How to read a String value and toggle an output based on said value.

Projects Programming
1

Hello all.

I have a 433 MHz ASK-based receiver that uses the RadioHead library that receives telemetry from a DHT-11 sensor and I'm trying to get an LED to turn/off at at a given arbitrary value. (When it gets cold outside)

I'm a noob but I'm using friggin' code tags.

/*
  433 MHz RF Module Receiver Demonstration 2
  RF-Rcv-Demo-2.ino
  Demonstrates 433 MHz RF Receiver Module with DHT-22 Sensor
  Use with Transmitter Demonstration 2
 
  DroneBot Workshop 2018
  https://dronebotworkshop.com
*/
 
// Include RadioHead Amplitude Shift Keying Library
#include <RH_ASK.h>
// Include dependant SPI Library 
#include <SPI.h>

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define LED_PERFECT 2 // LED output Pin 2

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
 
// Define output strings
 
String str_humid;
String str_temp;
String str_out;
 
// Create Amplitude Shift Keying Object
RH_ASK rf_driver;
 
void setup()
{
    // Initialize ASK Object
    rf_driver.init();
    // Setup Serial Monitor
    Serial.begin(9600);

      // initialize the LCD
  lcd.begin();

  // Turn on the blacklight and print a message.
  lcd.backlight();

  // use Arduino pins
  pinMode(2, OUTPUT);// set pin 2 as output
  
}
 
void loop()
{



  delay(100); // needed?




    // Set buffer to size of expected message
    uint8_t buf[11];
    uint8_t buflen = sizeof(buf);
    // Check if received packet is correct size
    if (rf_driver.recv(buf, &buflen))
    {
      
      // Message received with valid checksum
      // Get values from string
      
      // Convert received data into string
      str_out = String((char*)buf);

      
      // Split string into two values
      for (int i = 0; i < str_out.length(); i++) {
      if (str_out.substring(i, i+1) == ",") {
      str_humid = str_out.substring(0, i);
      str_temp = str_out.substring(i+1);
      break;
      }
    }
      
      // Print values to Serial Monitor

      Serial.print("Humidity: ");
      Serial.print(str_humid);
      Serial.print("  - Temperature: ");
      Serial.println(str_temp);


      // Print values to LCD
      lcd.setCursor(3,0);
      lcd.print("Humidity: ");
      lcd.print(str_humid);
      lcd.setCursor(1,1);      
      lcd.print("Temperature: ");
      lcd.print(str_temp);

   // if temperature goes below 80, turn the LED OFF
   if(str_temp.read)() < 80.0 ){
    digitalWrite(2, LOW);// set pin 10 LOW
   }else{
    digitalWrite(2, HIGH);// set pin 10 HIGH
   }

               
    }

       delay(1000);
}

Feel free to tell me what I'm doing wrong.

I'm a noob, that's why I'm here.