Arduino Motor Shield Rev3 電機驅動板 原廠公司貨 義大利製

商品說明

Arduino Motor Shield 是一塊Arduino電機驅動板，基於L298雙橋驅動晶片，可用於驅動感性負載（例如繼電器、螺線管、直流電機和步進電機等）。驅動板擁有兩路電機輸出，你可以用它來同時驅動2個直流電機，並單獨控制每個電機的轉速和方向。您還可以測量各個電機的吸收電流。擴展板相容TinkerKit，可以通過將TinkerKit模組插到電路板上來快速創建專案。

Arduino Motor Shield Rev3 技術規格

• 工作電壓：5V ~ 12V
•  電機控制器：L298P，驅動2個DC電機或1個步進電機
• 最大電流：每條通道2A或者最高4A（由外部電源供電）
• 電流感應：1.65 V/A
•  自由運轉停止和刹車功能

電源

Arduino 馬達擴充板必須僅由外部電源供電。因為安裝在擴充板上的 L298 IC 有兩個獨立的電源連接，一個用於邏輯電路，一個用於馬達電源驅動器。所需的馬達電流通常超過 USB 的最大額定電流。

外部（非 USB）電源可以來自交流電轉直流轉接器（壁式電源轉接器）或電池。連接轉接器的方式是將 2.1 毫米中心正極插頭插入 Arduino 板安裝馬達屏蔽的電源插孔，或將連接電源的電線連接到 Vin 和 GND 螺絲端子，注意極性。

為避免損壞安裝擴充板的 Arduino 開發板，我們建議使用 7 至 12V 之間的外部電源。如果您的馬達需要超過 9V 的電壓，我們建議您將擴充板的電源線與安裝擴充板的 Arduino 開發板的電源線分開。這可以透過切斷 位於擴充板背面的「Vin Connect」跳線來實現。螺絲端子處的 Vin 電壓絕對上限為 18V。

電源引腳如下：

• 螺絲接線端子上的 Vin 是連接到屏蔽層的馬達的輸入電壓。連接到此引腳的外部電源也為安裝此板的 Arduino 板供電。剪斷 「Vin Connect」 跳線，即可將此接腳用作馬達的專用電源線。
• GND 螺絲接線端子上的接地。

屏蔽層每個頻道可提供 2 安培電流，總共最多可提供 4 安培電流。

輸入和輸出

此擴充板有兩個獨立的通道，分別稱為 A 和 B，每個通道使用 4 個 Arduino 引腳來驅動或感應馬達。此擴充板上總共使用了 8 個引腳。您可以單獨使用每個通道來驅動兩個直流電機，也可以將它們組合起來驅動一個雙極步進電機。擴充板的接腳（按通道劃分）如下表所示：

• 功能與引腳對應
  • 方向
    • 每聲道 A 腳數：D12
    • 每聲道 B 腳數：D13
  • 脈寬調製
    • 每聲道 A 腳數：D3
    • 每聲道 B 腳數：D11
  • 煞車
    • 每聲道 A 腳數：D9
    • 每聲道 B 腳數：D8
  • 電流感應
    • 每聲道 A 腳數：A0
    • 每聲道 B 腳數：A1

如果您不需要煞車和電流感應功能，並且您的應用需要更多引腳，您可以透過切斷屏蔽背面相應的跳線來停用此功能。

屏蔽上的附加插座說明如下：

螺絲端子 用於連接馬達及其電源。
2 個 TinkerKit 連接器 用於兩個類比輸入（白色），連接到 A2 和 A3。
2 個 TinkerKit 連接器 用於兩個 Aanlog 輸出（中間為橘色），連接到引腳 D5 和 D6 上的 PWM 輸出。
2 個 用於 TWI 介面的TinkerKit 連接器 （白色，4 針），一個用於輸入，另一個用於輸出。

馬達連接

有刷直流馬達。您可以將每根馬達的兩條電線分別連接到 A 通道和 B 通道的 (+) 和 (-) 螺絲端子上，從而驅動兩台有刷直流馬達。這樣，您可以透過將 DIR A 和 DIR B 引腳設定為高電平或低電平來控制馬達的方向，並透過改變 PWM A 和 PWM B 的 佔空比值來控制馬達的速度。 如果將Brake A 和 Brake B 引腳設定為高電平，則會有效地煞車直流電機，而不是透過切斷電源讓馬達減速。您可以透過讀取 SNS0 和 SNS1 引腳的讀數來測量流經直流馬達的電流。每個通道上都會有一個與測得電流成比例的電壓，可以透過類比輸入 A0 和 A1 上的 analogRead() 函數將其讀取為普通的類比輸入。為了方便起見，當通道輸出最大電流（即 2A）時，電壓已校準為 3.3V。

物理特性

馬達屏蔽 PCB 的最大長度和寬度分別為 2.7 英吋和 2.1 英吋。四個螺絲孔可用於將電路板固定在表面或外殼上。請注意，數位引腳 7 和 8 之間的距離為 160 mil（0.16 英吋），而不是其他引腳間距 100 mil 的偶數倍。

Arduino Motor Shield Rev3 文件檔案

• EAGLE FILES IN .ZIP
• SCHEMATICS IN .PDF

Arduino Motor Shield Rev3 技術補充（英文）

以下為原廠英文技術說明，提供進階使用者參考。

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.

• 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

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 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 bipolar stepper motor. The shield’s pins, divided by channel are shown in the table below:

• Function and Pin Mapping
  • Direction
    • Pins per Ch. A: D12
    • Pins per Ch. B: D13
  • PWM
    • Pins per Ch. A: D3
    • Pins per Ch. B: D11
  • Brake
    • Pins per Ch. A: D9
    • Pins per Ch. B: D8
  • Current Sensing
    • Pins per Ch. A: A0
    • Pins per Ch. B: 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 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 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.