WEBVTT 00:00.050 --> 00:03.260 This is step number seven of the final project. 00:03.260 --> 00:10.220 And in this step, we are going to send a message along with the photo we've just taken on the Telegram 00:10.250 --> 00:18.590 app whenever someone has requested to open the door so we already have the code to receive the button 00:18.590 --> 00:20.690 pressed message from the Arduino. 00:20.720 --> 00:24.940 We know this is an open door request and so we take a photo. 00:24.950 --> 00:30.650 Now let's initialize the telegram bot to send that photo and a message. 00:30.830 --> 00:34.430 And so I'm not going to set up the bot here, okay? 00:34.730 --> 00:38.780 If you haven't set up a bot and if you haven't created the group. 00:38.780 --> 00:45.080 So I'm going to also use the Telegram app from the Raspberry Pi or from your phone. 00:45.080 --> 00:45.320 Okay. 00:45.320 --> 00:46.430 It doesn't matter. 00:47.150 --> 00:53.150 So if you don't have a bot, if you don't have already a token saved on the Raspberry Pi, and if you 00:53.150 --> 00:58.730 don't have a group chat with the bot, then please come back to the lesson on how to set everything 00:58.730 --> 00:59.300 up. 00:59.450 --> 00:59.750 Okay. 00:59.750 --> 01:05.610 And now I'm going to here import telegram in the code. 01:05.610 --> 01:15.630 So I'm going to import the bot from telegram import bot and where are we going to initialize the bot 01:15.660 --> 01:21.210 where we initialize serial, we initialize the camera and then we wait. 01:21.210 --> 01:23.610 Let's just initialize the bot here. 01:23.610 --> 01:29.460 So init telegram bot and we can do print. 01:31.080 --> 01:31.350 It. 01:32.310 --> 01:34.230 Telegram bot. 01:36.010 --> 01:40.210 We've bought is equal to but token. 01:40.210 --> 01:46.540 So we need to give a token and to get the token we are going to get it from where we have saved it before. 01:46.540 --> 02:03.940 So we've open slash home slash by slash dot local slash share slash dot telegram bot token. 02:03.940 --> 02:09.760 So if again you don't understand this, please go back to the lesson on how to create a token and how 02:09.760 --> 02:14.980 to save it on the Raspberry Pi with a for reading. 02:15.160 --> 02:26.460 So as if and we do telegram token is equal to f dot read dot strip. 02:27.520 --> 02:27.660 Okay. 02:27.730 --> 02:35.030 So we don't have any special character at the end and we do then bot is equal to bot with token is equal 02:35.030 --> 02:38.240 to telegram token. 02:39.730 --> 02:40.420 All right. 02:40.900 --> 02:42.850 I'm not going to do the updater now. 02:42.850 --> 02:45.010 We're going to do that in the next step. 02:45.010 --> 02:52.420 And also what I'm going to do before I save is to create a new file for the step. 02:52.600 --> 02:53.470 Okay? 02:53.470 --> 02:55.750 So don't save that one. 02:56.830 --> 02:57.480 Do you want to save? 02:57.490 --> 03:00.220 No, but I'm going to save this as. 03:01.640 --> 03:02.570 Intercom. 03:03.500 --> 03:05.750 Step seven. 03:07.480 --> 03:08.170 All right. 03:08.560 --> 03:10.750 And let's continue where we were. 03:10.780 --> 03:16.300 So here we create our boat so we can send message from the boat. 03:16.300 --> 03:23.590 And to send message, we also need the chat ID What is the chat ID of our group here? 03:23.710 --> 03:35.260 Well, I'm going to come back to one of the previous Python file where we do send notification and we 03:35.260 --> 03:37.570 have the chat ID, so that is the chat ID. 03:38.600 --> 03:39.590 That I got. 03:41.080 --> 03:42.970 Okay from this group. 03:43.450 --> 03:49.480 And again, if you don't know how to get that, go back to the lessons and the telegram bot. 03:49.690 --> 03:51.880 And so chat ID is that one. 03:52.390 --> 04:01.270 Okay, now we can send messages from this bot to the chat group here and let's do that actually. 04:02.020 --> 04:09.190 So when we have opened or request taking a photo and I'm going to add another log and sending it to 04:09.790 --> 04:10.720 Telegram. 04:12.010 --> 04:21.370 So we do camera dot capture and then we're going to send a message, but not send message. 04:22.060 --> 04:24.790 Chat ID is equal to chat. 04:24.910 --> 04:36.280 ID and text is equal to let's say someone is ringing the bell. 04:38.590 --> 04:41.150 We are also going to send the photo. 04:41.150 --> 04:44.030 So to send the photo we need to open it because we capture it. 04:44.030 --> 04:50.900 But then we need to open the file with open so we have the image file name already. 04:52.640 --> 05:07.010 We are going to use our permission as photo and we do bot dot send photo with chat id is equal to chat 05:07.040 --> 05:15.350 id the one we have and photo is equal to the photo we have here and we're going to receive. 