Wemos and L9110 Fan module example

In this example we connect an Arduino to a L9110 fan module.

The L9110 is anASIC device control and drive motor design two-channel push-pull power amplifier discrete circuits integrated into a monolithic IC, peripheral devices and reduce the cost, improve the reliability of the whole. This chip has two TTL / CMOS compatible with the level of the input, with good resistance; two output terminals can directly forward and reverse movement of the drive motor, it has a large current driving capability, each channel through 750 ~ 800mA of continuous current, peak current capability up to 1.5 ~ 2.0A; while it has a low output saturation voltage; built-in clamp diode reverse the impact of the current release inductive load it in the drive relays, DC motors, stepper motor or switch power tube use on safe and reliable. L9110 is widely used in toy car motor drives, stepper motor drive and switching power tube circuit.

This is a commonly found, basic low cost module which simply consists of an L9110 chip and a small motor attached. You need 4 connections between the wemos and the module. VCC, GND , INA and INB.

L9110-fan-module

Lets look at how to connect the Wemos to the module

 

Wemos Pin L9110 Fan motor pin
3v3 Vcc
Gnd Gnd
Wemos D7 INA
Wemos D8 INB

 

Code

No libraries needed in this example, fairly basic example this one, upload the sketch and the fan will just run

int INA = 9; 
int INB = 8;
 
void setup() 
{ 
pinMode(INA,OUTPUT); 
pinMode(INB,OUTPUT); 
}
 
void loop() 
{ 
digitalWrite(INA,LOW);
digitalWrite(INB,HIGH); 
delay(1000); 
}

 

Link
L9110 Fan Module for Arduino

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