arduino json

 


 
What is this data format JSON? How does it? What does it look like? What does it mean and if you happen to have data in a JSON format? How could you use that data in a program that you’re writing something? It runs in the web browser and JavaScript using the p5.js library? Okay, so I have some information I talked about in the previous video. If you watch that previous video, by the way, thank you that was kind of you um, so okay, so let’s, say well the scenario that I’m posing here let’s go the interesting little you’re interested in flowers and you you looked all over the Internet. You couldn’t find any information about flowers, but you have this book all about flowers, here’s, something you could actually do novel concept. You could just type the data yourself into a file to use in your program, so let’s first think about how that might work. So, actually, even before I start doing anything over here, let’s do that, just even in our code right. So you know you, you know how to program, or at least I do. I think you do if you were watching the videos – hopefully cuz. I don’t know if I’m doing a good job or not, but you might say to yourself like. Ah, I am going to make this object called flowers and it’s going to have a name I’m, just going to say it’s a flower it’s going to have a name like sunflower and it’s going to have color, which is welcome to color.

And then I realized there’s. A problem – I should just admit that there’s a problem here, so what I started doing by the way was I I want to use the p5.js color function, which is so nice, but I could make a nice yellow color, which yellow is red and green. I think, but that’s not going to work up here. The color function is only available once I’m, actually in setup once the page has loaded so I’m going to make that global, variable and I’m going to make my object here. Sorry so named sunflower color is and let’s not name it color, because that’s a key word, let’s name it co. L is color. How do you make yellow red green? I think that’s right about like so red and a little bit more green and right. So I’ve now whoops and there’s no semicolon there. So I’ve now made data. I’Ve made an object, a JavaScript object, it has data in it. So I could be, you know, add all sorts of other data like what’s, the average height of a sunflower, and what season do sunflowers grow and what’s the latitude longitude in the world where sunflowers appear. I could keep adding all that data as these key value pairs, and I could do something like say like. Oh now, I’m going to draw a you know black background and then I’m going to say, fill by the flowers, color and I’m, going to draw a text on the screen with the flowers name at you know: pixel value 10, comma 50 and I could say a Create canvas 400.

400. So you know, if I were to run this sketch, we can see. Look at that. I’Ve got my text called, yellow sunflower. I have the yellow sunflower text right there on the screen, so this is working with data. This is actually working with data in JavaScript object, notation because that’s, a JavaScript object and the notation is the syntax of JavaScript. So actually, working with JSON data is exactly what you already know how to do if you’ve been programming your JavaScript. So I want to come back over here and then put our brains back in this scenario. So you have your encyclopedia flowers and you’re, starting to put all the data into a data file. So one of the pitfalls of this here is this isn’t. This is this works, but so that’s so great like what, if I had like a thousand different flowers, are huge amounts of data. I wouldn’t want to have all of that. Just in my code. I want that to be somewhere else. You know eventually, I might want that to be served up by this, like web server somewhere that’s an API that just sending everybody in the world data about flowers, because wouldn’t have be nice, but here at this moment I’m, just using it for myself. The thing that I would want to do is put the data in a separate file, so let’s look at how we might do that now, there’s one thing that’s different, which is that and somebody correct me on the internet.

If I run about this, but one thing that you need to do once you move the data to a separate file. First of all, you need to create a file and I’m going to call it like flower dot JSON. So our sketch files have been called sketch, dot, J s because they’re JavaScript files files with JavaScript code in them now I’m making a new file, it’s extension as JSON, because it’s JSON data. But this is a data file, important difference, there’s no code in here it might have this same syntax as this, but there’s nothing to execute there’s no code to run in there it’s just information that can be loaded into an object. The point is, this is no longer going to be written directly here: flowers, somehow gon na equal load, this particular file, so the difference is there’s no variable name in this file. It’S just an object, so the file starts with a curly bracket ends with a curly bracket and then other thing that’s important is, if you notice name, is a string. So the names bout, knits or name is the property of flower and its value is sunflower. A string in quotes, but in the JSON file you’ll want these property names to also be in quotes. So you’ll see that what I want to do is say named sunflower and the other thing that I can’t do right. I did this in my program. Is I executed the color function here, but I could do something different like I could say, it’s red value is 255 it’s.

