WEBVTT 00:00.180 --> 00:06.810 Now that you understand how analog input pins work, let's actually make some tests with our newly installed 00:06.810 --> 00:11.370 potentiometer so you can open here a new sketch on your Arduino ID. 00:11.520 --> 00:20.370 And, well, first things first, as always, we are going to use define for the PIN number we use for 00:20.370 --> 00:25.500 the potentiometer, and we are going to name it very simply, potentiometer. 00:27.380 --> 00:34.310 You know, all the bouquets and then the number of the pin is a two, so you can write a two. 00:34.550 --> 00:40.910 This is not a proper integer number, but this is something that is recognized by the Arduino. 00:41.240 --> 00:43.130 This is in the library. 00:43.160 --> 00:48.380 So you can use a zero, a one, a two until a five here for the Arduino UNO. 00:48.680 --> 00:51.260 It will be recognized as the PIN number. 00:51.710 --> 00:54.380 All right, then what do we need to do in the setup? 00:54.410 --> 01:00.770 Well, usually what we did before is to use the PIN mode function to set up the mode so either input 01:00.770 --> 01:02.740 or output for the pin. 01:02.750 --> 01:10.280 But if you remember from the previous lesson or analog input pins, we don't need to do the pin mode 01:10.280 --> 01:14.270 function because they are already analog input bits. 01:14.570 --> 01:18.440 So the pin is already input, so the pin already has the input mode. 01:18.440 --> 01:20.980 So nothing to do in the setup. 01:20.990 --> 01:24.560 Just what I'm going to do is say that begin. 01:24.920 --> 01:26.510 Okay, because we are going to print. 01:27.730 --> 01:32.830 The value from the potentiometer on the style monitor so we can actually monitor it. 01:33.100 --> 01:33.520 All right. 01:33.520 --> 01:39.610 I know in the loop function, what we are going to do is simply to print the value from the potentiometer. 01:39.610 --> 01:41.560 So still that. 01:42.250 --> 01:43.180 Praying to them. 01:44.760 --> 01:50.610 And then to read the value from an analog input pin, you will simply use the function analog. 01:51.620 --> 02:00.030 Read with, of course, the pin number so we can replace with potentiometer pin here. 02:00.210 --> 02:03.020 Now close to parenthesis and the semicolon. 02:03.320 --> 02:09.380 And then so we don't print too fast, I'm going to add a delay of 100 milliseconds. 02:09.380 --> 02:14.420 So we are going to print the value from the potentiometer at about ten hertz. 02:14.630 --> 02:19.160 Now, as you can see, this is very, very similar to what we did with the push button. 02:19.550 --> 02:25.970 With the push button, we simply printed the value from the button using digital read, but with the 02:25.970 --> 02:30.110 potentiometer, because this is an analog input pin, we use analog rate. 02:30.110 --> 02:37.100 So the name of the function here is very simple and analog read will give you a value between zero and 02:37.100 --> 02:38.780 1023. 02:38.810 --> 02:39.920 Let's check that. 02:39.920 --> 02:46.670 So make sure now your board is correctly connected and let's upload code. 02:46.670 --> 02:47.450 Let's name it. 02:48.450 --> 02:49.380 Put on your mirror. 02:53.210 --> 02:58.260 And now let's open the sale monitor to see what value we have. 02:58.280 --> 03:04.010 And as you can see here, so we have the first value, which is 590. 03:04.520 --> 03:10.950 This is just because the potentiometer here is at a certain position between the minimum and the maximum. 03:10.970 --> 03:15.230 Now, I'm going to move it from one side here. 03:15.680 --> 03:18.560 So I move it and you can see the value is decreasing. 03:19.040 --> 03:23.180 I move it all the way up, all the way down to zero. 03:23.180 --> 03:29.510 And though I can move it the other way all the way up to 1023. 03:30.020 --> 03:36.920 So depending on your setup, the minimum and maximum value may be inverted from my setup. 03:36.920 --> 03:44.870 But the important thing is that you can go from 0 to 1023 and back to zero, and then you can have any 03:44.870 --> 03:47.060 intermediate value between them. 03:49.620 --> 03:57.480 And one other nice thing you can see is with this soil plot, you will be able to plot the value from 03:57.480 --> 04:00.060 0 to 1023. 04:01.290 --> 04:07.500 You can make a nice plot, so you can better visualize what is the value. 04:08.280 --> 04:08.880 All right. 04:09.710 --> 04:15.200 This is nice to have, but not really needed for what we need to do in the following of this course 04:15.200 --> 04:17.090 and also for the final project. 04:17.120 --> 04:17.450 Great. 04:17.450 --> 04:20.150 So now you can read a value from the potentiometer.