L9110 Dual Fan Driver Board for Fire Safety Robot – STM32/Arduino Compatible

Description

The L9110 Dual Fan Driver Board is a compact motor driver module designed for fire-fighting robots, ventilation systems, and educational robotics projects. It integrates the L9110 dual H-bridge motor driver IC with a DC brushed fan and propeller, allowing a microcontroller (Arduino, STM32, ESP32) to control the fan’s speed and direction via simple digital/PWM signals.

The L9110 chip’s dual H-bridge architecture enables bidirectional control: setting one input HIGH and the other LOW drives the fan forward; reversing the inputs drives it backward; setting both inputs to the same level stops the motor. Speed is controlled by applying a PWM signal to the input pins—higher duty cycle means faster rotation. This makes the module suitable for applications requiring precise airflow control, such as aiming a fire-extinguishing fan at a flame.

The module is specifically marketed for fire-fighting robots, with suppliers noting it can “easily blow out a lighter flame at 20cm distance”. The compact PCB and pre-mounted fan simplify integration into small robot chassis. The driver accepts TTL/CMOS logic levels, making it directly compatible with 3.3V and 5V microcontrollers without level shifting.

Critical limitations: The L9110 chip has a continuous output current of 800mA per channel and a peak current of 1.5A. Do not exceed these ratings—stalling the fan or using a higher-power motor will damage the driver. The module requires a separate external power supply for the fan; it cannot be powered from the microcontroller’s 5V pin if the fan draws significant current. The L9110S chip does not provide isolation between the motor supply and logic supply—use a stable, adequately rated power source to avoid brownouts or damage.

Features

• Dual H-Bridge Driver: L9110S chip enables forward/reverse/stop control and PWM speed regulation.

• Pre-Mounted 75mm Fan: Ready-to-use airflow source for fire-extinguishing or cooling applications.

• Wide Logic Compatibility: TTL/CMOS inputs work directly with Arduino, STM32, ESP32, and 3.3V/5V systems.

• Simple 2-Pin Control per Channel: IN1/IN2 (or A-IA/A-IB) determine direction; PWM on either pin controls speed.

• Compact Form Factor: Module dimensions approximately 50×26×15mm, suitable for small robots.

• Mounting Holes: Pre-drilled holes for secure installation on robot chassis.

• Low Cost: Inexpensive solution for educational and hobbyist robotics.

• Fire Robot Proven: Widely used in flame-extinguishing robot projects.

Technical Specifications