Published August 23, 2023 © GPL3+

Virtual Pet

Wanting to recall one of the fondest memories of my childhood, I decided to implement an IoT version of a virtual pet.

IntermediateShowcase (no instructions)1 hour35

Things used in this project

Hardware components

Espressif Wemos D1 Mini

Temperature Sensor

Photo resistor

Resistor 220 ohm

LED, Blue

5 mm LED: Red

5 mm LED: Yellow

DFRobot Gravity:Digital Push Button (Yellow)

Software apps and online services

Blynk

Story

The virtual pet was one of the first technological advancements that became popular among children's games.

Intro

One of the most famous examples is the Tamagotchi, a small electronic egg with a screen on which one could choose and visualize a pet's life. However, early editions of these games did not represent an IoT system, and the latest updated edition does not include sensors or connections.

Wanting to recall one of the fondest memories of my childhood, I decided to implement an IoT version of a virtual pet.

This project, therefore, involves the material realization of a circuit using a WemosD1Mini board that uses the ESP8266 microchip capable of connecting to a WiFi network.

In addition, two types of sensors were used to allow the virtual pet to behave as truthfully as possible:

●The photoresistor allows the virtual pet's waking up and sleeping state to be reconciled with the natural day and night hours and to increase the feeling of hunger during waking,

●The temperature sensor allows the virtual pet to detect a temperature high enough to increase the feeling of thirst.

The central development concerns the possibility of controlling the virtual pet from a smartphone using the Blynk platform. This cloud platform allows virtual pins to connect to the board and control the virtual pet anywhere.

Code Diagram

Hardware

The photoresistor is a light sensor whose resistance varies inversely with light intensity: the conductivity increases by increasing light intensity.

DHT11 is a type of temperature sensor that measures the temperature and humidity of a particular room. Here, temperature only has been used.

OLED display communicates with the board through clock and data: the SDA pin allows the exchange of the data with the board, and the SCL pin exchanges "ping".

Software

Thanks to the WiFi connection integrated into the ESP8266, the board can connect to the Blynk server, which displays values through Virtual Pins.

The scope is to replicate the connection shown in the circuit diagram in a virtual space. The server makes use of ten virtual pins:

•V0 is connected to a gauge widget showing the life status

•V1 is connected to a button widget and writes the red button status

•V2 is connected to a gauge widget and reads the hungry percentage

•V3 is connected to a red LED that blinks if the pet is starving

•V4 is connected to a gauge widget that reads the thirsty percentage

•V5 is connected to a button widget and writes the blue button status

•V6 is connected to a blue LED that blinks according to the thirst status of the pet

•V7 is connected to a chart and a label widget and reads the luminosity through the photoresistor

•V8 is connected to a chart and a label widget and reads the Celsius degree through the temperature sensor

•V9 is connected to a yellow LED and reads the status of the pet according to the luminosity threshold

Dashboard Responsive view

Further Development

For this purpose, the time interval related to increasing or decreasing percentages is very short to allow the visualization of each feature in a short time range. However, developing the timing interval is strictly necessary for a real-life project to extend the pet's life during different days instead of seconds.

It will be interesting to extend the features by adding other details and characteristics, such as cleaning the pet according to some actions or increasing the pet's humour by playing games.

It could be possible to insert the Bluetooth connection option and the WiFi option to enlarge the battery power life.

Using different kinds of boards makes it possible to save power consumption and add some other status related to Heartbeat detection, like the pet's happiness with a Pulse sensor.

Code

Untitled file

#define BLYNK_TEMPLATE_ID           ""
#define BLYNK_DEVICE_NAME           ""
#define BLYNK_AUTH_TOKEN            ""
#define BLYNK_PRINT Serial
#define light A0
#define i2c_Address 0x3c //OLED i2c address
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1 //OLED hasn't got reset pin

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "";
char pass[] = "";

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DHT.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH110X.h>

#define DHTPIN 14 
#define DHTTYPE DHT11 
DHT dht(DHTPIN, DHTTYPE);

BlynkTimer timer;

float life = 100;
float hungry = 0;
float thirsty = 0;
int thresholdlight = 100;
int thresholdtemp = 20;
int foodbutton;
int waterbutton;
float timeBlink = random(800, 1500);
float timeDeblink = random(300, 500);
float degree; 
int luminosity;
Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //OLED display
WidgetLED red(V3);
WidgetLED blue(V6);
WidgetLED yellow(V9);

//DEFINING ARRAYS
//open eyes array
static const unsigned char PROGMEM image_data_OPENarray[] = { 
  // FIRST C-File Array
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};

