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Clarkson University, Potsdam ​what the heck is up guys it's jacob here and today we're going to be taking a close look at the raspberry pi so what the heck is the raspberry pi um well for those of you guys who are familiar with these guys these arduino boards you may have heard of a raspberry pi r you may know a little bit about it what is the difference between an arduino and a raspberry pi well if you don't know what an Arduino is then you're really screwed you don't know any of this but we can help you so it an Arduino is basically a microcontroller and it basically runs a program a C++ program and it loops through it and it runs through code and it fully supports itself it can run independently is pretty much just a big huge microcontroller and I see that processes everything it's basically a programmable i see well and the our Raspberry Pi here is a little bit different it's quite a bit different than actually a little bit more complex um so let's go ahead and discuss the kind of the differences between the two and a little get a little bit into the Raspberry Pi so the Raspberry Pi has um it runs all on five volts so it runs well not everything runs on five volts but it only has five volt input so we take a close look we have a USB micro here and it's got a little USB micro slot so you plug that bad boy in it'll run on a computer USB or even a little five volt on USB brick that you might have for your iPhone or whatever it'll run perfectly I know so it doesn't pull much current I don't know how much it pulls off the top of my head but um it's got other regulators on here like a 3.3 volt and its got like a 1.8 volt some weird voltages on here but anyways on this is pretty much an entire credit credit card sized computer it actually run an operating system so whereas a nard we know doesn't really run an operating system it's just a microcontroller this is a microprocessor in fact this is a microprocessor right here this is the ARM processor it's running at 700 megahertz clock speed it's not that fast but it's very fast for a little small development more like this just running a little program for a project that's actually a really good clock speed a lot of like netbooks and stuff may run at you know point 8 your hurts or somewhere around there even a lower end netbook might run or tablet around 1 gigahertz so it just kind of gives you an idea of the power that on this little board has it has 512 megabytes of RAM about half a gig um not about that is a half a gig um it's got an Ethernet 10100 port two USB ports it's got a 3.5 millimeter headphone jack and it has um what did he call it on AV out it's not really a V coz it's not audio and video but it's the you know the yellow analog video jack um no one uses that anymore I really don't know why they put it on this board this is the red v board by the way guys never mentioned that this is the revi board others there's some slight differences between the reveille and the rebbe be with like performance wise with a ram and also i think was some of the actual hardware the interface is on it but anyways so it has an analog video a like said no one will uses that anymore i don't know why they have that it has an hdmi right here this which will probably realistically be using these days um but for those you guys who want to hook it up to your old CRT monitor there you go um anyways what makes us more different from say a normal laptop or computer is these GPI open so we have 23 pins over here i think is 23 don't curr don't hold me on that names 26 or something that actually 26 13 and 13 and they're not all gpio but a majority of them are gpio general-purpose input/output so you know on the Arduino you have your your analog inputs and you also have on your digital outputs and stuff like that well that's pretty much what this is this is an analog this is all digital um and it runs at 3.3 volts not 5 volts like and like an Arduino we're talking 3.3 volts here it's all for a microprocessor not a microcontroller so everything is ranked 3.3 volts here um and you can use these to control or take in environmental you know like a from a sensors or stuff like that and control things outside of this you know you can use this to control them motor you can use it to control a solenoid anything you want you can use the control relay turn on a light with a you know light sensor or whatever you can use it to million things it's the possibilities are honestly endless um you could use one of these pins to drive a whole another circuit and drive anything you really wanted to so um they put out digital signals like I said it's all digital so it can be either on or off or you can have like pwm and stuff like that you can do lots of stuff but there's no analogue sine waves or anything like that going on here alright so I thought I'd just show you guys the board real quick up close um just to give you guys a quick close up so here it is um you get your micro USB port right there a little capacitor voltage regulator very sellable transistors and pastors and crap like that we have the hdmi port right there this is the camera on port right here i think it's like i said a CSI port CSI port for your LCD these are GPIO pins over here you also have other things in here like round 5 volt power stuff like that so it's not all gpio on here's a voltage regulator this is another voltage regulator arm there's your video out your audio out two USB ports Ethernet use your of course your processor and your ethernet controller and then on the back here we have there is your SD card slot so it's pretty much it will go ahead and just take a look around I forgot to mention of course