05:15.350 --> 05:18.620 Someone is ringing the bell plus the photo. 05:18.650 --> 05:26.030 What we can also send is well, some instructions on what to answer to that. 05:26.030 --> 05:26.510 Okay. 05:26.510 --> 05:31.670 Because if you just say someone is ringing the bell, well, thank you for the information, but what 05:31.670 --> 05:32.750 do I do next? 05:32.780 --> 05:39.380 What you can send is the command to reply if you want to open or deny access. 05:39.380 --> 05:44.920 So bot dot send message chat id is equal to chat. 05:45.610 --> 05:48.850 ID text is equal to. 05:49.330 --> 05:51.190 And then let's go back to. 05:52.570 --> 05:54.490 The protocol we have. 05:57.540 --> 06:03.390 And you can see what we want is that the user on Telegram sends open or deny. 06:04.790 --> 06:13.530 So why not just saying to the user, send slash open or slash deny? 06:13.550 --> 06:19.280 And by doing this, it's actually great because well, on the application you can just click, you will 06:19.280 --> 06:23.630 be able to click on that, you will see and that's automatically going to send the comment. 06:23.660 --> 06:28.520 Okay, so we're going to see how to open or deny just in the following steps. 06:28.520 --> 06:30.440 Now let's run that code. 06:30.440 --> 06:33.440 So the code is still running on the Arduino. 06:34.040 --> 06:35.590 Let's run it here. 06:35.600 --> 06:36.890 Let's run the python. 06:36.890 --> 06:38.870 Waiting for three seconds. 06:39.290 --> 06:39.610 Okay. 06:39.620 --> 06:41.600 Main loop is starting. 06:41.600 --> 06:42.950 I'm going to open. 06:43.950 --> 06:44.820 This. 06:44.850 --> 06:49.260 Okay, so let's press on the push button. 06:49.920 --> 06:54.930 You can see open door request taking a photo and sending it to telegram. 06:54.930 --> 06:58.940 And a few seconds after we have, someone is ringing the bell. 06:58.950 --> 07:05.010 So this first message and then the photo and then send open or deny. 07:05.310 --> 07:08.010 And you can see that's what I was talking about. 07:08.040 --> 07:14.520 You can directly click so you can click from your phone or from the desktop, for example, open or 07:14.520 --> 07:14.910 deny. 07:14.910 --> 07:18.120 So here it doesn't do anything because we don't have the handler. 07:18.150 --> 07:20.430 Of course, that's what we're going to do next. 07:20.610 --> 07:24.630 And before we continue, I'm going to improve the code a little bit. 07:24.660 --> 07:25.560 Why is that? 07:25.560 --> 07:29.430 Because here, for example, if I press on the button, let's say three more times. 07:31.640 --> 07:35.360 You can see we have a lot of open door requests. 07:35.480 --> 07:36.890 So actually priced more than. 07:38.410 --> 07:44.260 Three times and you can see where we receive many upon our request. 07:44.260 --> 07:48.070 And that's kind of going to flood our conversation. 07:48.520 --> 07:48.760 Okay. 07:48.850 --> 07:54.640 That's going to completely spam the conversation and we're going to receive so many notifications. 07:54.640 --> 08:00.640 So if someone is spamming on the button, well, you're going to receive hundreds and hundreds of messages. 08:00.640 --> 08:08.380 So what I'm going to do is I'm going to do first I'm going to say that we are only going to take a photo 08:08.380 --> 08:10.690 and send it to Telegram. 08:10.780 --> 08:15.790 If five seconds have passed between now and the last time we did this. 08:15.820 --> 08:16.390 Okay. 08:16.390 --> 08:21.520 So basically, I'm going to add another delay on the button pressed command of five seconds. 08:21.520 --> 08:24.460 So we only process the command every five seconds. 08:24.640 --> 08:30.280 So if you spam on the button, we're still going to receive many button press command, but we're only 08:30.280 --> 08:31.810 going to execute it. 08:31.840 --> 08:35.590 We're only going to go in the if every five seconds max. 08:35.830 --> 08:40.720 And so I'm going to add a new global variable here at the beginning. 08:41.380 --> 08:54.310 For example, here to say last time button pressed is equal to let's initialize it to time dot time. 08:54.310 --> 09:05.320 So the current time and let's say button pressed delay is equal to five seconds. 09:05.350 --> 09:07.720 So let's put seconds here so we know it's seconds. 09:08.980 --> 09:09.520 Okay. 09:09.520 --> 09:16.480 So then if you want to modify the delay, you just modify this variable here and then well, it's quite 09:16.480 --> 09:19.960 simple actually in this. 09:19.960 --> 09:24.700 So we'll actually, when we receive the message, button pressed is correct. 09:25.030 --> 09:35.680 And if it's correct, we do another if if time dot So let's actually create time now is equal to time 09:35.680 --> 09:37.090 dot time. 09:37.300 --> 09:45.650 So if time now minus let's go back here, make sure we have the same last time button pressed. 