L9110S Dual Channel H-Bridge Motor Driver Module - 2.5V-12V DC Controller

Specifications

• Driver Chips: 2 x L9110S ASIC Motor Drivers

• Operating Voltage: 2.5V to 12V DC

• Max Continuous Current: ~800mA per channel

• Peak Output Current: 1.5A per channel (brief bursts)

• Motor Channels: 2 Independent DC Motors (or 1 4-wire 2-phase stepper)

• Input Interface: 6-Pin standard 2.54mm header

• Output Interface: Two 2-pin green screw terminals

• Indicator: Onboard power LED indicator

Key Applications and Projects

• 2-Wheel Drive Smart Cars: Independently controlling the left and right wheels for forward, reverse, and differential steering.

• Miniature Water Pumps: Turning 3V-6V submersible pumps on and off in automated plant watering systems.

• Automated Blinds/Curtains: Driving a small stepper motor or geared DC motor to pull curtains open or closed based on light sensors.

Unlock New Capabilities (Project Evolution)

• Speed Control Upgrade: Instead of using simple HIGH/LOW logic, apply a PWM (Pulse Width Modulation) signal to the input pins to precisely control the RPM of your motors, allowing your robot to turn smoothly instead of jerking.

• Stepper Integration: Ditch the two DC motors and connect the four wires of a small stepper motor (like a NEMA 14) directly to the OA1/OB1 and OA2/OB2 terminals for precise positional stepping.

Package Includes:

• 1 x L9110S Dual Channel H-Bridge Motor Driver Module

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What is the voltage range for this module? It operates reliably on any DC voltage between 2.5V and 12V.

2. How much current can it handle? Each channel can supply up to 800mA of continuous current, with peak bursts up to 1.5A.

3. How do I connect the motors? Connect the two wires of your first DC motor to the OA1 and OB1 green screw terminals, and the second motor to OA2 and OB2.

4. Does motor polarity matter at the screw terminals? No, the screw terminals are non-directional; if the motor spins the wrong way, you can either reverse the wires in the terminal or reverse your HIGH/LOW logic in code.

5. How do I make the motor go forward? For Motor A, set input AIA to HIGH and AIB to LOW.

6. How do I make the motor reverse? Simply invert the signal: set input AIA to LOW and AIB to HIGH.

7. How do I stop the motor? To brake or stop the motor, set both inputs (e.g., AIA and AIB) to LOW simultaneously.

8. What are the 6 pins for? The header pins are B1-B and B1-A (Motor B control), GND (Ground), VCC (2.5-12V Power), and A1-A and A1-B (Motor A control).

9. Can I control motor speed with this? Yes, by applying a PWM (Pulse Width Modulation) signal from your Arduino to the input pins instead of a solid HIGH signal.

10. Do I need a separate power supply for the motors? Yes, it is highly recommended to connect a battery pack directly to the VCC and GND pins rather than powering motors through your Arduino's 5V pin, which could damage the microcontroller.

11. Can it drive a stepper motor? Yes, it can drive one standard 4-wire, 2-phase stepper motor by treating the two coils as two separate DC motors.

12. What does the small LED do? The onboard LED acts as a power indicator light to confirm the module is receiving VCC/GND power.

13. Why use this instead of an L298N? The L9110S is much smaller, cheaper, and operates at lower voltages (down to 2.5V), making it better for tiny, low-power robots. However, it handles less current than the L298N.

14. Is there voltage drop? Like all bipolar H-bridges, there is a small voltage drop, but it is less pronounced than older chips like the L298N.

15. Can I use this with a Raspberry Pi? Yes, the logic inputs can be triggered by the 3.3V GPIO pins of a Raspberry Pi.

16. Are the header pins pre-soldered? Yes, the 6-pin male header and green screw terminals typically come fully assembled and soldered to the board.

17. What happens if I set both inputs to HIGH? Setting both inputs to HIGH will actively brake the motor, similar to setting both to LOW.

18. Can it run standard yellow TT gear motors? Yes, it is the perfect driver for standard 3V-6V TT gear motors commonly used in hobby robotics.

19. Does it have thermal protection? The chips do not have robust thermal shutdown like larger drivers; avoid stalling the motors or exceeding 800mA for long periods.

20. Can I parallel the channels to drive one larger motor? It is generally not recommended to parallel the L9110S outputs, as slight timing differences can cause a short circuit between the chips.