Final Project

Debugging PCB

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for blink LEDs and test the output pins with XIAO RP2040

// Define the pin for the LEDs
const int ledPin1 = D9;
const int ledPin2 = D3;
const int ledPin3 = D10;

// The setup function runs once when you press reset or power the board
void setup() {
  // Initialize digital pins ledPin1, ledPin2, and ledPin3 as outputs
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
}

// The loop function runs over and over again forever
void loop() {
  {  
  digitalWrite(ledPin1, HIGH);       // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(ledPin1, LOW);        // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
  } {
  digitalWrite(ledPin2, HIGH);       // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(ledPin2, LOW);        // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
  } {  digitalWrite(ledPin3, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(ledPin3, LOW);        // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
  }
}

Debugging PCB

Testing Inputs

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Soil moisture sensor (analog pin) code in XIAO RP 2040 in Fab&Plant PCB

// constants
const int Moisture_signal = A0; //Analog pin A0 on the XIAO RP2040 for the soil moisture sensor signal
// variables									
int value;

void setup(){
	Serial.begin(9600); // Start the serial communication
}

void loop(){
  // when the plant is watered well the sensor will read a value 380∼400

  value = analogRead(Moisture_signal);  // read analog value
  value = constrain(value,400,1023);    // keep the ranges
  value = map(value,400,1023,100,0);    // map value: 400 will be 100 and 1023 will be 0
  Serial.print("Soil humidity: ");
  Serial.print(value);
  Serial.println("%");
  delay(5000);                          // read every 5 seconds
}

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for blink LED when motion is detected by PIR sensor connected to XIAO RP2040

int pirPin = D1;
int ledPin = D3;
int pirValue;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT);
  pinMode(pirPin, INPUT);
  digitalWrite(ledPin, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  pirValue = digitalRead(pirPin);
  digitalWrite(ledPin, pirValue);
}

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for PIR sensor (HC-SR501) connected to XIAO RP2040

const int pinPIR = D1;
int pirValue;

void setup() {
  // Start serial communication
  Serial.begin(115200);
  // Configure the PIR sensor pin as input
  pinMode(pinPIR, INPUT);
}

void loop() {
  // Read the state of the PIR sensor
  int pirState = digitalRead(pinPIR);

  // If motion is detected
  if (pirState == HIGH) {
	// Print "movement" message on the serial port
	Serial.println("Movement detected");
  } else {
	// Print "off" message on the serial port
	Serial.println("No movement detected");
  }

  // Wait for a brief period before reading again
delay(1000);
}

Start switch test

To test the system start button, I worked with a 5V/3A power supply. Since I couldn't get this source, I used a USB type power cable (which then I connected to a cell phone charger to connect to an electrical outlet) and type C. I cut the type C input and found 4 cables: one red, the other white with black spots, another white and the last green. I identified that the white and green cables were for data, the red for VCC and the white with black GND. Based on this, I connected the VCC and GND cables to the XIAO RP2040 to perform the switch tests. For blinking the LED I used this code in Arduino IDE:

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for blink LED and test the switch that starts system with XIAO RP2040

// Define the pin for the LED
const int ledPin = D10;

// The setup function runs once when you press reset or power the board
void setup() {
  // Initialize digital pin ledPin as an output.
  pinMode(ledPin, OUTPUT);
}

// The loop function runs over and over again forever
void loop() {
  digitalWrite(ledPin, HIGH);     // turn the LED on (HIGH is the voltage level)
  delay(1000);                    // wait for a second
  digitalWrite(ledPin, LOW);      // turn the LED off by making the voltage LOW
  delay(1000);                    // wait for a second
}

Start switch test

Testing Outputs

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for servomotor connected to XIAO RP2040

#include < Servo.h>

#define SERVO_PIN A3

Servo servoMotor;  // Create a servo object to control a servo

void setup() {
  servoMotor.attach(SERVO_PIN);  // Attaches the servo on pin A3 to the servo object
}

void loop() {
  // Move the servo to different positions
  servoMotor.write(0);    // Move the servo to 0 degrees
  delay(1000);            // Wait for 1 second
  servoMotor.write(90);   // Move the servo to 90 degrees
  delay(1000);            // Wait for 1 second
  servoMotor.write(180);  // Move the servo to 180 degrees
  delay(1000);            // Wait for 1 second
}

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for smooth transition of LED strips using PWM with XIAO RP2040

// Define the pin for the LED strips
const int ledPin1 = D9;   // Define the pin for blue LED strip
const int ledPin2 = D10;  // Define the pin for green LED strip

// The setup function runs once when you press reset or power the board
void setup() {
  // Initialize digital pins ledPin1 and ledPin2 as outputs
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
}

// The loop function runs over and over again forever
void loop() {
  // Gradually increase brightness
  for (int brightness = 0; brightness <= 255; brightness++) {
	analogWrite(ledPin1, brightness);
	analogWrite(ledPin2, brightness);
	delay(15); // Adjust delay for desired transition speed
  }

  // Gradually decrease brightness
  for (int brightness = 255; brightness >= 0; brightness--) {
	analogWrite(ledPin1, brightness);
	analogWrite(ledPin2, brightness);
	delay(15); // Adjust delay for desired transition speed
  }
}

//Fab Academy 2024 - Fab Lab Peru - Maria Angela Mejia
//Code for Fab&Plant PCB with a XIAO RP2040

#include < Servo.h>

#define HUMIDITY_SENSOR A0
#define PIR_SENSOR D1
#define BLUE_LED D9
#define GREEN_LED D10
#define SERVO_PIN A3

Servo servoMotor;

void setup() {
  pinMode(HUMIDITY_SENSOR, INPUT);
  pinMode(PIR_SENSOR, INPUT);
  pinMode(BLUE_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);

  servoMotor.attach(SERVO_PIN);

  //LED strips are initially turned off
  digitalWrite(BLUE_LED, HIGH);
  digitalWrite(GREEN_LED, HIGH);  
}

void loop() {
  // Read sensors
  int humidityValue = analogRead(HUMIDITY_SENSOR);
  int pirState = digitalRead(PIR_SENSOR);

  // Map humidity value to percentage
  int humidityPercentage = map(humidityValue, 1023, 0, 0, 100);

  // If humidity is less than 40% and motion is detected, turn on blue LED
  if (humidityPercentage < 40 && pirState == HIGH) {
	digitalWrite(BLUE_LED, LOW);
	digitalWrite(GREEN_LED, HIGH);
	// Ensure servo motor is off
	servoMotor.write(0);
  } 
  // If humidity is 40% or higher and motion is detected, turn on green LED
  else if (humidityPercentage >= 40 && pirState == HIGH) {
	digitalWrite(BLUE_LED, HIGH);
	digitalWrite(GREEN_LED, LOW);
	// Rotate servo motor if humidity is 40% or higher
	servoMotor.write(0);   // Move the servo to 0 degrees
	delay(1000);           // Wait for 1 second
	servoMotor.write(90);  // Move the servo to 90 degrees
	delay(1000);           // Wait for 1 second
	servoMotor.write(180); // Move the servo to 180 degrees
	delay(1000);           // Wait for 1 second
	servoMotor.write(90);  // Move the servo back to 90 degrees
	delay(1000);           // Wait for 1 second
  } 
  // If no motion is detected, turn off both LEDs and servo motor
  else {
	digitalWrite(BLUE_LED, HIGH);
	digitalWrite(GREEN_LED, HIGH);
	servoMotor.write(0);
  }
}