Serial Monitor communication

Using Arduino Project Guidance
1

I am trying to make a temperature and humidity monitor and I wrote this code so far, But for some reason, even if I send a correct letter into the serial monitor, it doesn't do anything. Here is my code:

#include <dht.h>
#define dht11 A0
dht DHT;
int redPin= 9;// Red Color to pin 3 on the Arduino
int greenPin = 8;//Green Color to pin 5 on the Arduino
int bluePin = 7;
int buzzPin = 11;
char data;
float temp;
float humi;
void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(buzzPin, OUTPUT);
  setColor(225, 0, 0);
  Serial.begin(9200);
  Serial.println("Portable temp measuring unit");
  delay(100);
  Serial.println("Enter t for temp. Enter h for humidity.");
  Serial.println("Accesing sensor");
  delay(100);
  Serial.print(".");
  delay(1000);
  Serial.print(".");
  delay(1000);
  Serial.print(".");
  delay(100);
  analogWrite(buzzPin, 100);
  delay(250);
  analogWrite(buzzPin, 0);
  delay(250);
  analogWrite(buzzPin, 300);
  delay(250);
  analogWrite(buzzPin, 0);
  setColor(0, 255, 0);
  Serial.flush();
}
void loop(){
  DHT.read11(dht11);
  temp = DHT.temperature;
  humi = DHT.humidity; 
  if(Serial.available()>0){
      data = Serial.read();
  }  
  Temperature();
  Humidity();
  delay(3000);

}




void setColor(int redValue, int greenValue, int blueValue) {
analogWrite(redPin, redValue);
analogWrite(greenPin, greenValue);
analogWrite(bluePin, blueValue);
}
void Temperature(){
  
    if(data == "t"){
      analogWrite(buzzPin, 300);
      delay(250);
      analogWrite(buzzPin, 0);
      Serial.println("Temperature:");
      Serial.println(temp);
      Serial.print("*c");
      Serial.println(temp*1.8+32);
      Serial.print("*F");
    }
}
void Humidity(){
  if(data == "h"){
      analogWrite(buzzPin, 300);
      delay(250);
      analogWrite(buzzPin, 0);
      Serial.println("Humidity:");
      Serial.print(humi);
    }
}
2

This is an odd baudrate..... 9600 is a standard but I use 115200 and it works well.

3

Not the issue, but it’s an odd design to call each function(), then parse for the desired ‘letter’.

Most would o the parsing in loop(), or a dedicated command parser function.

To each his own.

4

Ehh?

My reading was that Serial.print does not work. Setup to 9200 would cut off Serial Monitor.

5

Oops

6

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