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Hi and welcome to a new section in this course, what we do in this section is to get our construction

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of the terrorism patrol a step further from the breadboard and the simulated inputs and outputs, as

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we've been doing so far.

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I remind you that up to now, instead of using the actual sensor for the soil humidity, I've been using

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a potential mirror and instead of an actual pump, we've been using a DC motor.

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So in this lecture, I'm going to walk you through the modifications that have made to my circuit and

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how I'm using now the actual terrarium and the water container with a pump immersed in it.

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When we walk you through the circuit and see the changes that have made.

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And then in the next lecture, we are going to test this set up and see how it works in real life.

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So let's have a look at the modifications I've made to the circuit.

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Let's start with the motor and the pump.

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Instead of using the Holby five Volt motor that we've been doing so far to do the testing, I have replaced

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it.

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With an actual water pump, so this is the water pump and from the camera here, I'm going to jump in.

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You can see that I've got the pump immersed in water, this is just the jar that I've got of the kitchen

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and I just connected the pump to a hose like this.

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This is about four millimeters in diameter, internal diameter, that seven millimeters the outer diameter.

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And just use this photograph of this.

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And I've just connected the hose to the top outlet of the pump in this particular kind of pump.

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The water comes in from this side and from this opening and then it comes out of this opening to the

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hose will go on this side like that.

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So just attach that and then for power they lead.

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That comes with the pump.

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It's actually fairly short.

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So I extended it so that can reach the power screw terminals on my report right there.

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Just you a.

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All right, so nothing special about the water pump in terms of the job itself.

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I'm just going to rearrange things a little so you can see the top of this job.

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It's just a job with a metal top.

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And I've just drilled a couple of holes that are big enough for the hose and for the power wires to

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come out of in a to just keep it and closed at all times since I've been working on my bench.

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So it gives me a little bit of additional protection and keeps in case I took the job and spill the

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water on my desk.

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Not a good idea.

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So that's all about the pump.

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Now let's have a look at the soil humidity sensor for the soil humidity, since originally I just remind

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you, I had.

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The potential medal attached on my Bridport like this, and then because I am planning changes and I'm

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planning to continue the development of my prototype with the breadboard, I will want to put my potential

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back on the breadboard.

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So instead of rearranging the jumper wires on the breadboard to accomodate the soil humidity and break

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out this device here, I just use a jumper wire to break out the row of columns where this orange wire

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connects to the wire on the breadboard a bit further to the right, and then provided a ground and power

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to the breakout.

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So I'm just going to plug it in like this.

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Make sure that I've got the right the right location like that, and then when I want to continue using

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my potential, they're just going to plug this one out and plug in my potential mirror right here.

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I'll be able to continue working to get this right with one hand.

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Like that, and then I'll be able to use that to the Tumelo.

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All right, so for our test that's coming up in the next lecture, I am simply going to plug in high

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humidity sensor like except now this humidity sensor comes in two parts.

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The first part is the sensor itself.

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Which you simply stick into the soil and I've got it right here in the NEWSROOM in.

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To the terrariums, take a closer look.

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All right, sir, you can see the sensor in the soil like that, right?

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And then again, it comes with a fairly short.

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Why you so I had to extend it to make sure that can reach all the way to where the breakout is, this

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breakout contains an amplifier.

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That's all there is to it.

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And it also has a particular mirror here and it's got both analogue and a digital output.

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Having a look at the breakout from the front that there is keeping this ground, then this pin here

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is digital output and you've got the analog Atwood here and only using the analog output.

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But the digital output allows you to send a one four five zero or higher or no signal to your microcontroller.

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So instead of sending the actual analog value for the sensor, you just sent them on and off.

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And you can calibrate when the sensor goes on or off by turning the knob of the consumer up on board

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the breakout.

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So I'm not connecting anything to digital output.

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I'm just going to use the analog output as I do with the buttons.

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You can control the on and off set of the pump through my work.

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All right.

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So that's all there is to it.

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Let's move on to the next lecture where we'll do a test of our terrariums set up.