1 00:00:04,000 --> 00:00:05,000 Hello friends. 2 00:00:05,000 --> 00:00:13,000 Today I will tell you how to read Digital signal using Visa. 3 00:00:14,000 --> 00:00:21,000 In this case I'm using Arduino hardware and one LDR sensor. 4 00:00:22,000 --> 00:00:27,000 It will detect light and according to light it will generate signal. 5 00:00:27,000 --> 00:00:36,000 As you see, when I put my hand over this LDR over here, board module Led goes low, so this is how 6 00:00:36,000 --> 00:00:38,000 it will generate signal. 7 00:00:38,000 --> 00:00:44,000 So right now in this module we have VCC ground and one output pin. 8 00:00:44,000 --> 00:00:50,000 So VCC ground are connected to VCC, connected to the five volt ground is connected to the ground on 9 00:00:50,000 --> 00:00:58,000 board Arduino and this pin output pin is connected to the digital PIN number eight. 10 00:00:58,000 --> 00:01:02,000 So now go to the software part over here. 11 00:01:02,000 --> 00:01:09,000 I have the Arduino code as you see in this, I just use a variable LDR one. 12 00:01:09,000 --> 00:01:20,000 I just connect it or assign a digital pin eight then int variable variable name is one, then void setup 13 00:01:20,000 --> 00:01:25,000 Serial.begin baud rate 9.600 Pinmode. 14 00:01:25,000 --> 00:01:33,000 In this case the pin is LDR one and the pin mode is input then void loop. 15 00:01:33,000 --> 00:01:38,000 Then over here I just go to the variable. 16 00:01:38,000 --> 00:01:40,000 It will still read. 17 00:01:41,000 --> 00:01:43,000 And read from one. 18 00:01:43,000 --> 00:01:51,000 If variable one is high when it is high, it will print serial write a. 19 00:01:52,000 --> 00:01:54,000 Else it right be okay. 20 00:01:54,000 --> 00:01:56,000 So this is the code for Arduino. 21 00:01:56,000 --> 00:02:05,000 Now just burn this code into the Arduino, select your Arduino board, then select your port. 22 00:02:06,000 --> 00:02:10,000 My com port eight is there now just run it. 23 00:02:11,000 --> 00:02:15,000 Directly click on upload. 24 00:02:16,000 --> 00:02:17,000 Uploading is done. 25 00:02:18,000 --> 00:02:20,000 So now I just close this. 26 00:02:20,000 --> 00:02:30,000 I just go to the LabVIEW code Over here in this lab code, there is some change from my previous lecture. 27 00:02:30,000 --> 00:02:33,000 As you see over here, I have Visa configure serial port. 28 00:02:33,000 --> 00:02:40,000 You can find this one in serial configure port over here. 29 00:02:40,000 --> 00:02:43,000 This is the serial configure port. 30 00:02:43,000 --> 00:02:48,000 Then you just need to convert bytes to port bytes at port. 31 00:02:50,000 --> 00:02:55,000 So again, you just go to the serial over here bytes at serial port. 32 00:02:55,000 --> 00:02:58,000 It will read bytes at serial port. 33 00:02:58,000 --> 00:03:01,000 So you need to just drag and drop this. 34 00:03:01,000 --> 00:03:06,000 Just make its label visible. 35 00:03:08,000 --> 00:03:09,000 It is my property node. 36 00:03:10,000 --> 00:03:12,000 Then over here, this is my visa. 37 00:03:12,000 --> 00:03:14,000 You just need to connect. 38 00:03:15,000 --> 00:03:21,000 Source to source error into error out and over here byte port to the visa read. 39 00:03:21,000 --> 00:03:24,000 In this case I'm just using visa read function. 40 00:03:24,000 --> 00:03:26,000 I just label it. 41 00:03:26,000 --> 00:03:32,000 I just make it large for you so that it is readable. 