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Using my python, it is possible to control the frequency of the C.P.U clock of your is 32 and that

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is very easy.

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Yes, you're about to see now.

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Why would you want to do something like that?

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The best example I can come up with is to reduce the power consumption of your AHP 32, which is particularly

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useful when you are running your E.S.P 32 powered gadget of battery.

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I'm going to demonstrate how much savings you can achieve by reducing the frequency of your sleep use

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clock by half or even by a quarter.

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So what I've got here is a simple example where I've got an infinite loop and I get my ability to move

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from it's full speed, which is 240 megahertz clock speed to 180 megahertz and even down to 40 megahertz

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of clock speed.

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And at each step, each operational sebu frequency, you'll see that the current rule from my power

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supply will be dropping accordingly.

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I'm going to do this experiment in two parts.

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First time I'm going to run.

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This experiment is going to be just by running a regular program onto my E.S.P 32, which is this program

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right here.

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I've got an infinite loop and inside the loop I'm first setting the CPU frequency to a particular frequency

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going to cycle between two hundred forty megahertz, eighty megahertz and forty megahertz.

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And then I'm going to use machine don't freak for frequency to read the current operation of frequency

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and printed onto the shell.

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And at each step I'm going to stay there for five seconds, give enough time for the current trial to

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stabilize so that I can read it once.

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I'm happy that this script works.

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I'm going to say that as boot dot p y and then I'm going to power my 32 externally from my benchtop

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power supply.

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And that is going to give me the ability to also read the current drill by looking at my power supplies

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current display.

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Now you can find more information about what I'm about to do here.

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I'm looking at the documentation of board control and under general board control here you'll see that

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there's an example of how you can use the two methods.

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Frequency of freq allows you to get the current frequency of the U.S. military to see Beauclerk.

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And this is how the strategist parameter of the frequency desired frequency in Heard's, and that will

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allow you to set the frequency.

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All right.

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So I want to be connected.

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I am going to first upload.

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The script just clicked on stop just to get the show and prepare the device for the upload.

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So now I'm going to run it and you can see 240 forty.

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So this 240 megahertz, 80 megahertz for another five seconds.

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And 40 megahertz is going to go back to.

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Two hundred and forty megahertz.

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All right, just stop it and.

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Bring up the files menu and I'm going to create a new file here.

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I'm going to copy this code just a bit here.

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Taste it in here.

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And I'm going to call that.

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butI y.

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And I think that he will be all right now when I restart the program.

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It will automatically run whatever code I have in.

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But don't he?

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Why?

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All right.

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So then I'm like the USB cable.

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And that's important because you don't want to be powering the PS3 32 using USB plus an external power

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supply.

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So the USB is now disconnected content on my power supply.

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So I've said it to three point three volts.

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Some power supply is stable, so it is safe to use.

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I'm going to plug the black cable coming from the power supply onto the ground power rail and then the

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red one will go to three point three volts pin right there.

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Just remember that the three point three volts pin does not provide voltage regulation.

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There's no voltage regulator on the three point three pin.

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If you don't have a three point three volt stable power supply, then you can also try out at the five

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volt pen.

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So of course you will need to change your power supply to five volts or a little bit more.

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And this pin does regulate power or voltage does regulate voltage and therefore it's a safer pin to

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use.

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But you do have a little bit of wasted energy on the voltage regulator.

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And that is why in my test, I prefer to go for the three point three volts and that would give me a

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good indication of what is the power consumption, I should say actually to be more exact current draw

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at each frequency setting.

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So I'm going to turn on the power supply now and just look at this number here at the amperage to see

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how much current draw we get at each frequency setting.

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We're not going to be able to see the output, of course, because we are not connected to the shell.

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But you'll be able to see how the temperature drops from two hundred and forty megahertz operation down

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to 40 megahertz.

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Let's have a look.

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So we now own.

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So that's two hundred and forty megahertz.

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That's 80 megahertz.

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And 40 megahertz.

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So the one who cycle.

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Two hundred and forty megahertz.

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80.

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And 40.

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She can see the difference in amperage and the current draw is quite noticeable between the three levels

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or the three steps in the clock's frequency.

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So this is one easy way to.

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Reduce the power consumption of your ISP 32, especially if it's doing something that doesn't really

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require a high clock rate.

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Another thing that you can do to reduce power consumption considerably is to put the 32 into deep sleep.

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That's a capability that is available to us through micro python.

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But, of course, a different lecture where I demonstrate how to do that.

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All right, now remember that you've got the wi fi or with code in it running, if you don't do anything

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at this point, then every time that you start your ISP 32 or you power it up, the Wi-Fi and the code

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in it will execute.

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And of course, we probably don't want that to happen.

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So there's a couple of things that you can do here.

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First of all, I'm going to switch off my power supply and connect my ears to back to my.

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Computer fire, USP.

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All right, so we're back.

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Let's get Michelle working, so as soon as I powered up my opportunity to buy a USB be, the script

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would would normally start running.

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So I'm going to click on this top restart back and button.

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A couple of times to get.

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My is Peter to back onto the show.

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And I'm also hearing controversy.

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So I've got my boot IPY there, the script has stopped running.

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I just typed control see to make that happen.

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And I'm now going to either totally delete the script, which would be better, or alternatively, if

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you want to delete it, just undo.

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You can just use the tactics.

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Three tactics on top and three back takes in the bottom in order to comment out this whole block of

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content.

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More of the script in case you want to use it a bit later.

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So in either case, you want to make sure that there's nothing left that is executable inside the boot

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dot p y script they saved on the device.

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Now, if I I'm going to press on this pattern here to reset, you'll see that I'm going straight into

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the prompt of the show, which means that nothing is executing.

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So at this point, I can go on.

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And work on my next experiment.