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An h-bridge motor controller enables a control signal to drive a much larger load in either polarity, allowing Meadow to drive DC motors in forward or reverse from an external power supply. Using pulse-width-modulation (PWM) as the control signal, provides forward or reverse control, and variable speeds in either direction.

Code Example

protected HBridgeMotor motor1;

public override Task Initialize()

motor1 = new HBridgeMotor
a1Port: Device.CreatePwmPort(Device.Pins.D07, new Frequency(100, Frequency.UnitType.Hertz)),
a2Port: Device.CreatePwmPort(Device.Pins.D08, new Frequency(100, Frequency.UnitType.Hertz)),
enablePort: Device.CreateDigitalOutputPort(Device.Pins.D09)

return Task.CompletedTask;

public override async Task Run()

while (true)
// Motor Forwards
motor1.Power = 1f;
await Task.Delay(1000);

// Motor Stops
motor1.Power = 0f;
await Task.Delay(500);

// Motor Backwards
motor1.Power = -1f;
await Task.Delay(1000);

Sample project(s) available on GitHub

Wiring Example

Though h-bridge motor controllers come in various form factors, they typically share the following pins and usages:

Motor Controller PinDescription
1,2EN or ENABLE AMotor 1 enable. This should be configured as enablePin in the constructor, and it controls whether or not the motor is powered. The HBridgeMotor driver will automatically set this to high (enabled) when the speed is not zero. This is also enabled when IsNeutral is set to false, as powering the motor will cause it to brake when the speed is set to 0.

On the L2N93E and SN754410 chips, this is labeled as 1,2EN, and on the L298N, it's typically labeled as ENABLE A.
3,4EN or ENABLE BMotor 2 enable pin. If you are driving two motors, you'll need two HBridgeMotor objects, as shown in the example below.
[1,2]A or INPUT [1,2]Motor 1 control inputs. These are configured as the a1Pin and a2pin constructor parameter. These are the low-voltage control signals for motor 1 forward and reverse.

On the L2N93E and SN754410 chips, this is labeled as 1A and 2A, and on the L298N chip, it's typically labeled as INPUT 1 and INPUT 2.
[3,4]A or INPUT [3,4]Motor 2 control inputs.
GROUND or GNDCommon/ground. Both the motor power supply and the logic power supply should be tied together on the same common ground plane.
VCC2, +12V, or VsThis is the positive voltage supply that drives the motors. Depending on the chip used, this may be anywhere from 4.5V up to 50V.
VCC1, +5V, or VSSThis is the logic voltage supply that powers the chip logic. This should be tied into the 5V voltage pin on the Meadow.

The following breadboard diagram illustrates connecting two motors to an h-bridge chip that uses a external power supply to drive the motors:

Class HBridgeMotor

Generic h-bridge motor controller.

Assembly: Meadow.Foundation.dll
View Source
public class HBridgeMotor : IDCMotor





When true, the wheels spin "freely"

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public bool IsNeutral { get; set; }


The power applied to the motor, as a percentage between -1.0 and 1.0.

View Source
public float Power { get; set; }


The frequency of the PWM used to drive the motors. Default value is 1600.

View Source
public Frequency PwmFrequency { get; }


Not all motors are created equally. This number scales the Speed Input so that you can match motor speeds without changing your logic.

View Source
public float MotorCalibrationMultiplier { get; set; }



PWM port for left motor

View Source
protected IPwmPort motorLeftPwm


PWM port for right motor

View Source
protected IPwmPort motorRighPwm


Digital output port to enable h-bridge

View Source
protected IDigitalOutputPort enablePort


  • Meadow.Peripherals.Motors.IDCMotor