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Arduino® Motor Shield Rev3 雙路全橋式驅動 步機/直流電機 (A000079)(義大利原廠)
NT$1,189
運費NT$50
條碼01546205
產品說明

※本產品原廠代理從國外進口,有些交期較長,下訂前請詢問!

  Arduino Motor Shield Rev3 (A000079)

 

 

 

Overview

The Arduino Motor Shield is based on the L298 (datasheet), which is a dual full-bridge driver designed to drive inductive loads such as 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 motor current absorption of each motor, among other features. The shield is TinkerKit compatible, which means you can quickly create projects by plugging TinkerKit modules to the board. 
 

 

Summary

 Operating Voltage

 5V to 12V

 Motor controller

 L298P, Drives 2 DC motors or 1 stepper motor

 Max current

 2A per channel or 4A max (with external power supply)

 Current sensing

 1.65V/A

 Free running stop and brake function

Schematic & Reference Design

Power

Input and Output

    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 on which the shield is mounted. This is possible by cutting the "Vin Connect" jumper placed on the back side of the 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 voltage to the motor 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. 

    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 bipolar stepper motor. 

    The shield's pins, divided by channel are shown in the table below:

Function

pins per Ch. A

pins per Ch. B

Direction

D12

D13

PWM

D3

D11

Brake

D9

D8

Current Sensing

A0

A1

    If you don't 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 pins D5 and D6.
  • 2 TinkerKit connectors for the TWI interface (in white with 4 pins), one for input and the other one for output.

Motors connections

    Brushed DC motor. You can drive two Brushed DC motors by connecting the two wires of each one in the ( ) and (-) screw terminals for each channel A and B. In this way you can control its direction by setting HIGH or LOW the DIR A and DIR B pins, you can control the speed by varying the PWM A and PWM B duty cycle values. The Brake A and Brake B pins, if set HIGH, will effectively brake the DC motors rather than let them slow down by 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.

USB Overcurrent Protection

    The Arduino Uno has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

Physical Characteristics

    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. 

Conformity Declaration:FCC/CE

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本商品上架日期:2013-05-23.
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