Dual h-bridge driver ic

The universal 7. The H-Bridge Motor Shield can be controlled by simply applying logic 0 or 1 to the direction pins for that motor and a PWM signal to the speed pin.

In this way, speed and direction of two separate motors can be controlled independently. H Bridge configuration is commonly used in electrical applications where the load needs to be driven in either direction.

Sometimes it is called a "full bridge", the H-bridge is so named because it has four switching elements at the "corners" of the H and the motor forms the cross bar. The basic bridge is shown in the figure to the right. A typical H-Bridge structure is shown below: The current flows through the load M — Motor in one direction when S1 and S4 switches are closed and current flows in the other direction when S2 and S3 switches are closed. This higher current signal is used to drive the motors.

LD contains two inbuilt H-bridge driver circuits. In its common mode of operation, two DC motors can be driven simultaneously, both in forward and reverse direction. Input logic 00 or 11 will stop the corresponding motor. Logic 01 and 10 will rotate it in clockwise and anticlockwise directions, respectively. Enable pins 1 and 9 corresponding to the two motors must be high for motors to start operating.

Motors are rated at certain voltages and can be damaged if the voltage is applied to heavily or if it is dropped quickly to slow the motor down. Thus PWM. Take the water wheel analogy and think of the water hitting it in pulses but at a constant flow. The longer the pulses the faster the wheel will turn, the shorter the pulses, the slower the water wheel will turn.