L298P,,Motor,Shield DC Stepper Motor Drive Module

The optimized version of the motor drive module of the Arduino Motor Shield R3 has the following features:

 

1, using L298P double-ended full-bridge driver chip, can independently drive two DC, stepper motor or relay.

2. The motor current value of each channel can be measured in real time.

3, fully compatible with Arduino UNO R3, multi-layer plug-in design, direct current reading through analog IO.

4, compatible with TinkerKit, you can directly plug and unplug it.

Technical specifications:

Working voltage: 5V-12V

Motor controller: 2 DC motors or 1 stepper motor

Maximum current: 2A/路, 4A maximum (external power input)

Current sensing: 1.65V/A

Reference: http://arduino.cc/en/Main/ArduinoMotorShieldR3

 

Ower

The Arduino Motor Shield must be powered only by an external power supply. The same 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.

 

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:

 

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 Aand  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.

 

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.

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