster. Things you normally can not see are often hidden from you for a good reason. I will take no responsiblity for problems you caused by misusing system apps !Console emulators are a lot of fun and there are ways to even stream them from your PC in reasonable quality on a low end computer. But these and some demanding games also cause a lot of CPU usage. As the system is not optimised for 2D content it can mean that your battery runs out faster. In some cases you might not see the warning to charge, so be aware of time when immersing yourself.Stay away from any app or game that requires playstore components! Play Games for leaderboards might be no issue, especially if you don't need this feature. Online gaming like multiplayer actions will not work if it requires Google services for it! Similar story for hardware you don't have. If it is only designed for touchscreens than it might not work with the remote. And if it does not support gampads either... Apps that only support the wrong display orientation are a no go too.What Non-VR Stuff Actually Works on the GO?A lot and it will be possible to do even more. There are already streaming options for your own videos like Skybox, Moonplayer and they all support DLNA servers too. So watching normal, 3D or VR movies from a media server is no problem at all already. Getting games to work is another story all up. ALVR is a good platform to stream VR games from your PC to the GO. Unlike the Rift you won't even need an overpowered gaming PC for it. Virtual Desktop is a paid app but well worth the money if the support and features keep going as they do right now. With it you can use your computer or laptop from the GO. Watch movies, surf the net, play games. The GO more or less becomes a normal Windows computer only that you have the screen right in front of you.It will certainly be possible to code a simple VR app that works as a shortcut for non-VR apps. Like how right now you get the pic and description for a VR exerience and a button that starts the stream in the player. Downside is the requirement to certify such an "app" to make it visible in the normal launcher.Downloads and Instructions....Finally you get to the point where you can actually download something :)To make it all a bit easier and to ensure I won't miss a vital bit I did a factory reset on my GO to start from scratch :(Things might change in the future, so I will include the instructions as texfiles with the download.If I see a real requirement for screenshots I will include them with corresponding filenames.I think this way it is easier than scrolling through an Instructable as you can just print it all directly.Those without an account (yet) might value this too.Based on the feedback, questions and general comments I will change the contents of the download accordingly.Same for download links to avoid bloating up the download with outdated files.Easier for you (if you read this a few months from now) to download the newest files directly from the source.So don't be too disappointed if the download seems to contain less than what you expected.What seems to be missing will have links in the instructions.No files will come from unverified or unsecure sources!Whatever I include in the downloads directly will be checked for malware of all kinds.The same standards are true for the sources I provide.So no clickbait, ad sponsored re-directors or such crap.Please read the detailed instructions carefully, then read them again while actuall following the steps on your GO or computer.Do not blindly read it and jump onto doing it the first read!For ADB commands just copy and paste them - I might write some batch files though, so check for them in the instructions and make use of them.Things might not work out as planned, so if in doubt double check all the steps taken.What is in the provided instructions is tested on my GO's and works on the firmware version current of this writing.Download the guide and files from FilefactoryIn case the PDF in the download is not detailed enough, just ask in the comments ;)

Topic by Downunder35m    |  last reply


Troubleshooting usb powerbank 3 IR LED setup

I am an amateur with setting up circuits, but I am really interested and understand most electronics, I am just confused with the issue I am having. Background:  I am building a wireless google cardboard so that I can play PC games on my phone through the VR headset rather than crappy app games. Basically a wireless Oculus Rift, however I know it wont be anywhere near as good it's just a fun project. I have Infrared LEDs which I will use with freetrack and my modified webcam without IR filter to do my head tracking. Issue: I am trying to power 3x Infrared LEDs from a usb powerpack. Here is the one I am using http://www.ebay.com.au/itm/221468778309?var=520334132263&ssPageName;=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 The reason for using this as a power source is I can easily attach it to the headstraps on the google cardboard, it is just about the smallest power setup I can think of (better than using 3x AA batteries), it was cheap, and it outputs 5v which is perfect for powering 3x IR LEDs with a forward voltage of 1.6v and 60mA current. When I use this powerbank to power a single LED without a resistor and I look at it through my webcam, even with all the lights off and the webcam 5mm away from the LED you can barely see it light up. I tried the led on another powerbank I have here which is 10,000mAh so it is massive, and it was much brighter on the webcam. I then used my samsung TV remote and pressed a button while aiming at the webcam and it was EXTREMELY bright. Basically I want the LED to be as bright as my remote, or as much as the LED is capable of. Why would the powerbank show the LED so dull? I have confirmed it is outputting 5v, but when I try test the current with a 'usb charger doctor' between the charger and usb cable, or a multimeter between the wire and the LED it shows zero current. I should be able to just connect all LED in series with a small resistor and it should just work at full brightness, but the power bank cannot even power a single LED well enough to see properly on the webcam. It's becoming really frustrating, any idea what's happening? Best solution?

Topic by dom.curulli    |  last reply