the LEDs so you have your power LED your activity LED that shows your hard drive activity between it can in communicating with your SD card those are always very handy you may think what would I use that for but if you know anything about computers and if you ever deal with computers you know that's incredibly handy to know how busy the hard drive is and to also know if this thing is dead or not because usually if your operating system freezes up or if your device crashes it's not communicating with the hard drive anymore and when the page is just sitting there still you know it's not trying to load it when the activity lights not blinking you know it's just frozen that means just give up if the lights not blinking but if it is blinking you know it's trying to work to fix your page and to load it and that means just sit there and wait and it will eventually bring your paycheck we have the full duplex light to show if your Ethernet link is full duplex oh we have the link light of course to show that your link is connected and then we have 100 megabit per second link so if you have um these lights we'll all three be blinking or they'll all three be on when you plug in your your Ethernet link to show that you're connected if you're connected 10 megabits per second you're going to just going to have the that you're not 100 light will not be on if you are full duplex the volu blocks light will be on if your hundred made megabits per second which chances are you are on then 100 megabit per second leg will link will light up and also the link light of course blinks with the link activity when you are transmitting or receiving packets through the ethernet port so um another thing this over here these this royal pins on this side is the ethernet controller jtag and on this side this is your GPU jtag on these little row of pins right over here so that's the day tag for those two chips right there so that's just a close up look of the Raspberry Pi itself it runs a lot of operating systems you know its many made for linux so it'll run like linux ubuntu i'll run linux our a raspberry version of linux um Arch Linux any kind of legs you want really not really a GPU intensive it's not going to run your programs but it will run desktop environments it's mainly made for like shell ssh you could probably run up on to server on here without any issues you can ssh into this to connect to it you can also hook up a keyboard mouse and a monitor and use it as a computer if you want it's not going to be very powerful but it will run um so what makes this board so special like i said from a normal computer is the GPIO pins and it kind of replaces like it's sort of like what the Arduino is doing but it's a much more powerful board now like I said it's only 3.3 volts and it can only drive about four mil amps of current / pin so it's not very powerful but what it does is it's a very very powerful processor so you can take outside information from sensors and do some very very intense processing with it and do a lot of stuff with it you could have a have a group of sensors coming in on these gpios and you could also go to like say some motor controllers and control motors with it but at the same time you could have an ethernet jack going into hooked up to the internet and you can display the sensors in real time and on a web page so you could display the sensors on a web page and also control things now a lot of that you can do with an Arduino but that's really maxing out the power of the Arduino and it gets a little sketchy it's not um you know incredibly reliable there's a lot of issues with it you know the Arduino is are somewhat limited to when you start getting into ethernet and stuff like that and how you can interface these with the web they can be easily interface with the web and they can you can easily control things with web but they're not it comes to a point where um it's a little bit too much for an Arduino to manage it's so much easier to work on this and just install a web server itself on this and update information from your sensors on the GPIO pins in real time so that's just one simple example of what this board can do and that's why this very powerful processor comes in handy this is much more powerful than compared to the microcontroller in an Arduino and you don't have to wait for programs to upload you can just make executable files on here and run them right on the chip you can program on the chip you can open up the operating system in program with inside the operating system and then run those programs while the operating system is running without having to reload the chip and waiting for everything to run so it's a much more better environment than an Arduino not much more better that doesn't make any sense doesn't sound right but anyways you get what I'm saying but it's also a lot different environment you're running um a linux operating system so if you're not really familiar with operating systems and definitely if you're not from familiar with linux this isn't going to do you i will unless you start learning that kind of stuff it's much different than the Arduino environment so um I do hope to do a few projects with this um I hope to do quite a few projects with this but is going to take a lot of time for me to get later with it I am very familiar with linux and I'm familiar with Arduino 'he's not really familiar with like um shell scripting or anything like that or what do you call them the files that we can run in Linux to actually run a program not familiar like Python programming or anything like that so I'm going to have to learn myself on this I got it just as a learning experience but so far it looks really cool i did install a linux operating system on here and raining off the SD card on it's very very easy to do you just install it just like you would on any other hard drive and you installed on the SD card pop it in here and it will boot straight off the SD card you can't unfortunately as far as i know but-- off the USBs which isn't it was kind of a bummer but doesn't really matter too much for me anyways um but yeah it looks like it'll bring a lot of projects hopefully I'll come up with some videos and projects with this later but it can take me a ton of time to dig into this and


to learn enough about it to create some cool projects um I am going to be creating a couple Arduino projects coming up here soon but I really want to make some cool stuff with this because this has a ton of potential so um oh another thing I forgot to mention is um the clock on this so you notice there's no real time clock on here there's no clock there's no oscillators there's no nothing like that so there's nothing to keep track of time so the only way this can keep track of time like you know how in your computer you have the little battery a tiny little coin cell in there the little button sell it um retains your information your CMOS information and your time um that way when you unplug the power from your computer it still knows the time it still keeps all your bios settings on with this when you unplug the power it loses those losses the time so the only way this can know what time it is and why does it need to know the time will let's say make a file and you create a file and you want to know the date that you made that file on it would have to use the time for that the only way this can know what time it is is it contacts time server a linux time server over the internet using your ethernet if you're connected to the internet or you can tell time is when you boot it up besides that you start making files and stuff in here they're all going to be labeled with the wrong time so um it doesn't actually keep track of the time there's no battery on here there's no external power supply or anything not external but there's no power supply on board to keep a clock running to actually know what time is so forgot to mention that but not that big of a deal but it is something to keep in mind if you ever run into that issue if that creates an issue for you a lot of people don't know that but anyways that's it for the raspberry pi on this one guys I hope you guys enjoyed this quick little rundown of it and we'll definitely be making some videos on this in the future I probably want to be doing too many tutorials more of a rundown on my projects because I honestly myself don't know a ton about this board I'm running but um that's it for this one guys I hope you guys enjoyed it and like always have a good one Adelphi University.

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