 Good evening everyone, my name is Kenneth, very excited to see many unfamiliar faves first, which means our group is going. So I think the title is a bit misleading. Some people think that it's really like a hub where you can plug into your PC and you can integrate your devices. But what it really does is it's like a power hub. The whole original project may be like a USB power hub. So just in case you are wondering, all it does is to separate a power. Let me explain further. So you must be wondering why do I want to make my own USB hub, right? So I mean, there's no other reason. I mean, there's nothing that you cannot make as a maker, right? And I think another problem I was trying to solve was I needed a controllable USB port. So most of the USB hubs or ports that you plug into, you already get power. But I wanted a way to turn on and off the power for various reasons. And the hub has a dual power option as well. You can plug in a normal micro USB or you can plug in a bare jack. Then I think this is a second or a third PCB that I'm designing. So doing a project like this allows me to gain more experience. And the last one is really what resonates with me. It's way more fun to build one yourself than to buy one. And it's much easier to buy a USB hub in the market than something that you are building. So yeah. So this is how the USB power hub looks like. So you have the DC bare jack, you have the micro USB input, and you get four ports. So on each port you have a switch controlling IC. So you can control the power on and off. And it tells you when there's a fault as well. So let's say there's a short circuit. You can actually tap one of the pins to your Arduino and you can monitor the port itself. So you know that there's something wrong with your circuitry. And it also has protection. So if there's a short, there will be no power supply. So it's ready. I know it works and I know it's safe. Some of the cheap ones that you buy, you will be surprised what DJI has inside. They basically have nothing. So I also designed a 3D printer casing. So what I did over here is somewhere in March 2015 I designed the first version. Then I always wanted to do more with the USB hub. But one problem that I faced is I couldn't charge the Apple product. Because they did some stuff on the data line so I couldn't do the charging. So I went to read up from Adafruit and Adafruit sells this really popular product called Minty Boost. Because I've seen a place in the King can. So Lady Yedda came up with the solution where all you have to do is to put like a 75K and a 50K resistor across the data line. And you will be able to get around 2 volts on each of the lines. That would enable you to do the charging. So it sounds pretty simple. So what I did was to go back to the lab. Solder up some resistors that I could find. I think I have a 75K and a 51. That's the closer I can get. And it's really fun when you have your own design. So it looks something like this. When it's idling, you literally use very minimum power. Just to show that it really works. This is an iPhone 4. And we are drawing around 500 million. So that's what you are allowed to draw when you have 2 volts on the data line. So another picture over here to show that it's working. So you can see that it's charging over here. So that's all for the sharing. Let me show you the actual thing and I'll pass them around. So I have a Xiaomi power bank here. I have a voltage and power indicator. Then this is the USB hub and the iPhone 4. So if you look at the set over here, the resistors are here on the second port. So I'll just power on the USB hub. Then I'll plug it in. Let's see whether it works or not. Oh, it's not peaceful. The power bank died. Hold on one second. I've got a power bank here. Oh, there's light. It's always the problem. It's a bit too fat. I want to do the same thing. Okay, so the power hub is power on now. Let me just plug into the second port. I'll pass it around. Just don't charge your own device. And you just keep the iPhone 4 there. That's all for my lightning talk. If you guys have never tried a lightning talk, I recommend you to have one. And give it a try and share your project with us.