09:48.300 --> 09:55.080 Here he is greater or equal than the button pressed delay. 09:55.500 --> 09:58.620 In that case, we're going to do this. 09:58.620 --> 10:02.550 I'm going to put this inside the if. 10:03.150 --> 10:09.840 And we are also going to update the last time button pressed with time dot now. 10:10.080 --> 10:15.600 So now let's run that again and just look at the logs here. 10:16.980 --> 10:17.280 Okay. 10:17.310 --> 10:24.570 Main loop is starting and I'm going to press on the push button and I'm going to continue to press on 10:24.570 --> 10:25.110 the push button. 10:25.110 --> 10:28.800 But you see, we only have one open door request. 10:29.160 --> 10:31.410 And if I continue, well, another one. 10:31.410 --> 10:34.170 But that is five seconds after. 10:34.650 --> 10:34.920 Okay. 10:34.920 --> 10:38.010 And so we have received here not so many. 10:38.010 --> 10:43.080 We have received two new notifications, but not 20. 10:43.080 --> 10:48.580 And well, when looking at this, we can still improve because when the user has pressed on the push 10:48.580 --> 10:52.290 button and you have the text, please wait for a few seconds. 10:52.300 --> 10:57.880 What we can decide is to not send any other notification to Telegram. 10:58.000 --> 10:59.440 Okay, just one. 10:59.440 --> 11:04.270 When we press on the push button and then it's going to wait for the answer from telegram. 11:04.630 --> 11:04.840 Okay? 11:04.840 --> 11:10.030 Because in our situation now, someone can still spam on the push button and you're going to receive 11:10.030 --> 11:12.280 a new notification every five seconds. 11:12.280 --> 11:15.250 So I'm going to add here a new. 11:16.110 --> 11:19.480 Flags or boolean that I'm going to name. 11:19.500 --> 11:26.100 Open door request is equal to false at the beginning, of course. 11:26.100 --> 11:37.470 And so when we receive the open door request, what we do actually is to say open door request is equal 11:37.470 --> 11:39.160 to true. 11:39.180 --> 11:40.680 So now the flag is true. 11:40.680 --> 11:43.440 And what we're going to do is we're going to add something in this. 11:43.470 --> 11:52.500 If I'm going to put if and and another condition here, for example, let's put parentheses so it's 11:52.500 --> 11:59.670 a bit clearer, not open door request. 12:00.420 --> 12:05.190 So when you press on the push button and you have the screen, please wait for a few seconds. 12:05.220 --> 12:11.970 If you press again on the push button one second after or 10s or 20s after, it's not going to take 12:11.970 --> 12:12.590 a new photo. 12:12.600 --> 12:14.250 It's not going to send anything. 12:14.250 --> 12:16.380 And so here we are blocking the code. 12:16.380 --> 12:24.930 But what we're going to do next is that when the here when we send open or deny from Telegram, we are 12:24.930 --> 12:26.940 going to release this. 12:26.940 --> 12:30.000 So we are going to put the flag open door request to false. 12:30.000 --> 12:34.800 And so we give another chance for the user to do an open door request. 12:35.130 --> 12:35.550 Okay. 12:35.550 --> 12:41.970 So with this mechanism, we are sure that we are going to receive just one notification for one user. 12:41.970 --> 12:47.610 And so later on, if we just, for example, accept or deny very fast, we are not going to receive 12:47.610 --> 12:50.220 more than one notification every five seconds. 12:50.220 --> 12:53.880 So this way we protect a little bit our telegram chat. 12:53.880 --> 12:54.060 Okay. 12:54.060 --> 12:57.120 Because you don't want to flood your chat. 12:57.150 --> 12:58.920 Let's run this. 13:00.520 --> 13:04.380 And okay, we have an error here. 13:04.390 --> 13:06.250 Invalid syntax. 13:08.570 --> 13:12.620 Well, it's maybe better if I put a backslash here for multi-line. 13:12.620 --> 13:13.160 If. 13:14.970 --> 13:16.740 And waiting for three seconds. 13:17.960 --> 13:18.250 Okay. 13:18.260 --> 13:19.280 Main loop is starting. 13:19.400 --> 13:20.360 Press on the push button. 13:20.360 --> 13:23.120 Let's look at the log open door request. 13:23.420 --> 13:23.780 Okay. 13:23.780 --> 13:25.940 We have notification. 13:27.260 --> 13:27.860 Okay. 13:27.860 --> 13:29.510 And then press again. 13:30.660 --> 13:31.390 I press again. 13:31.400 --> 13:32.450 Nothing is happening. 13:32.450 --> 13:35.600 I press again and no more than five seconds have passed. 13:35.600 --> 13:41.360 But still nothing is happening because now we are waiting for the response from Telegram. 13:41.360 --> 13:43.240 And that's what we are going to do now. 13:43.250 --> 13:46.940 So Ctrl C and that's the end of the step number seven.