#L293d motor driver circuit board series#

When the motor is applied positive voltage on both sides then the voltage from both the sides brings the motor shaft to a halt When S1 and S3 are closed and S2 and S4 are open then the РІР‚ВSTALLРІР‚в„ў condition will occur(The motor will break). Now, when S3 and S2 are closed then and S1 and S4 are kept open then the current flows from the other direction and the motor will now definitely rotates in counter-clockwise direction The direction of motion of the motor can be clockwise or anti-clockwise, this is because the rotation of the motor depends upon the connection of the terminals of the motor with the switches.Р”Р‡or simplicity, lets assume that in this condition the motor rotates in a clockwise direction. 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 a open position meaning that the circuit gets shorted across the switches S1 & S4. In the given diagram, the arrow on the left points to the higher potential side of the input voltage of the circuit.

The basic diagram of H-bridge is given below : H-bridge is given this name because it can be modelled as four switches on the corners of РІР‚ВHРІР‚в„ў. The Theory for working of a H-bridge is given below. H-bridge is the simplest circuit for controlling 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 each side, dedicated to the controlling of a motor. It does not change the signal in any case. An important thing to note is that the L293D simply transmits the signal it receives. The L293D switches it output signal according to the input received from the microprocessor.Р”Р‡or Example: If the microprocessor sends a 1(digital high) to the Input Pin of L293D, then the L293D transmits a 1(digital high) to the motor from its Output Pin. It has two voltage pins, one of which is used to draw current for the working of the L293D and the other is used to apply voltage to the motors. The L293D IC receives signals from the microprocessor and transmits the relative signal to the motors. This is the primary need for the motor driver IC. Thus current cannot be supplied to the motors from the microprocessor. Also most microprocessors operate at low voltages and require a small amount of current to operate while the motors require a relatively higher voltages and current. Motor Driver ICs are primarily used in autonomous robotics only. The workings of the individual pins are explained in detail, later in the tutorial.

L293D has 16 pins, they are comprised as follows: For this tutorial we will be referring the motor driver IC as L293D only. These ICs are designed to control 2 DC motors simultaneously.

#L293d motor driver circuit board series#

The most commonly used motor driver ICРІР‚в„ўs are from the L293 series such as L293D, L293NE, etc.

Motor driver ICs act as an interface between microprocessors in robots and the motors in the robot. A motor driver IC is an integrated circuit chip which is usually used to control motors in autonomous robots.