Question

Show the tinkercad schematic diagram if possible.

Program in Arduino to do the following Display humidity, temperature, the amount of sunlight in the greenhouse in the serial monitor Turn the fan on low speed when temperature is between 25 °C and 30 °C. Turn the fan on medium speed when temperature is between 30 °C and 35 °C Turn the fan on high speed when temperature is over 35 °C. The fan remains turned off when temperature is below 25 °C. Display "Animal Detected in the command window when an object is closer than 30 cm from the imaginary) gate of the greenhouse. -

Answer 1

#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

int LightPin = A0; //data read pin of ldr
int light=0;        //light intensity
int tempPin = A1;   // the output pin of LM35
int fan = 11;       // led pin
int temp;   // the maximum temperature when fan is at 100%
int fanSpeed;
int lowSpeed=255/3;
int mediumSpeed=lowSpeed*2;

void setup() {
pinMode(LightPin , INPUT);
Serial.begin(9600);
pinMode(fan, OUTPUT);
pinMode(tempPin, INPUT);
dht.begin();
}

void loop() {
   temp = readTemp();     // get the temperature
   if(temp < 25) { // if temp is lower than minimum temp
      fanSpeed = 0; // fan is not spinning
      digitalWrite(fan, LOW);
   }
   if((temp >= 25) && (temp <= 30)) { // if temperature is higher than minimum temp
      fanSpeed = lowSpeed; // the actual speed of fan
      analogWrite(fan, fanSpeed); // spin the fan at the fanSpeed speed
   }
   if((temp >= 30) && (temp <= 35)) { // if temperature is higher than minimum temp
      fanSpeed = mediumSpeed; // the actual speed of fan
      analogWrite(fan, fanSpeed); // spin the fan at the fanSpeed speed
   }
   if(temp > 35) {        // if temp is higher than tempMax
      fanSpeed = 255; // the actual speed of fan
      analogWrite(fan, fanSpeed);
   }
   float h = dht.readHumidity(); // Reading temperature or humidity
   light=analogRead(LightPin);
   Serial.print("temperature = ");
   Serial.print(temp);
   Serial.print(", humidity = ");
   Serial.print(h);
   Serial.print("light intensity = ");
   Serial.println(light);
   delay(300);
}

int readTemp() { // get the temperature and convert it to celsius
temp = analogRead(tempPin);
return temp * 0.48828125;
}

note: inorder for this code to work you need to install some libraries . make sure you do that

for light measurement i used ldr only

for controlling of fan speed i changed the anlog write values

for temperature and humidity i used two different temperature and humidity sensors

sorry for not giving tinkercad schematic i am not fimiliar with that software/website.

hope this code will do the job.