How to Use L9110: Examples, Pinouts, and Specs

The L9110 is an integrated circuit designed to control the direction and speed of DC motors. It consists of two H-bridge drivers that can independently control two small to medium-sized DC motors. The L9110 is widely used in robotics, automation projects, and various DIY applications due to its simplicity and efficiency.

• Robotics: Driving wheels or tracks.
• Automation: Controlling actuators and mechanical systems.
• Hobby Projects: RC cars, drones, and other motorized gadgets.

• Operating Voltage: 2.5V to 12V
• Output Current: Up to 800mA per channel
• Peak Output Current: 1.5A (for a short duration)
• Standby Control to Save Power
• Input Logic Voltage: 2.5V to 12V

1. Connect the motor power supply to the Vcc and GND pins.
2. Connect the motors to the output pins A-O1/A-O2 and B-O1/B-O2.
3. Apply logic signals to the input pins A-IA/A-IB and B-IA/B-IB to control the motors.

• Ensure the power supply voltage and motor current do not exceed the IC's ratings.
• Use a proper heat sink if operating near the maximum current rating.
• Avoid shorting the output pins as it may damage the IC.
• Use flyback diodes across the motors to protect the IC from voltage spikes.

// Define the L9110 control pins connected to the Arduino
const int motorA_IA = 2;
const int motorA_IB = 3;
const int motorB_IA = 4;
const int motorB_IB = 5;

void setup() {
  // Set the motor control pins as outputs
  pinMode(motorA_IA, OUTPUT);
  pinMode(motorA_IB, OUTPUT);
  pinMode(motorB_IA, OUTPUT);
  pinMode(motorB_IB, OUTPUT);
}

void loop() {
  // Rotate Motor A clockwise
  digitalWrite(motorA_IA, HIGH);
  digitalWrite(motorA_IB, LOW);
  delay(1000); // Run for 1 second

  // Rotate Motor A counterclockwise
  digitalWrite(motorA_IA, LOW);
  digitalWrite(motorA_IB, HIGH);
  delay(1000); // Run for 1 second

  // Stop Motor A
  digitalWrite(motorA_IA, LOW);
  digitalWrite(motorA_IB, LOW);
  delay(1000); // Stop for 1 second

  // The same logic can be applied to control Motor B using motorB_IA and motorB_IB
}

• Motor not running: Check power supply and connections.
• Overheating: Ensure current is within limits and use a heat sink.
• Inconsistent motor speed: Verify the input logic levels and power supply stability.

• Double-check wiring against the pin configuration.
• Measure the voltage at the motor terminals to ensure proper operation.
• Use a multimeter to check for shorts or open circuits in the connections.

Q: Can the L9110 drive stepper motors? A: No, the L9110 is designed for DC motors and does not have the necessary control for stepper motors.

Q: What is the maximum frequency for PWM control? A: The L9110 can typically handle PWM frequencies up to 100kHz, but for most applications, a frequency of around 1kHz to 25kHz is sufficient.

Q: Can I use the L9110 without a microcontroller? A: Yes, you can use manual switches or logic gates to control the inputs, but a microcontroller like an Arduino provides more flexibility and control options.