🌬️ Fan Module

📌 Description

The L9110 fan module is a small motor driver board that can control a DC motor or fan. It uses two pins to decide the direction of rotation. By switching signals, the fan can spin forward or backward.

🎯 Use

In our projects, the L9110 is used to:

• Control cooling fans.
• Spin small propellers or wheels.
• Demonstrate motor direction control with simple code.

👉 Think of the L9110 as the robot’s wind machine — it makes air flow or spins parts when commanded.

Module parameters

Pin name	Description
G	GND (Power Input Negative)
V	VCC (Power Input Cathode)
INA	Motor control signal pin A
INB	Motor control signal pin B

• Supply voltage: 3.3V/5V
• Connection: PH2.0 terminal wire
• Installation method: double screw fixing

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🖥️ Code Explanation

f

import machine
import time

pin16 = machine.Pin(16, machine.Pin.OUT)   # Control pin A
pin17 = machine.Pin(17, machine.Pin.OUT)   # Control pin B

while True:
    pin16.value(1)     # Fan spins forward
    pin17.value(0)
    time.sleep(1)      # Keep spinning for 1 second

    pin16.value(0)     # Fan spins backward
    pin17.value(1)
    time.sleep(1)      # Keep spinning for 1 second

Step by Step

1. import machine, time → Tools to control pins and add pauses.
2. pin16 and pin17 → These two pins decide the fan’s direction.
3. while True: → Loop that repeats forever.
4. pin16.value(1), pin17.value(0) → Fan spins forward for 1 second.
5. pin16.value(0), pin17.value(1) → Fan spins backward for 1 second.
   👉 Together, the fan alternates between forward and backward rotation.

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✅ Conclusion of the Test

• If the fan spins forward for 1 second, then backward for 1 second, the program is working correctly.
• This test shows how the L9110 can control motor direction using two pins.
• Later, you can adjust the timing or combine with sensors to make the fan react to temperature, motion, or other inputs.