5/22/2023 0 Comments L293d motor driver circuit pdfThis combination of transistors is know an h bridge driver. For altering the motor direction we need a combination of transistors. Through a single transistor its not possible to alter the direction of motor rotation. But the problem lies in direction control of motor. Through transistor we can also control the speed of motor. Transistors base takes 3.3 volts TTL microcontroller output signal and can drive heavy loads across its collector and emitter side. Transistor is a best choice to control heavy load with microcontrollers. We need an extra power and external circuit which can handle motor heavy power load. We can not power the dc motor directly through the nodemcu output pins. Nodemcu esp8266 WiFi module works on 3.3 volts TTL logic. Dc motors power consumption is 12 volts at 300 mA of current.
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