WEBVTT 00:00.110 --> 00:06.110 This is step number nine of the final project, and that will be the last step where we write Python 00:06.110 --> 00:06.760 code. 00:06.770 --> 00:10.460 After this, our Python program is going to be complete for this project. 00:10.460 --> 00:17.690 And so what we still need to do now is to handle the deny the deny comment from Telegram. 00:17.840 --> 00:25.430 So when we have an open door request, we can deny so that we don't open the door and we print an error 00:25.430 --> 00:26.900 message for the user. 00:26.900 --> 00:31.550 And as you will see, this step is going to be quite quick and quite easy now because when all the hard 00:31.550 --> 00:32.840 work was done before. 00:32.840 --> 00:37.790 So now we just need to add one functionality on top of what we have done. 00:37.820 --> 00:39.770 I'm going to also do new. 00:42.140 --> 00:45.110 And just paste that here. 00:46.480 --> 00:49.480 Uh, let's remove the lines we don't need here. 00:52.940 --> 00:56.410 Just one here and let's name it. 00:56.420 --> 00:58.670 So let's save it as. 01:01.930 --> 01:02.710 Intercom. 01:03.790 --> 01:05.170 Step nine. 01:06.130 --> 01:10.300 So what we need to do now is to add a callback for the deny command. 01:10.330 --> 01:12.040 We already have the updater. 01:12.580 --> 01:16.290 Everything is correctly set up, so we don't need to do that again. 01:16.300 --> 01:19.640 We just need to create here another callback. 01:19.660 --> 01:28.990 So after the open, for example, the deny access handler a date and context. 01:30.540 --> 01:36.300 But pass And let's add let's not forget that because if you forget, that's of course not going to work. 01:36.330 --> 01:45.990 Dispatcher Dot add Handler Command handler with deny. 01:46.230 --> 01:48.800 Okay, let's check again. 01:48.810 --> 01:50.040 We ask for deny. 01:50.070 --> 01:53.220 So let's get exactly deny. 01:53.910 --> 02:03.570 And the function is going to be deny access handler and I'm going to come back to the run async just 02:03.570 --> 02:04.410 in a second. 02:04.800 --> 02:09.090 So what do we want to do in this deny access handler? 02:09.120 --> 02:14.760 Well, first, what we don't want to do is to open the door so we're not going to send open door and 02:14.760 --> 02:16.590 we are not going to send close door. 02:16.940 --> 02:17.220 Okay. 02:17.220 --> 02:21.840 So because Well, I have put some print here, so let's do print. 02:22.990 --> 02:25.840 Denying access. 02:26.940 --> 02:31.590 And to deny the access we do send to Arduino. 02:31.590 --> 02:40.380 So we're going to send something for the LCD screen, a sound and also put the Led to read. 02:41.340 --> 02:43.080 Okay, So let's put three. 02:43.980 --> 02:52.230 The first command is print text access denied. 02:53.580 --> 02:58.950 And then the second one is going to be play buzzer. 02:59.310 --> 03:02.670 So this time we can use, let's say 200. 03:02.670 --> 03:06.360 So we have 300 here for 500 milliseconds. 03:06.360 --> 03:10.080 So half a second here, when we close the door, we have 200. 03:10.080 --> 03:14.160 So that's lower pitch with half seconds. 03:14.190 --> 03:19.590 Now we are going to send also 200, but for one complete second. 03:19.980 --> 03:25.080 Okay, you can experiment with different frequencies to find what you like best. 03:25.080 --> 03:25.500 Okay. 03:25.650 --> 03:36.520 I'm just going to keep things simple here and set led with 255 zero and zero. 03:38.440 --> 03:38.770 Okay. 03:38.770 --> 03:42.700 After we send those commands, we're going to wait a few seconds. 03:42.730 --> 03:43.600 Time.sleep. 03:43.600 --> 03:45.340 Let's wait for five seconds. 03:45.940 --> 03:46.180 Okay? 03:46.180 --> 03:50.680 So we can leave some time for the user to see that the access is denied. 03:50.890 --> 03:54.520 And after five seconds we come back to the initial state. 