WEBVTT 00:00.050 --> 00:05.780 Working with the Raspberry Pi Gpio can be quite dangerous for your board if you don't follow exactly 00:05.780 --> 00:09.290 the instructions and if you plug a wire in the wrong place. 00:09.320 --> 00:12.560 Note that you don't risk anything for yourself, okay? 00:12.590 --> 00:16.400 The current is way too low to get hurt or to hurt anyone. 00:16.430 --> 00:22.280 The risk here is to kind of fry your board, and after you fry your Raspberry Pi, you won't be able 00:22.280 --> 00:23.450 to use it anymore. 00:23.480 --> 00:27.500 So here are a few important points that you have to follow. 00:27.500 --> 00:31.460 If you carefully follow them, you won't have any problem. 00:31.490 --> 00:38.510 First of all, always power off your Raspberry Pi first when you make a change in the circuit. 00:38.540 --> 00:44.210 Even if it's just to disconnect and reconnect one single cable, can you power off your Raspberry Pi? 00:44.240 --> 00:49.070 You remove the power cable, you make the hardware changes, and then and only then you can power the 00:49.070 --> 00:50.060 Pi again. 00:50.090 --> 00:54.650 Second point is when the Raspberry Pi is powered on with some hardware components. 00:54.650 --> 00:58.700 Don't touch the components with your fingers or try not to do it too much. 00:58.700 --> 01:03.740 You may damage your pi with an electrostatic discharge, also called ESD. 01:03.860 --> 01:09.730 And also this is quite obvious, but don't use any metallic tool to touch the hardware setup when it's 01:09.730 --> 01:12.220 running, for example with a screwdriver. 01:12.250 --> 01:15.430 Okay, only bad things can happen if you do that. 01:15.460 --> 01:21.490 Third point here is that before you power on your Raspberry Pi, double check and even triple check 01:21.520 --> 01:24.550 your hardware setup, even if you are sure about it. 01:24.550 --> 01:30.580 Personally, even if I make the simplest hardware setup and then I'm sure about, I still double check 01:30.580 --> 01:31.840 everything that I do. 01:31.870 --> 01:37.810 Fourth point is when you build a circuit, always start with the ground pins and then make sure that 01:37.810 --> 01:40.600 the ground is common for all your components. 01:40.600 --> 01:43.570 And I'm going to come back to this when we build the circuit. 01:43.570 --> 01:48.670 And finally the Gpio is only support 3.3V. 01:48.670 --> 01:52.300 So don't connect anything that uses five volts directly. 01:52.330 --> 01:52.540 Okay. 01:52.570 --> 01:58.570 You might burn the Gpio pin, not necessarily burn the Raspberry Pi, but you might burn the pin. 01:58.570 --> 02:01.300 And then you can't use that specific pin anymore. 02:01.330 --> 02:07.570 So to recap here, just plugging a wrong cable in the wrong pin can destroy your Pi in a fraction of 02:07.570 --> 02:09.830 seconds, and then you have to buy a new one. 02:09.860 --> 02:12.740 It happened to me in the past and it's not really fun. 02:12.770 --> 02:14.870 Of course, I'm not saying that to scare you. 02:14.870 --> 02:20.300 I just want to make you extra careful with any hardware setup you will do if you follow what I do. 02:20.300 --> 02:25.730 And if you always double check any setup before you boot the Raspberry Pi, then everything will be 02:25.730 --> 02:26.180 okay. 02:26.180 --> 02:31.940 And until you really know what you're doing, I suggest you don't try to improvise with hardware setup. 02:31.940 --> 02:37.280 I will make some explanation videos when I give you instructions to make a new hardware setup, or to 02:37.310 --> 02:41.720 improve the circuit, and I will give you schematics for the activities. 02:41.720 --> 02:48.740 So first watch the videos and then you go step by step from beginning to end by pressing on pause anytime 02:48.740 --> 02:51.140 you need between each instruction. 02:51.140 --> 02:53.300 And look at the image that I provide. 02:53.300 --> 02:57.980 And you will notice that I will often give some extra warnings when dealing with hardware. 02:57.980 --> 03:02.930 And this may seem a bit repetitive, but well, better safe than sorry. 03:02.930 --> 03:08.000 And at the end of the course you will have enough understanding so you can experiment by yourself with 03:08.000 --> 03:09.470 different kinds of setups. 03:09.470 --> 03:14.330 And now that I have said all that, let's start to understand how the breadboard works.