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Hi and welcome to a new section in this course, this section is the first one where I'll be doing practical

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demonstrations and showing you how to use micro python with a variety of peripherals.

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And of course, we'll start with the classic blink example in this and in the next lecture.

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Just a couple of things before we begin since, as I said, it is the first practical demonstration.

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Just want to talk to you a little bit about how I've set up these experiments, both on the hardware

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side and in terms of the software that we're using.

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So on the hardware side, to begin with, I'll be using just a generic SB 32 board.

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This one is the one with the 19 pins on each side.

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There's nothing special about this board is a cheap one that I found on eBay.

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It is a generic SB 32, and that's how you'll find it as well in Thony when you download and install

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the firmware.

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I'm not using external flash or anything like that now for my peripherals.

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I'm using too many boards attached, one next to each other.

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So I've got double the amount of space.

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And you can see here that I have wired the power rails to the three point three volt pin.

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So this pin right here and the ground pin and I've just taken those pins and connected them to the to

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the ground rail and to the three point three fourth rail and again with wires, I've connected the additional

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two power rails.

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Also, whenever possible, I will be using a sticker here with the number of the pin to which a component

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like Enilda or later on a potential on that or a button is connected to.

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So that all you've got to do is to look at any video frame and you'll be able to see where a particular

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component is connected to.

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So having said all that, I'm going to like in my ears to back onto the boards and connect.

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Legazpi Cable.

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All right, let's have a look at what's happening on the software side.

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So in general, each experiment I'll be starting with thrown in a blank slate like this, nothing is

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loaded.

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You can see that I've got typically my scripts in a local directory and then you can navigate inside

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thony.

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You can navigate the directory where you have downloaded the scripts from the courses GitHub repository

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to in most cases, like in this case here.

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I'll be opening up the example script, having a look around, just become familiar with the way that

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it works.

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And then I will be there's a couple of ways to copy the script onto your ISP.

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Three to one way is to open up a new file, then copy the contents of the local file onto the new file,

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and then from here you can save it to your ISP for it to do that in a moment.

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Another way by which you can do that, you can close that another way by which you can do that is to

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go to file and then say save a copy.

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And then again, as long as your 32 is connected, then it's going to give you an option to save the

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copy on to the device or on to your local computer file system.

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So let's have a look at those.

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You can see that Mike is referring to is connected via USB, but it's not appearing yet in Sony.

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So I'm going to click on this button here just to trigger the connection of the device.

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And now it's a simple by default, when you upload the firmware for microprobe and onto your especially

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to the only file present is the boot p y file, which looks like that it doesn't do anything in general.

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I'm not going to be doing anything with dot p way because I want to be able to click on the run current

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script button up here, hit F5 to arbitrarily execute a Python script that is stored on my ISP 32 instead

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of having two power cycle in order to trigger whatever code is inside.

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But P y.

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But just remember that once you are happy with the operation of a script, then you can always change

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that script name to be P y and then you'll be able to execute it just by powering up your ISP 32.

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Alright, right.

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So now that we have the ISP 32 micro python device connected and you can see the listing of its file

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system here inside thony, then I can go ahead with step number two and copy my script across to the

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East 32.

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So I'm going to follow the copy method.

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So I'm just going to say save copy and then choose from a Python device and I'll give it the same name.

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I'm going to type it in and give it the same name as the name that the file is saved on my local computer

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file system.

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So this is really the blink or 21. P why right now it appears right here going to double click on it

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to open it up.

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And here's my second tab with my Python script as it is saved on my ISP through to device and to highlight

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the difference in storage location between the two files, you can see that the local file system computer

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file system file does not have the square brackets around its file name while the ISP three to one or

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the file that is stored on the ISP three to filesystem per square brackets around its file name.

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So now you can get rid of the local file system, copy of the file and just work with the one that is

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stored on the ISP three two.

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With each one of the demonstration files, I tried to provide sufficient documentation in its header.

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So in general the header will look like this is going to have the number title for the script in the

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demonstration, a description of what it does, a listing of its components and then the documentation.

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So here we are using the PIN and the Slocum's function so you can find documentation about those two

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in the rules that are provided here.

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And in the case of the sleep function, for example, which is quite interesting, you click on this,

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you are or you copied across to your browser and it will take you to the appropriate part of the macro

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python or documentation side.

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Now, this function is interesting because this is the regular python or C Python time module.

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It's got the you in.

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In front of it to indicate that this is a micro python version of the time module and the difference

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between the full C Python time module and the new time module is that the module is optimized to make

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it work better, more efficiently on a micro python device.

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So it's missing a few functions.

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It's a bit more efficient in terms of memory usage and therefore will be using your time instead of

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time to introduce a delay, as you can see here of QWERTY while Loop and I've got a delay here to get

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the ability to blink on and off as similarly with the pins GPO server.

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Look, I'm going to use it especially to part of the documentation for this.

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And you can see that here as Pins and KBIO.

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And this is an example of how to use pins in the security of using micro python to be able to turn them

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on and off.

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We can also see how you can turn on the pull up resistor.

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We've been making use of this function in a later example, led a lecture in this section.

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So here you learn that you can turn on a bill just by calling the function of the PIN object.

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Here we've got a PIN object called P0 and that's how you create this object.

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You can turn it off by calling the function or you can use the value function and pass a one or a zero

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to it to turn it on and off.

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You can also check for the current value of a bill.

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We're going to show you how to use it in the very next lecture here.

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But it's a very convenient for you to see whether the GPA stand on and off without having to keep track

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of its state in an additional variable.

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So you can see there's a few ways by which you can manipulate the process using micro python on an E.S.P

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32.

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Of course, you use the same techniques to achieve the same kind of functionality on other market python

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devices like the Raspberry Pi Pekoe, for example.

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Or add back to a sketch.

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Again, it's pretty simple.

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All we do is to import the PIN functions from the machine module, the slip on the school.

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And as for microseconds from the time module, you can also import sleep instead of sleep image.

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And then we'll be talking about seconds instead of microseconds.

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Personal preference here, which one you want to go with creating then the ality object which represents

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the ality connected to your 21 and this is an output pin.

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And then the method that I'm using this example is to just use a loop, which is very similar to how

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you do this on an arduino and then turn on the ALYDA sleep for five hundred milliseconds and turn it

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off, sleep for another five hundred milliseconds, etc..

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If you had chosen to import sleep instead of sleep and this, then this function here would look like

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this.

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And if you wanted to have a five hundred millisecond or half a second delay, you would just use decimals.

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You'd go like that.

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So this would be half a second.

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Let's go back to the original.

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With the emphasis now, instead of saying early on or off, you could also say ality taught value one

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or ability to add value zero, whichever you prefer, is fine.

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All right, so I'm going to save that totally saved and click on the play button here or hit F5 on your

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computer to upload this script and.

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As you can see, it works.

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No problems at all.

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OK, so this was quite easy now in the next lecture, I want to show you an alternative way of getting

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this reality to blink.

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But in this alternative case, instead of using the loop like we did here, we are going to use a timer,

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which, as you can imagine, is a much more efficient way to use the resources of your.

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I could literally just go right ahead and have a look at this kwatinetz scenario.