WEBVTT 00:00.080 --> 00:06.650 Now that we have our RGB led on the circuit and correctly working, let's add a push button. 00:06.650 --> 00:09.800 So here you will see that it's going to be very simple. 00:09.800 --> 00:17.660 So you find a push button here on the right, you take the push button and you are going to put it somewhere 00:17.660 --> 00:20.570 here in the middle of the breadboard. 00:20.570 --> 00:22.670 That's what I usually do. 00:22.670 --> 00:27.080 And then, well, we will need to add some connections to that push button. 00:27.080 --> 00:30.110 So first we will need to add a connection to the ground. 00:30.110 --> 00:33.680 And for that I'm going to add also a resistor. 00:35.000 --> 00:36.410 Register here. 00:36.440 --> 00:44.090 Let's so let's directly connect, for example, the leg on the right here to the ground and let's choose 00:44.090 --> 00:46.550 a ten kilo ohm resistor. 00:46.550 --> 00:51.740 So that's going to be brown, black and orange for a four band resistor. 00:51.740 --> 00:58.670 And that's going to be brown, black, black and red for a five band resistor. 00:59.000 --> 01:02.660 So this resistor will act as a pull down resistor. 01:02.660 --> 01:08.910 So basically with this, we can make sure that the purge button state will be low or basically zero 01:08.910 --> 01:10.280 volt by default. 01:10.280 --> 01:15.890 And when we press on the purge button, the state is going to be high or five volt. 01:15.920 --> 01:16.160 Okay. 01:16.160 --> 01:22.460 So that's very important to either use an external resistor or use the internal pull up resistor of 01:22.460 --> 01:26.780 the Arduino, which is going to do the opposite, which means that the state is going to be high by 01:26.780 --> 01:29.450 default and low when you press on the purge button. 01:29.750 --> 01:30.110 All right. 01:30.110 --> 01:32.030 So we have the connection to the ground now. 01:32.030 --> 01:38.190 So if the connection to the ground is on the right side here, the left side is going to be connected 01:38.190 --> 01:40.290 to five volt. 01:40.290 --> 01:43.590 And I'm going to use right here because that's five volt connection. 01:43.860 --> 01:44.220 Okay. 01:44.220 --> 01:48.480 So the push button is now correctly connected to five volt and ground. 01:48.480 --> 01:52.380 And now we are going to add a connection to a digital pin. 01:52.380 --> 01:56.430 So you take the side, okay, which is also connected to the ground. 01:56.430 --> 02:05.130 And from the same line here, you take a wire and let's connect to PIN number seven here. 02:05.130 --> 02:07.170 So I'm going to add double click here. 02:07.470 --> 02:08.820 I'm just going to do this. 02:10.320 --> 02:11.820 To make it nicer. 02:14.940 --> 02:15.330 Okay. 02:15.330 --> 02:15.930 Like this. 02:15.930 --> 02:17.910 And let's choose. 02:17.940 --> 02:18.320 Okay. 02:18.330 --> 02:19.170 Pink, for example. 02:19.530 --> 02:27.180 So from the same side as where you plugged the resistor here, you're gonna put a wire to pin number 02:27.180 --> 02:27.790 seven. 02:27.810 --> 02:29.730 Okay, so we won't use interrupt here. 02:29.730 --> 02:32.460 You can choose any pin you want. 02:32.490 --> 02:33.720 It doesn't really matter. 02:33.750 --> 02:34.140 All right. 02:34.140 --> 02:35.580 And the circuit is done. 02:36.240 --> 02:44.310 And here is the physical circuit with the push button that I've added also alongside with the RGB led. 02:44.550 --> 02:48.750 So here you can see we have the push button on the middle of the breadboard. 02:48.750 --> 02:54.740 And then on the left I have this wire, this red wire to the five volt line here. 02:54.750 --> 03:01.890 And then on the right side, I have this resistor, this ten kilo ohm resistor connected to the ground. 03:01.890 --> 03:08.010 And then a wire from the same line here connected to digital PIN number seven.