8/31/2023 0 Comments L293d 2 dc motors arduino![]() You can refer to the diagram below to see how the H-Bridge works. When two of these switches are activated at the same time in a particular format, the direction of flow of current is changed which then changes the direction of rotation of the motor. How an H-Bridge works.Īn H-Bridge consists of four MOSFETs or Transistors wired as switches. This is achieved using an H-bridge circuit which is used for switching the polarity of a voltage applied to a load like a motor in this case. The direction of rotation of a motor is determined by the direction of flow of current through the motor. Direction of Rotation control using H-Bridge. Arduino PWM Output and LED brightness Control.I have a post with a more detailed explanation of how the PWM technique is used with Arduino which you can refer to using the link below. When the duty cycle is 100%, the pulse is constantly HIGH and the motor receives full power and spins at its rated output speed while a duty cycle of 0% means the pulse signal is constantly LOW therefore no voltage across the motor and the motor will stop rotating. The duty cycle is given in percentage and the higher the duty cycle, the higher the voltage across the motor which also increases the speed of rotation. The voltage applied to the motor determines the speed of rotation of the motor by varying the width of this square wave called a duty cycle. PWM enables us to control the voltage applied to the motor in form of square wave pulses with a certain frequency. The direction of rotation is determined by the logic on these pins. IN1, IN2, IN3 and IN4 pins are for controlling the direction of rotation of the motors. However the speed of rotation is better controlled using PWM signals. When these pins get a HIGH signal the motors will rotate and when they are LOW the motors stop moving. ![]() Each channel on the IC can deliver up to 600mA to the DC motor but the amount of current supplied to the motor depends on system’s power supply.ĮNA and ENB are the speed control pins for motor A and B respectively. This is where the DC motors having voltages between 4.5 to 36V are connected. OUT1 and OUT2 are the output terminals for motor A while OUT3 and OUT4 are output terminals for motor B. VCC2: is the power supply for the H-Bridge circuits for running the motors and is in the range 4.5V to 36V. VCC1: is the power supply for the IC circuitry and should be 5V. There are two power supply pins, VCC1 and VCC2. ![]()
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