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Lesson 31: Centrifugal Pump

In this lesson, you’ll learn how to control a centrifugal pump with an ESP32 Development Board and an L9110 motor control board. We’ll cover setting up and using two pins to operate the motor, causing the pump to spin in one direction for 5 seconds before shutting off. This project provides hands-on experience in managing motor operations and understanding digital signals in microcontroller programming, making it ideal for beginners in electronics and programming.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Centrifugal Pump	-
L9110 Motor Driver Module	-
Breadboard	BUY

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 = 26;
const int motorB_2A = 25;
```
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);
}
```