 I was there earlier for a software topic, so I'll speak about some hardware projects for a club in internship. So I'll talk about two projects quickly. The first one is called as an open sky planetarium. How many of you have been to a planetarium in your childhood or in the recent years? So you have seen those shows, they show, as in they have a half an hour or 45 minute show where they just browse through the entire galaxy, you know, some stuff, they teach you something, they tell you stories about it. So this is a very novel project where we are trying to give this planetarium experience at a much cheaper rate. So how much do you think will be the cost for an institution or a school to set up a planetarium in their campus? It will be too costly, right, because they have, you need a dome structure, you need those projections, projection cameras, you know, stuff like that. So it's quite costly. So we have this innovation in which we are trying to rule out wherever you need this requirement of creating a dome or needing lasers, you know, projections, etc. So we are removing all of that and what I've come up with is called as an open sky planetarium. So the idea is, so which is the freely available dome here, they all have a freely available dome, the name, sky, right, the sky is visible to all of us, of course the sky should be clear to see all the stars and, you know, all heavenly bodies. So the idea is, we are basically targeting schools first so that this product will be first launched in school and the idea is basically to use this sky as a dome, the night sky, the night clear sky as a dome and have a laser pointing device which points to the particular star so that the person is looking at it, you know, is guided to that particular star. There are like millions of stars, right, if they on a very clear night, you would see like a, you know, millions of stars, if someone asks you, go look at that pole star. I mean, if you have not seen a pole star before, you will be like, okay, where it is, I just see, you know, hundreds of stars, where exactly are you talking about. So this laser point is going to point to that particular star exactly and it will be like a guide. So if you, if anyone would have joined a planetarium club earlier, this is actually done by a person, okay, a person is actually holding a laser pointer in his hand and he basically knows everything about astronomy, he knows everything about what is going on to sky and he is a person who would point it to the sky and speaks about it, hey, look at this, this is Saturn, I mean, on, look at this, this is this constellation, okay. So a person is here being replaced by a hardware, okay, a pointing device is replacing a person, fine. But now, we need this, the last point, the resolution of that device, you know, the pointing device has to be very, very accurate, less than 0.20 degrees is something that is minimum that we need, okay. Now for the hardware guys who are going to sign up for this project would need to do all this, okay. The very first is the panel tilt mechanism, okay, panel tilt, you understand what is panel tilt mechanism, you know, x axis rotation and a y axis rotation, okay. So we need a panel tilt mechanism. Of course, we need laser, a good quality, you know, moderately powered laser. Then we have motor drivers, of course, depending on what motors do you choose, we would need specific motor drivers. Then position sensors, if you, if at all, if at all you want to make it closed, okay, if at all you want to see whether the laser is pointing in the red direction. Then of course, so I am talking about night skies in an open field, right, from where would you get power? You can't even fit solar panels, it's a night sky, there is no sun, okay, so you can't even use solar panels for powering. So you need battery, okay, you need a proper battery backup for, you know, think about it. So panel tilt mechanism, so this is basically governed by the motor that you want to be using. So step angle is very important. So when I say that, when I point at a particular star x, okay, I am pointing at it. When a point to a particular star y, which is, you know, just besides x, so there the results would matter, okay, if you, if by default, so for example, you know the moon, right, the moon, you know how big the moon is, how big the moon looks in the sky, right. The diameter that you look, you know, at the sky of a moon is basically half a degree. Means if you just move half a degree, if the laser pointer moves half a degree, you will cover the entire moon. That's what happens. That's why we need so much of resolution, right, because the distance is in miles, right, thousands of kilometers. So as far as you go, the minor, you know, variations will matter. So that's where it comes. Then of course the weight and holding torque, because you want to hold that position long enough, you know, for the briefing to finish. This is how a typical phantom mechanism looks like. You can't recognize it right now, but there are like two motors. One moves like this. The other one moves like this. Okay. So that's how it's set up. It is available in the market. Laser, of course, what I just consider, color is a consider, so color is basically you need green lasers. You can't put red lasers, because red laser is not that visible in the night sky. It's actually pitch dark, right, and then you flash a red laser and you flash a green laser. The green laser would be more visible to us, you know, naked eye. Size of course shouldn't be, you know, huge motor driver again. So if you know about stepper motor, how many of you know about stepper motor? Okay. So you must be knowing about this micro-stepping, right? Micro-stepping basically is a feature which can be applied to stepper motors. This is basically provided by the driver that drives the stepper motor and the driver should be capable of micro-stepping the motor. Micro-stepping means what? Most standard motors have like around 1.8 degrees of step angle by default. Manufacturer, you know, builds it that way. Now the driver can actually pulse it accordingly and bring down that 1.8 degree to, you know, 1.5, 1.4, you know, 1.16, 1.32. That is called as micro-stepping. You'll learn all that in the project. Okay. Position sensors, if you need it to be closed loop, of course, again the sensors, resolution also should be less than 0.20 degrees. From factor again, it should be small enough to be mounted on the device. Battery backup of fire was at least because we need to run a show, right? You should run at least two shows in a line. So fire or backup is needed. What is this project which I already talked about earlier, you know, in the software section, which is improving, which is remote control virtual labs. So I'll just skip the initial slides. You have already been through it. So the hardware part, I'll come to hardware part. So you have, remember, I'm talking about 30 devices, okay, on a single computer. And all these are USB devices. So how would you connect USB multiplexing, right? But then the solution is not robust. We have tried all this, okay? Solution is not robust. It tends to fail, maybe, you know, not industrial grade or a lot of dust or something like that. Or the current distribution is not good or power fluctuation, whatever. So we want an elegant solution for this particular work. Then I talked about master's wave architecture, if you remember. So right now, the current architecture is like this, okay? Just one computer. This is a server computer. Just one computer and then there are devices connected to it, okay? Now I want this computer to be splitted. I want these devices to be on a secondary slave server, you understand? So I have a central main server, which talks to a bunch of slaves to which the devices are connected, okay? So the devices are basically experimental setups, which the students are accessing online. So now they go via the master server, right? This can be implemented using Raspberry Pis, according to me. You don't need a full-blown desktop kind of thing to work, because this is all online 24-7. You don't need the monitor. Why do you need the monitor, right, for a server quickly? So Raspberry Pis should be possible to deploy this. So you have to explore this idea of using Raspberry Pis to set up a master slave protocol. And secondly, it has to be over-ethernet, because these slaves, they could be topologically anywhere, right? They might be in a different building, they might be in a different city, possible. These are all just ideas that I'm thinking about. So they all talk over the ethernet, okay? But if it is local, if it is local to this particular premises, it should be, you know, on the local network, rather than living on the web. Okay? Thanks.