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Adeept Motor Shield Introduction

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2017-01-10 19:12:17

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Adeept Motor Shield Introduction

Overview

The Adeept Motor Shield is based on the L298 , 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. External expansion has two steering gear interface and wireless communication interface,You can install both the NRF24L01 communication module and the Bluetooth communication module.

The shield is Arduino Kit compatible, which means you can quickly create projects by plugging Arduino modules to the board.All IO pins are extended to facilitate the development needs of users and we provide a complete schematic and reference routines. If you encounter any problems in your use, we will work with you to solve the problem.Use our products to make your development more interesting.


Technical specs

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

Servo interface  2

Wireless communication interface  NRF24L01 & Bluetooth

Free running stop and brake function

Power

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 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.


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 6 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 D8 D5

PWM D7 D6

Current Sensing A0 A1


Motors Connection

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 SNS 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 A 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 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 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.






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