WEBVTT 00:00.080 --> 00:04.760 Our circuit now contains an LED and we are going to add a push button. 00:04.760 --> 00:09.470 So I will show you step by step exactly what you need to do to add this push button. 00:09.470 --> 00:14.060 And then in the next lesson we are going to control it with Python and the first thing. 00:14.060 --> 00:17.480 So here you can see I'm still on the Raspberry Pi OS desktop. 00:17.480 --> 00:22.070 Make sure first that you shut down the Raspberry Pi okay. 00:22.130 --> 00:26.570 So shut it down and remove the power cable. 00:26.840 --> 00:28.880 So here I'm back on my circuit. 00:28.880 --> 00:32.510 I will first show you with this software and then with the real circuit. 00:32.510 --> 00:33.740 We still have the LED here. 00:33.740 --> 00:35.750 We're not going to touch anything about that. 00:35.750 --> 00:38.000 But we have two new components here. 00:38.000 --> 00:42.650 We have this push button and we also have a one kilo ohm resistor. 00:42.650 --> 00:46.790 So that's the exact same model as we had for the LED. 00:46.850 --> 00:52.730 And once again here, even if you see Raspberry Pi four on my software, it's the same for Raspberry 00:52.730 --> 00:55.490 Pi five, Raspberry Pi three, etc.. 00:55.520 --> 00:59.720 Okay, so the push button, you will see that a push button has four legs. 00:59.750 --> 01:06.900 But actually if I click here this leg on the left is connected to that one, and this leg on the right 01:06.900 --> 01:08.730 is connected to that one. 01:08.730 --> 01:11.820 So in the end you only have basically two connections. 01:11.850 --> 01:12.060 Okay. 01:12.090 --> 01:15.270 So this one is connected to that one and this one to that one. 01:15.300 --> 01:18.780 What I will do is I will put my push button. 01:18.810 --> 01:24.330 Usually what I do is so I'm going to go on the right here, and I put it in the middle like that. 01:24.330 --> 01:28.080 So it's connected to both sides. 01:28.080 --> 01:35.160 Just because if you put it here you see that, then you only have one possible dot to connect something 01:35.460 --> 01:35.670 okay. 01:35.700 --> 01:39.840 If I put it in the middle then I have additional dots okay. 01:39.870 --> 01:41.340 I have more space basically. 01:41.340 --> 01:43.050 So we're going to do it like this. 01:43.050 --> 01:48.750 And now you can see that because of this connection here all the dots in this line are also connected 01:48.750 --> 01:51.060 to all the dots in that line. 01:51.060 --> 01:52.290 So in that column okay. 01:52.320 --> 01:57.420 So this whole column does five and five dots here are connected together. 01:57.420 --> 01:59.430 And the same for that side. 01:59.430 --> 02:03.630 So the first thing I will do is connect the button to the ground. 02:03.640 --> 02:05.620 And you can see we already have the ground. 02:05.620 --> 02:10.210 So the ground is connected from the Raspberry Pi to this blue line here. 02:10.210 --> 02:14.290 So I'm going to take this dot here and connect it to the ground. 02:14.290 --> 02:17.410 And I'm just going to choose a black color. 02:17.980 --> 02:20.650 So why is black here. 02:20.680 --> 02:21.460 All right okay. 02:21.460 --> 02:22.600 We use black for ground. 02:22.600 --> 02:26.230 So then it's much easier not to make mistakes in the future. 02:26.230 --> 02:28.450 And then this is where. 02:28.450 --> 02:31.150 So you can see here I have a full. 02:31.180 --> 02:33.010 So the line is fully connected. 02:33.010 --> 02:37.060 This is where if you have a disconnection in the middle for example here. 02:37.060 --> 02:42.640 So that only applies for those of you who have a long breadboard and it's disconnected in the middle. 02:42.640 --> 02:46.990 Then the ground here is not going to be connected to that side. 02:46.990 --> 02:53.140 So maybe in this case you might want to add an extra wire here if it was disconnected. 02:53.170 --> 02:56.320 Okay I'm going to come back to this on the real circuit. 02:56.350 --> 03:00.880 But if you have a fully connected breadboard like this, you don't need to worry about that. 03:00.880 --> 03:04.300 And then so we have one side of the button connected to the ground. 03:04.300 --> 03:07.040 And I'm going to just connect here. 03:07.070 --> 03:09.470 I'm going to plug a resistor. 03:09.470 --> 03:11.810 So wherever here on the other side. 03:11.810 --> 03:13.850 So I can even put it here if I want. 03:13.910 --> 03:14.180 Okay. 03:14.210 --> 03:14.930 It's the same. 03:14.930 --> 03:16.160 And then I will connect. 03:16.160 --> 03:23.150 So basically I will connect this leg here on the right which is going through a resistor. 03:23.150 --> 03:26.420 I will connect to a Gpio on the Raspberry Pi. 03:26.420 --> 03:31.010 And that's going to be that one Gpio number 26. 03:31.010 --> 03:32.720 And I chose this one okay. 03:32.720 --> 03:34.370 Because it's quite easy to locate. 03:34.400 --> 03:37.400 It's going to be also on the inside of the Raspberry Pi. 03:37.400 --> 03:41.540 And you can see that the first one here, the first pin on the right is a ground. 03:41.540 --> 03:43.940 So that's going to be the second to last pin. 03:44.030 --> 03:50.630 So you're going to connect this one to to that part here. 03:50.720 --> 03:55.970 So to that leg of the resistor I'm just going to make it nicer. 