The Arduino Motor Shield is based on the L298 ( Datasheet ), Which is a Dual Full-Bridge Driver Designed to drive as Inductive loads SUCH Relays, Solenoids, DC and Stepping motors. It lets you drive Two DC motors with your Arduino board, Controlling the Speed and direction of each one Independently. You CAN Also measure the absorption of each Motor current Motor, Among other Features. The Shield is TINKERKIT compatible, Which means you CAN Quickly create projects by plugging TINKERKIT modules to the board.
Operating Voltage:5V to 12V
Motor controller:L298P , Drives 1 or 2 DC motors Stepper Motor
Max current:2A per channel or 4A max (with external power supply)
Current sensing:1.65V / A
The Arduino Motor Shield must be powered only by an external power supply. Because the L298 IC mounted on the shield has two separate power connections, one for the logic and one for the motor supply driver. The required motor current often exceeds the maximum USB current rating.
External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the Arduino's board power jack on which the motor shield is mounted or by connecting the wires that lead the power supply to the Vin and GND screw terminals, taking care to respect the polarities.
To avoid possible damage to the Arduino board on which the shield is mounted, we reccomend using an external power supply that provides a voltage between 7 and 12V. If your motor require more than 9V we recommend that you separate the power lines of the shield and the Arduino board is mounted on Which the Shield. This is Possible by Cutting the "Vin Connect" Jumper Placed on the back of the Side Shield. The absolute limit for the Vin at the Screw Terminals is 18V.
The power pins are as follows:
Vin on the Screw Terminal Block, is the input to the Motor Voltage connected to the Shield. An external power supply connected to this pin Also Provide power to the Arduino board on Which is mounted. By Cutting the "Vin Connect" Jumper you make this a dedicated power line for the motor.
GND Ground on the Screw Terminal Block.
The shield can supply 2 amperes per channel, for a total of 4 amperes maximum.
Input and Output
This shield has two separate channels, called A and B, that each use 4 of the Arduino pins to drive or sense the motor. In total there are 8 pins in use on this shield. You can use each channel separately to drive two DC motors or combine them to drive one unipolar stepper motor.
The shield's pins, divided by channel are shown in the table below:
If you do not need the Brake and the Current Sensing and you also need more pins for your application you can disable this features by cutting the respective jumpers on the back side of the shield.
The additional sockets on the shield are described as follow:
Screw Terminal to Connect the motors and Their power supply.
2 TINKERKIT connectors for Two Analog Inputs (in white), connected to A2 and A3.
2 TINKERKIT connectors for Two Aanlog Outputs (in orange in the Middle), connected to PWM outputs on D5 and D6 pins.
2 TINKERKIT connectors for the TWI interface (in white with 4 pins), the other one for input and one for output.
Brushed DC Motor . You CAN drive Brushed DC motors Two by Two Connecting the wires of each one in the (+) and (-) for each Channel Screw Terminals A and B. In this Way you CAN Control ITS direction by setting HIGH or LOW the DIR A and B DIR pins, you CAN VARYING Control the Speed by the PWM A and B PWM Duty Cycle values. The Brake A and B Brake pins, if set HIGH, the DC motors Brake Will Effectively Rather than let down by Them SLOW Cutting the power. You CAN measure the current going through the DC Motor by reading the SNS0 and SNS1 pins. On each Channel Will be a Voltage Proportional to the Measured current, Which CAN be Read as a normal Analog input, through the function analogRead ( ) on the analog input A0 and A1. For your convenience it is calibrated to be 3.3V when the channel is delivering its maximum possible current, that is 2A.
The maximum length and width of the Motor Shield PCB are 2.7 and 2.1 inches respectively. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16 "), not an even multiple of the 100 mil spacing of the other pins.
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