Programming: Programming the XIAO RP2040 in Fab&Plant PCB.

//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);
  }
}

System: The mechanism for cultivating plants and indicating their watering needs.

What materials and components will be used?

Frame:

• Wood PLA filament
• PLA filament
• 3mm plywood
• 4mm cardboard
• Felt fabric
• Silicone rubber
• Screws
• Glue

Electronics:

• XIAO RP2040 (1 unit)
• SMD LED (3 units)
• 0K ohm resistor (2 units)
• 1K ohm resistor (3 units)
• Several pin headers
• Servo motor (1 unit)
• Green LED strip (1 unit)
• Blue LED strip (1 unit)
• PIR sensor (1 unit)
• Water sensor (1 unit)

Where will they come from?

The frame materials came from local suppliers; the Wood PLA filament from SUNLU; electronic items from Paruro Market, and the XIAO RP2040 from Digikey.

How much will they cost?

Fab&Plant BOM

What parts and systems will be made?

I made the frame, electronics, programming and the mechanism for cultivating plants and indicating their watering needs.

What processes will be used?

• Computer aided design
• Laser cutting
• 3D printing
• Molding and casting
• Lithophane
• Electronics design
• PCB milling
• Soldering, testing, debugging
• Embedded programming
• Assembly
• Iteration

What questions need to be answered?

• Does Fab&Plant communicate the plants watering need well?
• How long does it take before Fab&Plant needs watering again?
• What is the maximum amount of water the system requires?

How will it be evaluated?

The objective of Fab&Plant is to reconnect ordinary citizens in urban environments with nature. Thanks to its functionality, I believe I have achieved this goal.

Project Development (2/2)

This week, I documented my final project, detailing its purpose, functionality, components, cost, processes involved, and evaluation criteria.

Assignment

• Complete your final project tracking your progress

Learning Outcomes

• Create the project plan
• Track the progress of your project
Summarise and communicate the essence of your project development

Have you answered these questions?

What tasks have been completed?

I have completed all the necessary tasks to ensure the prototype of my final project works.

Fab&Plant schedule

What tasks remain?

I must finish the slide and video for my final presentation, in addition to the documentation on my final project page.

What has worked? what hasn't?

In the process of creating this product, the functions I initially envisioned changed. In the end, they all worked, though not in the way I originally imagined.

What I would like to improve is the movement of the pots. Initially, all three pots were supposed to move. I haven't managed to get the top pot to move yet, so I plan to study and test that aspect of my final project more thoroughly.

What questions need to be resolved?

• Does Fab&Plant communicate the plants watering need well?
• How long does it take before Fab&Plant needs watering again?
• What is the maximum amount of water the system requires?

What will happen when?

I hope that by addressing these questions, Fab&Plant will meet all its objectives and become an efficient product.

what have you learned?

Throughout the completion of my final project, I have learned many things, ranging from electronics and programming—which I had never worked on before—to the complexities of manufacturing a product like Fab&Plant. I am very happy with everything I have learned.

Thanks to this week's assignment, I feel that my final project now has greater coherence in different aspects.

Links

• Fab Academy week 17 class

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