03:54.730 --> 04:00.730 So we will send to Arduino three times. 04:06.110 --> 04:07.850 And what we do here? 04:07.880 --> 04:14.300 Well, we do print, text, push on, button to call. 04:14.720 --> 04:17.980 So the exact same message. 04:17.990 --> 04:25.160 And then well, actually, we don't need to play the buzzer anymore because here we play a sound when 04:25.160 --> 04:27.620 we open the door, when we close the door. 04:27.620 --> 04:30.380 So that's a physical action or when we deny access. 04:30.380 --> 04:33.980 But after that, no need to add another sound. 04:34.010 --> 04:42.730 So let's do set directly with 000 and then so red, green and blue on. 04:43.130 --> 04:51.830 And what we can do also is like we did for the open command is that when we deny access from Telegram, 04:51.830 --> 05:04.580 we can say bot dot send message chat ID is equal to dot effective chat. 05:05.990 --> 05:20.950 Dot id text denying access so that when we do the deny command here from Telegram, we also have a confirmation. 05:20.960 --> 05:25.040 Okay, here we have a confirmation opening the door so we know that's happening. 05:25.040 --> 05:30.650 And with denying access, we have a confirmation that we are denying the access. 05:30.770 --> 05:36.710 And now, well, we're going to have the same problem as with the open door handler. 05:36.710 --> 05:41.240 So basically here, if you don't put run async. 05:42.130 --> 05:43.150 All the callbacks. 05:43.150 --> 05:49.120 So all the deny access you're going to call are going to be put in a queue and are going to be executed 05:49.120 --> 05:52.150 one by one instead of in parallel. 05:52.150 --> 05:55.270 And you don't want that because you have a Time.sleep five here. 05:55.270 --> 06:00.820 So if you press four times, then you're just going to do that for five seconds and then five seconds 06:00.820 --> 06:05.350 Et-cetera So you're going to continue to run the callbacks for 20s. 06:06.370 --> 06:07.570 So we do. 06:08.690 --> 06:16.310 Run async also for the deny request. 06:16.310 --> 06:20.870 And we also going to use those two flags here. 06:20.900 --> 06:21.350 Okay. 06:21.350 --> 06:30.510 So Global Open, the request and global handling Doe. 06:31.220 --> 06:39.830 So we are first going to do if open door request and put that inside the if. 06:41.370 --> 06:41.940 Why is that? 06:41.940 --> 06:45.630 Because we don't want to deny an access if we don't have the request. 06:45.660 --> 06:45.920 Okay. 06:45.930 --> 06:50.040 Imagine that your intercom at your home is just printing access denied. 06:50.070 --> 06:53.610 By itself, without anyone to request to open the door. 06:53.640 --> 06:54.970 That's going to be a bit weird. 06:54.990 --> 07:02.460 Okay, so if we have an open door request, well, actually, from telegram, we can send either open 07:02.460 --> 07:03.650 or deny comment. 07:03.660 --> 07:15.070 So we either going to go here or to go here, and then at the end we can do open door request is false. 07:15.090 --> 07:15.630 Okay. 07:16.230 --> 07:18.330 So then we can try again. 07:18.570 --> 07:26.130 And also we are not going to deny the access if we have the handling door currently on. 07:26.130 --> 07:31.940 So basically, if we are opening the door, we're not going to deny access at the same time. 07:31.950 --> 07:32.430 Okay. 07:32.430 --> 07:36.360 So I'm going to put not handling door. 07:36.390 --> 07:38.400 This is just a question of logic here. 07:38.400 --> 07:44.020 And the same thing is that if we are currently denying the access, we are not going to open the door. 07:44.020 --> 07:49.120 We are going to wait that this action is finished to start another action. 07:49.120 --> 08:01.000 And so I'm going to put here handling door is equal to true and here handling door is equal to false. 