Lesson 31: Centrifugal Pump¶

In this lesson, you’ll learn how to control a centrifugal pump with an Arduino Uno R3 or R4 and an L9110 motor control board. You’ll discover how to set up and program the Arduino to start the pump in one direction, run it for a specific duration, and then stop it. This hands-on experience is ideal for beginners and offers fundamental insight into managing motor operations and understanding output controls in Arduino projects.

Required Components¶

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
Centrifugal Pump	-
L9110 Motor Driver Module	-

Wiring¶

Code¶

Code Analysis¶

Two pins are defined for controlling the motor, specifically motorB_1A and motorB_2A. These pins will connect to the L9110 motor control board to control the direction and speed of the motor.
```
const int motorB_1A = 9;
const int motorB_2A = 10;
```
Configuring the pins and controlling the motor:
- The setup() function initializes the pins as OUTPUT which means they can send signals to the motor control board.
- The analogWrite() function is used to set the motor speed. Here, setting one pin to HIGH and the other to LOW makes the pump spin in one direction. After a 5-second delay, both pins are set to 0, turning off the motor.
```
void setup() {
   pinMode(motorB_1A, OUTPUT);  // set pump pin 1 as output
   pinMode(motorB_2A, OUTPUT);  // set pump pin 2 as output
   analogWrite(motorB_1A, HIGH);
   analogWrite(motorB_2A, LOW);
   delay(5000);// wait for 5 seconds
   analogWrite(motorB_1A, 0);  // turn off the pump
   analogWrite(motorB_2A, 0);
}
```