Green value, you know, is like 200 and it’s blue value. Is Europe so notice? The syntax here it’s an object, and this should be in quotes it’s a bunch of key value, pairs, property name value. So what all the flower has a name. It’S sunflower, a flower has a red value. 255. All of these is a list of these properties. All separated by commas, the last one has no comma after it and then a close curly bracket. Now, as I go through more and more examples, your goal to see that these this file can get enormous ly more complex. It can have arrays built into it. It kind of objects, nested in other objects and I’m, so excited to look at all of those scenarios, but right now, I’m, going to keep it very, very simple, but I’ll reason why I’m mentioning the syntax so specifically, is one comma out of place. One quote out of place your program, won’t work and often you’re not going to get such a great error message. So you know we have to sort of like think about and look at like how you can deal with that. But one way of dealing with it is just be really really careful as you kind of enter your data into a JSON file. So you know I pretend reading my flower encyclopedia. I found all this information I’m going to format the data, so I can use it. So I’ve come back over here.

How am i doing on time? Seven minutes you’re watching a video for seven minutes, it’s, really quite impressive on the internet and I’m going to go over here to this plus and I’m going to hit. That plus, which is going to allow me to add a new file and the new file, is going to be called flower I’m. I was saying flowers because ultimately, I kind of want this file to be a list of different kinds of flowers, but right now, I’m kind of being simple, so I’m, just going to say flower, JSON and I’m going to do exactly what I said: I’m gon na Say: name: son, oops name, sunflower, our is 255 G is 200 and B. Is a B is zero? Now, so you can see here now I have this file called flower. Json and it’s got the data in it. Now I hopefully did that correctly, but let’s say you’re, not sure if you did it correctly well, there happens there’s a lot of these tools online there’s, a lot of tools online that allow you to validate or check the syntax of a JSON file to make sure It’S valid so I’m going to very quickly just copy paste this and go to Chrome I’m, going to open up Chrome and I’m going to go to JSON 4 I’m going to Google JSON format, err and just click. On the first thing that comes up I’m, going to paste the data into this box and I’m going to click a process right here which is going to validate and check my JSON and it says valid and you can even see it’s sort of like syntax, highlighted And did some things with it and we might look at this later some other ways you could do this, but this I’ll try to include a link to this particular tool in the either an annotation or in the comments below so so.

This is something you might want to do and now once we’ve done that the question the question is now here under sketch js. How do you change right? I don’t want to say flower equals this stuff right here in the code I want to say, flower equals the stuff that’s in that file. How do I get the stuff that’s in that file? So the way that you do, that is with a function called load. Json so this process of saying like ah I don’t – want to type the code. I want var flower to equal. This stuff is accomplished with this function, load JSON. So I believe I talked in some video link below or link in an annotation I’d like to do that about load image, there’s also, a function for a load table, there’s load sound if you’re using the p5 sound library. So this is just yet another way of grabbing some sort of external piece of information. It could be a text file, a JSON file, it mp3 file, a movie file, an image file, loading it for use in your sketch. In this case, load JSON takes everything in the JSON file and essentially makes all of that in, as as the data stored in that variable, and then I can access it exactly the same way, I would normally in JavaScript as if I had written all that data Into the variable itself, hard coded in the code hope that makes sense so now, but there’s a couple pitfalls with this.

The question sort of now arrives like: where do you put that load JSON code I’m? It would make sense to put it right here right. Instead of this, if I comment oops I’m going to like put this down here and comment, it out, I would say: low JSON flower JSON, so this would make sense to you you’re just going to say hey instead of setting it equal to this stuff directly. Let me load it from the file and then of course, one thing I would have to change is flower. Our flower G flower be right because I don’t have a color. I have our RGB, so this should work it’s not going to work. I don’t think it’s going to work. Let’S, try it so you can see. I uncaught type. Error cannot property two string of undefined that’s, a very sad error, it’s, a couple things sad about that era. I don’t know what line fifteen thousand eighty five that’s, not! I don’t have fifteen thousand lines of code, so it’s reporting to you something that’s happened deep into the p5.js library and essentially the issue is, I am trying to access properties of a flower object that doesn’t exist, but it should exist. I loaded it right there. This is a time where I’d, like an o, meditate and remember that JavaScript is always asynchronous sort of like I’m trying to I’m trying to introduce singing into the videos. I think that’s, probably a terrible idea, but we’ll see um.

So, in other words, I’m asked to load that data and that data it’s gon na take some time it’s on the hard drive the gnomes in the computer have to go and like dig into the hard drive and find and pull it back up a draw boom Is happening immediately, so what I need to do is I need to enforce there’s a couple things. I need to enforce that the data is loaded before I start trying to draw with the data and a quick way to do that, which is ultimately not the way that I’m going to show you in all of the videos, but at least we’re getting started. A quick way of doing that is using the preload function, so function preload. You know everything is event based, and you know the events that are happening here in this particular sketch is preload flower dot, JSON uh, oh reload, it’s, the first thing that runs and in everything that in preload, when it finish everything that’s loaded in preload when it Finishes loading setup that runs and then draw runs, so this is a way of guaranteeing that by the time we get to draw that data will be in that particular variable. I hope this works now and you can see it does and you can see. I have my text of the sunflower there on the screen, so a mr. sort of wraps up a kind of very basic start of ok there’s, a low JSON function for what is JSON.

