![]() ![]() Since the transistor can be a switch, you’ll be able to make the motor spin in either direction by turning on and off the four transistors in the circuit above. From there you’ll learn that the transistor can work as a switch that you can open and close with the voltage on the base. If you’re not sure how the transistor works, I recommend you read the article How Transistors Work first. You can build an H-bridge with four transistors. And the motor spins in the opposite direction. If you instead close switch 2 and 3, you have plus connected to the right side and minus to the left side. And the motor will start spinning in one direction. If you close switch 1 and 4, you have plus connected to the left side of the motor and minus to the other side. When you can control two motors to go either forward or backward – you can build yourself a robot!Ī DC motor spins either backward or forward, depending on how you connect the plus and the minus. You normally use it with a microcontroller, such as an Arduino, to control motors. An H-bridge is a simple circuit that lets you control a DC motor to go backward or forward. ![]()
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