 When a human out of ten doesn't have access to electricity, not even to turn on a lamp at night. The energy of the sun, rivers or wind can be transformed into electricity, but it's not always accessible to everyone. In Mexico, we met Felix. He teaches how to build wind turbines in remote communities. At Lotec Lab, we travel the world to find the best Lotec. Inventions that are useful, sustainable and accessible to all. You can generate electricity from anywhere, from the strength that the wind gives us. We make the rotor work, and the rotor generates electricity so that we can directly channel it to motors or we can use batteries for lighting at night or cell phones or a computer. I like it because it's not free. It's silent, clean, reliable. You can do it at home. It's not one that comes from China. It breaks and you have to charge the piece from China like the one that the controller shows you. That's right, there's a lot of material for the recovery. You can get the metal plate from the drawers and you can use it from a Molino, from Nix Tamal, and then the discs can be from car brakes discs. Why is this technology interesting here? For example, here, where we are, electricity is about two kilometers away and it's very expensive to bring it here. I've seen that there are people who have a lot of wind in the way they live and they're consuming CO2 energy and CO2 has to burn gas and nuclear to generate electricity. We go to the remote communities and we invite people to participate. To participate in a better world can be more sustainable. They catch the rainwater that uses solar energy, that uses wind energy that is always in its natural waters that don't have chemicals, that don't have poison, that have their chickens. That's our purpose. Felix's system is called a Pigot wind turbine. I will show you how to build another one, very simple and cheap, using a recycled printer motor. We discovered it in Senegal. It can charge a phone or a LED lamp. A wind turbine is used to convert the mechanical energy of the wind into electricity. The wind pushes the blades that turn the rotor of the engine. It produces alternating current and we turn it into direct current thanks to these electronic components. You will need a stepper motor, a wooden board, a piece of metal, a PVC pipe, screws, electric wires, a capacitor, two bridge rectifiers, shrink tubes, connectors, and a bicycle tube. Make sure that the motor shaft can rotate and that you have the connections. Cut the wires coming out of the stepper motor. You'll have to test all the pairs of wires and find out the two pairs that deliver the highest output voltage. Using a drilling machine and a voltmeter set to alternative current, write down the output voltage for each of the pairs. Select the two pairs with the highest output voltage. They will be connected to the electrical circuit of the wind turbine. Cut a metal plate and drill five holes. Solder the middle hole to the motor shaft. Draw and cut out the blades from a PVC pipe. Send the edges of each blade. The leaving edge should be rounded and the trailing edge sharpened. Drill the blades. In a wooden board, draw and cut out the tail. Cut a square that will be the base to hold the four blades. Make a triangle if you choose to put three blades. In the tail, cut out a space that matches exactly the size of your motor in order to hold it. Screw the blades to the base. Screw this base to the metal plate. Check that the blades are well balanced. To charge the battery or lighter lamp, it is necessary to have direct current. To transform AC into DC, you will need two bridge rectifiers. The energy supplied by the wind turbine is not stable. In this region, you need to connect a capacitor that will store and release the energy to stabilize the output energy. Connect each pair of wires from the stepper motor to the AC inputs of each rectifier. Connect the negative outputs of the two rectifiers together. Then connect the positive outputs of the two rectifiers together. Connect to those two points, the positive and negative legs of the capacitor and the positive and negative output wires. Cover the engine and the electrical circuits with the bicycle tube to protect them. If you want to use it to charge a phone, you have to connect the output to a USB DC-DC converter. If there is a good wind, it will charge as usual. I love this small wind turbine and it's so simple, eco-friendly and accessible to everyone. If you also make it, please share it with us. Our goal at the Lotte Club is to find Lotte innovation, document and promote them so that anyone can replicate them. It's open source and collaborative, so feel free to comment.