![]() ![]() If you actually did your installation job well then you are good to go. Well, ok that is possible with the right brand and proper installation techniques. After that, it should fade into the background of your life or business and offer you many years of worry-free service and dependable performance. If the door is opening while it needs to close and other way around switch the wires on pin 8 and 9.Once installed, you might think that you will never have to think about your Gate or Gate Opener again for many years to come. If you have wired everything up place one ultrasonic sensor on one side of the door and the other on the other side. Follow the schematic in the pictures and connect all the other thing to. Now we have the H-bridge we need to connect it to the Arduino. If you still don't understand the H-bridge check out this video below. If you are making a mosfet H-bridge connect the Gate pins together like in the relay H bridge. Connect the coil pins from the relay (following the 2nd picture above) A1 and B2 together and B1 and A2 together. ![]() If you are using mosfets i recommend using the IRFZ44n because they are logic level operated.Īfter the H bridge is completed we need to connect a couple of wires. Just build it like the schematic above and make sure to use thick wires and high amperage components. I have build a H bridge using 5v relays but you can also use 4 N-channel mosfets. For this we use a H-bridge configuration like in the pictures above. To control the movement of the DC motor we have to build a motor controller. If you find that the motor has not enough power to open the door or the door does not open completely try changing the location of the motor or change the length of the mechanism pieces. I have mounted the motor about 10 cm to the right of the center of the door and I have mounted the long piece of the mechanism a couple cm to the right of the center of the door post. After that I used a lot of hot glue to mount in complexity. Then I got some zip ties and zip tied the motor to these screws. ![]() I have done this by first screwing in some screw above where the motor needs to go. This maybe sounds a bit unclear but if you watch the video it will all be clear.Īfter you have made the mechanism you need to mount it on your door. Because I am using metal parts I welded it on the motor. The other side of the smaller piece needs to be mounted on the electric motor. One is where the two pieces connect to each other and the other is where the longer piece connects to the door post. It is important that there are two points which can move. It can probably also be made from wood but I am not sure how strong that is. ![]() To get the door to open we need to build a mechanism. Check the picture above to see the wires and how to short it. Without it the power supply wont start up. To get power from it we first have to short the green wire with a black wire. It will give 12 A on its 12 V rail which is plenty for our DC motor. I am using a 300 watt power supply but something lower/higher than that could also work. That is where the Computer power supply comes in. This is why it is so strong but now it needs a strong power supply to power it. The 12 V DC motor I am using can use up to 12 A of power. You can also use another DC motor you have lying around, but just make sure it has enough torque to move the door. Any windshield wiper motor wiper motor from any car will do. This is why I am using a windshield wiper motor. It is very important that the electric motor has a lot of torque and a low speed. ![]()
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