08:01.000 --> 08:07.330 So even if we don't physically handle the door, we handle the door mechanism. 08:07.330 --> 08:07.630 Okay? 08:07.630 --> 08:10.770 We just keep it locked for five seconds. 08:10.780 --> 08:10.990 Okay? 08:10.990 --> 08:16.870 So if you send the deny command, you're going to have handling door is equal to true for the duration 08:16.870 --> 08:17.590 of. 08:18.420 --> 08:18.860 This. 08:18.870 --> 08:20.400 So basically five seconds. 08:20.400 --> 08:26.910 And then if you try to open the door while you are in this, that's not going to work because the handling 08:26.910 --> 08:28.710 door is going to be true. 08:28.740 --> 08:29.160 Okay. 08:29.160 --> 08:35.310 So with those two flags, we make sure that we only process the comment from Telegram when we have a 08:35.310 --> 08:38.220 request and that we only process one comment. 08:38.250 --> 08:46.170 Either we open the door once or we deny the access once, and then we need to wait for another open 08:46.170 --> 08:47.160 door request. 08:47.490 --> 08:47.790 Okay. 08:47.790 --> 08:56.190 And here we don't send requests if we are currently inside the request or if we are currently handling 08:56.190 --> 08:56.730 the door. 08:56.910 --> 08:57.480 All right. 08:57.480 --> 08:59.380 So now is the time to try this. 08:59.400 --> 09:00.870 Let's run that. 09:00.870 --> 09:03.420 So the Arduino is still the same. 09:04.050 --> 09:04.920 Could not connect. 09:04.920 --> 09:08.640 Yes, if I actually plug the Arduino. 09:11.180 --> 09:11.570 Okay. 09:11.570 --> 09:16.250 Starting and then main loop is starting. 09:16.250 --> 09:19.850 So let's press on the push button. 09:19.850 --> 09:21.560 We have a notification. 09:22.250 --> 09:26.230 Someone is ringing the bell and that someone is. 09:26.240 --> 09:28.280 Well, we don't see that person. 09:28.280 --> 09:33.080 So let's deny the access and let's look at what we have. 09:33.950 --> 09:34.250 Okay. 09:34.250 --> 09:37.640 We have a sound from the buzzer read Access Denied. 09:37.640 --> 09:41.720 And after five seconds we have again the initial state. 09:41.720 --> 09:43.310 So that's correctly working. 09:43.310 --> 09:49.310 Now what you can do, you can try again and you can deny the access again or you can accept and open 09:49.310 --> 09:49.910 the door. 09:50.150 --> 09:50.780 ET cetera. 09:50.780 --> 09:51.470 ET cetera. 09:51.470 --> 09:57.050 So let's correctly stop this program with control C Here you can see that it was quite faster. 09:57.080 --> 09:57.470 Okay. 09:57.490 --> 09:59.780 Depends on the updater, I guess. 10:00.110 --> 10:03.200 And, well, our python code is now finished. 10:03.200 --> 10:08.150 So this code is actually you can see 130 lines. 10:08.660 --> 10:15.660 And as a quick recap, we have so we have some inputs, then some global variables. 10:15.690 --> 10:22.110 We initialize the serial, we have a function for the serial, we initialize the camera and then we 10:22.110 --> 10:23.970 have our telegram callbacks. 10:23.970 --> 10:29.040 So three callbacks, we initialize the bot and the updater. 10:30.270 --> 10:33.990 And after everything has been initialized, we wait for three seconds. 10:34.020 --> 10:40.530 We put the initial state of the application and we start the main loop in the main loop. 10:40.560 --> 10:45.120 Well, basically we just read from Serial, and if we have received something, we check if we have 10:45.120 --> 10:51.810 a button pressed comment and if we have a button pressed comment, we try to send a request to telegram 10:51.810 --> 10:57.810 with a message, a photo, and some instructions so that the user can give open or deny. 10:57.810 --> 11:00.540 And that's going to call the telegram callback. 11:00.570 --> 11:01.050 All right. 11:01.050 --> 11:04.980 And that is the end of this step number nine of the final project.