42 00:03:33,000 --> 00:03:35,000 Control you. 43 00:03:37,000 --> 00:03:40,000 So as you see over here. 44 00:03:41,000 --> 00:03:46,000 So it will read my bytes available at the given port. 45 00:03:46,000 --> 00:03:47,000 Over here. 46 00:03:47,000 --> 00:03:50,000 I'm just using delay of 10s. 47 00:03:50,000 --> 00:03:52,000 If you are not using this, I just show you. 48 00:03:52,000 --> 00:03:53,000 What happened. 49 00:03:54,000 --> 00:03:59,000 So over here, this function is my string length subset. 50 00:03:59,000 --> 00:03:59,000 String. 51 00:04:02,000 --> 00:04:05,000 So over here, I got the different values. 52 00:04:05,000 --> 00:04:07,000 A series of values. 53 00:04:07,000 --> 00:04:09,000 And I want just only one value. 54 00:04:09,000 --> 00:04:15,000 When this value is equal to a, it will turn on my l d r. 55 00:04:15,000 --> 00:04:17,000 Okay, then close. 56 00:04:17,000 --> 00:04:19,000 Okay, so this is my function. 57 00:04:20,000 --> 00:04:24,000 So now I just hit on run button. 58 00:04:24,000 --> 00:04:26,000 Let's see what happened. 59 00:04:27,000 --> 00:04:31,000 So before it you just need to set your port also. 60 00:04:34,000 --> 00:04:37,000 Or here in the visa resource name. 61 00:04:42,000 --> 00:04:44,000 The port is on port eight. 62 00:04:45,000 --> 00:04:46,000 I hit on run button. 63 00:04:47,000 --> 00:04:59,000 As you see, our hair comes directly When I just put my hand a finger over LDR, it will generate a 64 00:04:59,000 --> 00:05:00,000 Led goes high. 65 00:05:03,000 --> 00:05:08,000 So this is how it will read serial signals. 66 00:05:09,000 --> 00:05:11,000 Okay, Using Visa. 67 00:05:11,000 --> 00:05:12,000 Now, just stop it. 68 00:05:13,000 --> 00:05:18,000 In this case, when I just remove this one, let's check what happened. 69 00:05:19,000 --> 00:05:20,000 I again hit on run button. 70 00:05:22,000 --> 00:05:25,000 Signal is changing, but it is not showing. 71 00:05:25,000 --> 00:05:27,000 It is very fast. 72 00:05:27,000 --> 00:05:28,000 Okay. 73 00:05:28,000 --> 00:05:33,000 So it is not visible for bear eyes to check what happened. 74 00:05:33,000 --> 00:05:37,000 But in between LDR goes high for some seconds. 75 00:05:37,000 --> 00:05:44,000 So in this case I just again bring my delay. 76 00:05:45,000 --> 00:05:46,000 It is ten milliseconds. 77 00:05:46,000 --> 00:05:47,000 Okay. 78 00:05:47,000 --> 00:05:55,000 And if you want to also check what is the output of this substring, I just create control over here, 79 00:05:57,000 --> 00:05:59,000 not control indicator over here. 80 00:06:00,000 --> 00:06:01,000 It will generate signal for me. 81 00:06:02,000 --> 00:06:05,000 Over here I get a series of data like Bvb. 82 00:06:05,000 --> 00:06:09,000 And over here I just only one data because my length is one string. 83 00:06:09,000 --> 00:06:10,000 Subset length is one. 84 00:06:11,000 --> 00:06:12,000 So when I hit on run button. 85 00:06:14,000 --> 00:06:15,000 As you see over here. 86 00:06:15,000 --> 00:06:22,000 I got B when I just put my hand, I got a and my head goes high. 87 00:06:22,000 --> 00:06:32,000 So this is how you can read digital signals using visa with the help of or you can interface any signal 88 00:06:32,000 --> 00:06:42,000 or any sensor with your Arduino or any hardware device and you configure your LabVIEW using Visa to 89 00:06:42,000 --> 00:06:44,000 read this serial signal. 90 00:06:44,000 --> 00:06:46,000 So this is all about today's lecture. 91 00:06:46,000 --> 00:06:47,000 Thank you.