What is the syntax there’s a low JSON function that allows me to load that stuff that’s in the file into a variable? Then I can use the stuff in that file in the same way that I do in just about any JavaScript any p5 sketch that I’ve ever done before. So what do I need? What what’s missing here couple things one is we need to. I think we need to increase the order of complexity of the JSON file, like this isn’t really getting us very far. There’S, not a lot of data here and and this that you’re not usually going to see JSON files that look. This simple they’re going to have tons of information in them every you know, 10. Recent New York Times articles who wrote the article all the comments for each article, an ID for the article. A word count for the article there’s like lots of information and arrays a nested object. So what I want to do in the next video is look at some more complex J’s data and how it might be formatted and how you can kind of do. Some detective work to figure out how to access that data. What I would suggest to you, if you want to do an exercise before you work, go to the next video is pick something that interests you try to make a JSON file for it. Put some data in it see if you can load that data and display something based on that data.

You know I’m sure you can think of something more interesting than just what I’ve done here and something else that I’ll mention which I’ll show in the beginning of the next video is. There is a wonderful github repository what’s good hub – oh my god, what’s good that’s, a tie. I need to have make a video about that, but I don’t know whoops I’m in the wrong place here I’m trying to open something it’s gif oak romesco. I was trying to open this is a github repository maintained by a Darius Kazemi. Hopefully I pronounced his name correctly and what it is is it’s a whole lot of JSON files, all about different topics that people have manually made or pull together from different sources and contributed so let’s, say you’re interested in art. I could click here isms, and this is like a big list of all sorts of like kinds of isms like electrician, lumen, ISM, lirikl extraction ISM. So anyway, I encourage you up and pull it link another place you can do if you’re like don’t, want to feel like typing out your own dataset is go to this repository. Look at the different JSON files. There try to copy paste one of them into your code, see if you can get access to it and I’m going to look at one from this particular set. I won about birds that I have in mind that look at in another example. In other context, then you know this is perhaps a for another time, but you might think about contributing back if you’ve made the most wonderful flowers.

Is there a flowers one in here? Oh it’s, like a flower code, oh yeah, there’s, fireworks. Flowers! Look at this! Ah, this is, I needed this so here’s a list of flowers anyway, up you might make your own data set and contribute it back to this place for other people to use as well. So thanks for watching in the next video I’m going to pull another JSON file is a bit more complexity to it, because that’s going to help us overall we’re on this train, we’re going to get to this point of like we don’t, have this local file we’re.

 
 

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official.arduino
2019-10-02T19:32:52+0000

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2019-10-02T19:08:01+0000

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PBE9lMyV normal - arduino json
contrastive_div
Wed Oct 02 12:12:07 +0000 2019


arduino側はjson-rpcのライブラリあるらしい。

それなら多少はPCとの通信できそうだ。

ontitRzi normal - arduino json
HuanWin
Tue Apr 14 01:19:53 +0000 2009


@lehoczkyescobar @graphrick hmm I have some ideas.. an Arduino with a network shield and some code to make an HTTP POST request. JSON packet carrying the data to a simple backend server, maybe .NET Web API, which has hooks into, idk, Google Sheets API

Zzahid

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Zzahid

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Comment (23)

  1. If someone cant already tell, this dude simply loves coding. I loved how he explained everything. World needs people who love their job as this guy loves. Keep up the good work man way to go.

  2. He is an amazing teacher. I am sort of figuring he doesn’t write a script and rehearse every single video. I suppose he maybe makes an outline of the topics to cover then just goes out and makes the video. Hardly any “ummms” “errrrs” “ahhhs” and other stumbling around on the video. These videos are at the right level for me to follow. Not too advanced, not too basic. I can watch a few minutes of the video, pause the video and try out his examples on my own.

    Kind of glad he wasn’t a telemarketer and called me trying to sell me something. I might own a couple of bridges in Brooklyn, some swamp land in Florida and a nice retirement plot out in the Arizona desert. Plus a couple of life insurance policies.

    1. Aleeza Smith if you’re not using the p5.js library with a live server and you’re using loadJSON() it probably wont work if its something else i cant help you because i’m still a beginner at coding

  3. John 16: 31-33 “Do you now believe?” Jesus replied. “A time is coming and in fact has come when you will be scattered, each to your own home. You will leave me all alone. Yet I am not alone, for my Father is with me. “I have told you these thing, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world.”

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