//closed eyes array
static const unsigned char PROGMEM image_data_CLOSEDarray[] = { 
  // 21 ARRAY for EYES_SLEEP
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  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 
  0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 
  0x00, 0x00, 0x03, 0x80, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 
  0x00, 0x00, 0x01, 0xe0, 0x00, 0x00, 0xf8, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x01, 0xc0, 0x00, 0x00, 
  0x00, 0x00, 0x01, 0xfc, 0x00, 0x07, 0xf8, 0x00, 0x00, 0x0f, 0x80, 0x00, 0x07, 0xc0, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0xff, 0xf1, 0xff, 0xf0, 0x00, 0x00, 0x07, 0xf0, 0x00, 0x3f, 0x80, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x07, 0xff, 0xcf, 0xff, 0x80, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x01, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xf8, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x07, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xf0, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x03, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xe0, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0x80, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
};

//Stating what happen by changing the state of the red (food) button
BLYNK_WRITE(V1) 
{

  foodbutton = param.asInt();
  
  if (foodbutton == 1)
    hungry--;
  else if (foodbutton == 0)
    hungry = hungry + 0.2;

}

//Stating what happen by changing the state of the blue (water) button
BLYNK_WRITE(V5) 
{

  waterbutton = param.asInt(); 

  if (waterbutton == 1)
    thirsty--;
  else if (waterbutton == 0)
    thirsty = thirsty + 0.2;

}

//syncronizing button state with the last value registered by the server
BLYNK_CONNECTED() {

  Blynk.syncVirtual(V1);
  Blynk.syncVirtual(V5);
  
}

// Variables are updated once every second in the following way:
void updates() {

  degree = dht.readTemperature(); 
  luminosity = analogRead(light);
  life = 100 - (0.5*hungry + 0.5*thirsty);
  life = constrain(life, 0, 100); //this function allows me to define the life variable as a linear regression: decreasing hungry and thirsty, life increase.
                                                            //in addition, I forced the variable to assume values in range [0, 100]. 
  
  if (luminosity > thresholdlight && degree > thresholdtemp){
    if (waterbutton == 1)
      thirsty--;
    if (waterbutton == 0)
      thirsty = thirsty + 0.2;
  }

  if (luminosity > thresholdlight){
    if (foodbutton == 1)
      hungry--;
    if (foodbutton == 0)
      hungry = hungry + 0.2;
  }

  Blynk.virtualWrite(V0, life);
  Blynk.virtualWrite(V2, hungry);
  Blynk.virtualWrite(V4, thirsty);
  Blynk.virtualWrite(V7, luminosity);
  Blynk.virtualWrite(V8, degree);

}

//manage blinking blue and red led when thirsty and hungry are >= 70%
void manageBlinkingLeds() {

  if (luminosity > thresholdlight){ //yellow led is on when pet is awake, off when pet is sleeping
    yellow.on();
    openedEyes();
    closedEyes();}
  else if (luminosity < thresholdlight){
    yellow.off();
    closedEyes();}

  if (hungry > 70){ //if hungry state reach 70%, red led blink
    if (red.getValue()) {
      red.off();} 
    else {
      red.on();}}
  else if (hungry < 70) {
    red.off();
  }

  if (thirsty > 70){ //if thirsty reach 70%, blue led blink
    if (blue.getValue()) {
      blue.off();} 
    else {
      blue.on();}}
  else if (hungry < 70) {
    blue.off();
  }
  
}

void openedEyes() {

  if (luminosity > thresholdlight){
    display.clearDisplay();
    display.drawBitmap(0, 0, image_data_OPENarray, 128, 64, 1);
    display.display();
    display.clearDisplay();}

}

void closedEyes() {

  display.clearDisplay();
  display.drawBitmap(0, 0, image_data_CLOSEDarray, 128, 64, 1);
  display.display();
  display.clearDisplay();

}

void setup()
{

  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  dht.begin();
  display.begin(i2c_Address, true);
  display.clearDisplay();

  timer.setInterval(1000, updates);
  timer.setInterval(1000, manageBlinkingLeds);
  timer.setInterval(timeDeblink, openedEyes);
  timer.setInterval(timeBlink, closedEyes);

}

void loop()
{

  Blynk.run();
  timer.run();

}

Credits

Alessia Simone

1 project • 0 followers

Thanks to satheeshsankaran.

Virtual Pet

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Hardware components

Software apps and online services

Story

Intro

Hardware

Software

Further Development

Schematics

Schematics

circuit diagram

Code

Untitled file

Credits

Alessia Simone

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Virtual Pet

Virtual Pet

Things used in this project

Hardware components

Software apps and online services

Story

Intro

Hardware

Software

Further Development

Schematics

Schematics

circuit diagram

Code

Untitled file

Credits

Alessia Simone

Comments

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