User’s Guide

L9110S Dual H‑Bridge Motor Driver Module

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1. Product Overview

The L9110S is a compact dual‑channel motor driver IC mounted on a breakout board. It can control two DC motors or one small stepper motor, allowing forward/reverse motion and speed control via PWM signals.

• Operating Voltage: 2.5V – 12V DC
• Continuous Current: ~800mA per channel (peak up to ~1.5A)
• Control Method: Logic inputs (HIGH/LOW or PWM)
• Applications: Educational robots, toys, DIY kits, radio dial motors

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2. Pinout

Typical L9110S module has two channels (A & B):

Pin	Function
VCC	Power supply (2.5–12V)
GND	Ground
A‑1A	Input 1 for Motor A
A‑1B	Input 2 for Motor A
B‑1A	Input 1 for Motor B
B‑1B	Input 2 for Motor B
Motor A	Output terminals for Motor A
Motor B	Output terminals for Motor B

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3. Control Logic

Each motor channel works as an H‑bridge:

IN1	IN2	Motor Action
HIGH	LOW	Forward
LOW	HIGH	Reverse
LOW	LOW	Stop (coast)
HIGH	HIGH	Brake

• Apply PWM on one input while holding the other LOW → speed control.

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4. Wiring Guide (Arduino Example)

1. Connect VCC → Arduino 5V (or external supply within 2.5–12V).
2. Connect GND → Arduino GND.
3. Connect A‑1A, A‑1B → Arduino digital pins (e.g., D8, D9).
4. Connect Motor A terminals → DC motor.
5. Repeat for Motor B if using two motors.

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5. Example Arduino Code

int IN1 = 8;
int IN2 = 9;

void setup() {
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
}

void loop() {
  // Forward
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  delay(2000);

  // Reverse
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  delay(2000);

  // Stop
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  delay(2000);
}

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6. Applications

• Small robots: Drive two DC motors for wheels.
• Stepper motor control: Sequence inputs for 2‑phase stepper motors.
• Educational kits: Demonstrate H‑bridge logic and PWM speed control.
• DIY projects: Fan control, toy car motors, tuning knobs.

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7. Best Practices

• Do not exceed 12V supply or 1.5A peak current.
• Use PWM from microcontroller for smooth speed control.
• Add flyback diodes if driving inductive loads beyond spec.
• Keep wiring short to reduce noise and voltage drop.

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