03:59.600 --> 03:59.750 Okay. 03:59.750 --> 04:06.110 So when I export the image for you I'm also going to make it nicer to look at. 04:06.110 --> 04:09.570 And I'm going to change the color here because we don't want black. 04:09.600 --> 04:13.170 And let's use blue for example, because I'm going to use the blue wire later. 04:13.170 --> 04:14.700 But it can be any color you want. 04:14.730 --> 04:15.180 All right. 04:15.210 --> 04:17.340 And that's basically it for the push button. 04:17.340 --> 04:20.880 So we have the ground to one side of the button. 04:20.880 --> 04:27.120 Then on the other side we have this resistor which is basically just here to reduce the current. 04:27.120 --> 04:29.670 That's more like a safety feature. 04:29.670 --> 04:34.320 You might find some circuits online that don't even use the resistor okay. 04:34.350 --> 04:38.640 They just connect the two legs of the push button directly to the Raspberry Pi. 04:38.670 --> 04:43.860 Here I just add this resistor to reduce the current as an additional safety. 04:43.860 --> 04:48.840 And then basically so you see one side is connected to the ground and the other side is connected to 04:48.870 --> 04:50.340 a Gpio. 04:50.340 --> 04:53.370 And now let's go to the real circuit. 04:54.240 --> 04:55.860 So we are on the real circuit. 04:55.860 --> 04:56.940 And as you can see. 04:56.970 --> 04:58.920 So I have just shut down my Raspberry Pi. 04:58.920 --> 05:01.500 I'm going to make sure to power it off. 05:01.740 --> 05:07.890 And just to make it easier for you to see, I'm going to use the same orientation as in the software. 05:08.140 --> 05:09.100 like this. 05:09.100 --> 05:14.050 And then the first thing you might want to do, just in case you have a disconnection in the middle 05:14.080 --> 05:14.290 here. 05:14.290 --> 05:20.020 So I don't have a disconnection, but if you have then you might for example, put one. 05:20.050 --> 05:25.150 You see, take one small black wire, male to male, and then you plug it just like that. 05:25.150 --> 05:30.970 For example, if the disconnection is here, which means that the left part here is going to be connected 05:30.970 --> 05:34.870 to the right part, and then everything is going to be connected to the ground. 05:34.900 --> 05:35.110 Okay. 05:35.140 --> 05:36.850 So that's just in case. 05:36.850 --> 05:39.580 And now I'm going to remove that because I don't need it. 05:39.790 --> 05:42.460 Now what do I have I have my push button. 05:43.090 --> 05:45.820 I have my one kilo ohm resistor. 05:45.850 --> 05:48.700 That's the same as the one we used for the LEDs. 05:48.700 --> 05:54.730 So if you have a doubt about the value and how to pick the color, you can come back to previous videos. 05:54.820 --> 06:01.720 And then I have a small black wire so male to male and I have a here a blue wire. 06:01.930 --> 06:03.070 The color doesn't matter. 06:03.100 --> 06:05.470 Just don't use red and don't use black. 06:05.470 --> 06:08.410 And this one is a male to female. 06:10.160 --> 06:14.150 So I'm going to take my push button and I'm going to connect it here. 06:14.180 --> 06:15.770 While on the right. 06:15.980 --> 06:16.790 Okay. 06:17.090 --> 06:18.380 Just like this. 06:18.650 --> 06:20.480 Between the two parts. 06:20.510 --> 06:21.140 Okay. 06:21.800 --> 06:24.710 Now I'm going to connect the ground. 06:24.710 --> 06:30.770 So let's just take whatever dot here and connect to whatever dot on this blue line. 06:31.340 --> 06:31.670 Okay. 06:31.700 --> 06:36.260 I just make sure that I don't put the wire too close to the button, because what's going to happen 06:36.260 --> 06:38.660 is we are actually going to push the button. 06:38.660 --> 06:40.970 So we're going to need to touch the circuit. 06:40.970 --> 06:45.980 And if you see you have the wire too close or the resistor too close, then you might touch it. 06:45.980 --> 06:47.870 And it's better to avoid doing that. 06:47.870 --> 06:50.120 So I'm just going to plug it here. 06:50.300 --> 06:50.480 Okay. 06:50.480 --> 06:55.280 So I have enough space then to push the button without touching anything. 06:56.540 --> 06:59.060 So that's the left side of the button. 06:59.060 --> 07:03.740 Now on the right side I could plug it here but I'm going to plug it here. 07:03.890 --> 07:06.380 So make sure it's on the same color right. 07:07.490 --> 07:11.190 I'm going to put a resistor and right here. 07:12.750 --> 07:14.670 It doesn't matter where you put it. 07:14.700 --> 07:15.930 Where you put the leg. 07:15.930 --> 07:20.520 It just matters that it's a colon with no other components. 07:21.930 --> 07:23.310 So just like this. 07:23.310 --> 07:27.180 And then I will connect this side of the resistor. 07:27.210 --> 07:34.350 So here for example to the second to last pin on the Raspberry Pi. 07:34.380 --> 07:38.430 So from the bottom right which is that one. 07:42.000 --> 07:42.600 Okay. 07:42.630 --> 07:47.010 So now it's looks like it's in. 07:47.040 --> 07:47.490 All right. 07:47.490 --> 07:48.450 So just like that. 07:48.600 --> 07:51.210 So now on the Raspberry Pi we have the ground here. 07:51.390 --> 07:57.780 We have the, uh, first LED and then we have the button right here. 07:58.500 --> 08:01.110 And our circuit is now finished. 08:01.140 --> 08:04.260 What you can do now is you just pull it on. 08:04.260 --> 08:09.390 So if you have removed the SD card because you don't have a case, you put it back and then you can 08:09.390 --> 08:11.580 power on the Raspberry Pi.