How to Use l9110: Examples, Pinouts, and Specs

The L9110 Dual H-Bridge Motor Driver Module, manufactured by i am (Part ID: L9110 Dual Module), is a compact and efficient motor driver IC designed for controlling the direction and speed of DC motors and stepper motors. It features two H-bridge circuits, allowing it to drive two motors simultaneously. This module is widely used in robotics, automation, and other motor control applications due to its simplicity and reliability.

• Robotics: Driving wheels or robotic arms
• Automation systems: Conveyor belts, actuators
• DIY projects: Remote-controlled cars, drones
• Stepper motor control for CNC machines or 3D printers

The L9110 module has a total of 6 pins for interfacing with the microcontroller and motors.

1. Power Supply: Connect the VCC pin to a power source (2.5V to 12V) and the GND pin to ground.
2. Motor Connections: Connect the terminals of Motor A to Motor A+ and Motor A-, and Motor B to Motor B+ and Motor B-.
3. Control Signals: Use the A-IA, A-IB, B-IA, and B-IB pins to control the direction and speed of the motors:
   • To move a motor forward, set IA = HIGH and IB = LOW.
   • To move a motor backward, set IA = LOW and IB = HIGH.
   • To stop the motor, set both IA and IB to LOW.
4. Microcontroller Interface: Connect the control pins to a microcontroller (e.g., Arduino UNO) to send the required logic signals.

• Ensure the power supply voltage matches the motor's operating voltage.
• Do not exceed the maximum current rating of 800mA per channel (continuous) or 1.5A (peak).
• Use appropriate heat dissipation methods if operating near the peak current limit.
• Avoid short circuits between motor terminals or control pins.

Below is an example code snippet to control two DC motors using the L9110 module and an Arduino UNO:

// Define control pins for Motor A
const int motorA_IA = 3; // Connect to A-IA pin on L9110
const int motorA_IB = 4; // Connect to A-IB pin on L9110

// Define control pins for Motor B
const int motorB_IA = 5; // Connect to B-IA pin on L9110
const int motorB_IB = 6; // Connect to B-IB pin on L9110

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

void loop() {
  // Move Motor A forward
  digitalWrite(motorA_IA, HIGH);
  digitalWrite(motorA_IB, LOW);

  // Move Motor B backward
  digitalWrite(motorB_IA, LOW);
  digitalWrite(motorB_IB, HIGH);

  delay(2000); // Run motors for 2 seconds

  // Stop both motors
  digitalWrite(motorA_IA, LOW);
  digitalWrite(motorA_IB, LOW);
  digitalWrite(motorB_IA, LOW);
  digitalWrite(motorB_IB, LOW);

  delay(2000); // Wait for 2 seconds
}

• Adjust the pin numbers in the code to match your Arduino wiring.
• Use analogWrite() instead of digitalWrite() for speed control via PWM.

1. Motors Not Running:

   • Check the power supply voltage and ensure it matches the motor's requirements.
   • Verify the control signals from the microcontroller are correct.
   • Ensure proper connections between the motor terminals and the L9110 module.

2. Overheating:

   • Ensure the current drawn by the motors does not exceed the module's maximum rating.
   • Use a heat sink or cooling fan if necessary.

3. Erratic Motor Behavior:

   • Check for loose or faulty connections.
   • Ensure the ground (GND) is properly connected between the module and the microcontroller.

Q: Can the L9110 drive stepper motors?
A: Yes, the L9110 can drive stepper motors by controlling the two H-bridge channels in sequence. However, additional logic or a library may be required for precise stepper motor control.

Q: Can I use the L9110 with a 3.3V microcontroller?
A: Yes, the L9110 is compatible with 3.3V logic levels, but ensure the motor's power supply voltage is within the module's range (2.5V to 12V).

Q: What is the maximum motor voltage supported?
A: The L9110 supports motor voltages up to 12V. Ensure the motor's voltage rating matches the power supply.

Q: Can I control motor speed with the L9110?
A: Yes, motor speed can be controlled using PWM signals on the control pins (IA and IB).

This concludes the documentation for the L9110 Dual H-Bridge Motor Driver Module.