![]() One can get it to turn the motor in the opposite direction by simply changing the terminals. This flow of the current would make the motor turn in one direction. This creates a path for the current to flow, starting from the V input to switch S1 to the motor, then to switch S4 and then the exiting from the circuit. Now if the switches S1 & S4 are kept in a closed position while the switches S2 & S3 are kept in an open position meaning that the circuit gets shorted across the switches S1 & S4. In above diagram, the arrow on the left points to the higher potential side of the input voltage of the circuit. H-bridge is a circuit which allows the voltage to be flown in either direction. H-bridge is the well-known process to control a low current rated motor. There are 2 INPUT pins, 2 OUTPUT pins and 1 ENABLE pin for each motor. The L293D is a 16 pin IC, with eight pins on both sides. After parallel connection, it will handle 1.2A continuously and 2.4A for certain time. L293D ICs are rated at about 600 mA and 1.2 A for a certain time. ![]() In general, two ICs put in parallel so voltage remains the same but current doubles. 7) Connect the Arduino using Arduino USB cable and upload the program to the Arduino using Arduino IDE software. 6) Connect SENS A pin of IC to the ground. 5) Connect EN1 of IC to pin 2 of Arduino. 4) Connect IN2 of the IC to pin 9 of Arduino. 3) Connect IN1 of the IC to pin 8 of Arduino. There is some shield found on the market for these. 2) Connect the motor to pins 2 and 3 of the IC. It is an easy way to double the current capacity by using two ICs connected in parallel. The L293D switches it output signal according to the input received from the controller. There are two voltage pins in the IC where one is used to draw current for the working of the motor driver and another one is used to apply voltage to the motors. It receives signals from the controller and transmits to the motor to motors. And there needs a motor driver to control high and low voltages of those motors. So, it needs external power supply to control the motors. Again, current is not supplied from the controllers. Microprocessors or microcontrollers require a small amount of current and operate at low voltage, whereas motor needs higher current and voltage. Microprocessors or microcontrollers help to control those motors. In automation system, DC motors are frequently used in robotics to control movement. These driver helps to control two DC motors. ![]() There are many motor driver ICs, L293D, L298N are most popular. Motor driver inputs as low current signal and gives higher current. A motor driver helps to control the speed of the motor with a small current which is amplified to a higher current signal.
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