Trying to convert from Celsius to Fahrenheit but a error

Projects Programming
1

So to begin i have a small setup that involves a thermisitor, a bread board , a arduino uno, and a 19K resistor. The components all together read temps and i have reading out in Celsius but i want to convert it to Fahrenheit but i am unsure of where to perform the action, my native language is python so sorry if this is a really simple and dumb mistake :slightly_smiling_face: .

thermistor1.ino (536 Bytes)

2

You want to do them in loop().

3

i have it so it takes the reading of Celsius and converts it to Fahrenheit but it gives em a error of the f not declared in scope but yet i define it right above where it gets printed

4

Copy and paste your code here.

5

If this your code you DO NOT have F declared! Also, single character variables are frowned upon except for use as loop counters.

#define SERIESRESISTOR 19000    
#define THERMISTORPIN A0 

void setup(void) {
  Serial.begin(9600);
  
}
void loop(void) {
  float reading;
reading = analogRead(THERMISTORPIN);
F = (reading * 9/5) + 32;
  
  Serial.print("Analog reading "); 
  Serial.println(F);
 
  // convert the value to resistance
  reading = (1023 / reading)  - 1;     // (1023/ADC - 1) 
  reading = SERIESRESISTOR / reading;  // 19K / (1023/ADC - 1)
  Serial.print("Thermistor resistance "); 
  Serial.println(reading);
 
  delay(1000);
}

I bet this compiles:

#define SERIESRESISTOR 19000    
#define THERMISTORPIN A0 

void setup(void) {
  Serial.begin(9600);
  
}
void loop(void) {
  float cReading = analogRead(THERMISTORPIN);
  float fReading = (cReading * 9/5) + 32;
  
  Serial.print("Analog reading "); 
  Serial.println(fReading );
 
  // convert the value to resistance
  cReading = (1023 / cReading)  - 1;     // (1023/ADC - 1) 
  cReading = SERIESRESISTOR / cReading ;  // 19K / (1023/ADC - 1)
  Serial.print("Thermistor resistance "); 
  Serial.println(cReading);
 
  delay(1000);
}
6

but yet i define it right above where it gets printed

the misconception is partly cause by the compiler working it's way back from the end, commenting out//Serial.println(F); would give F not declared in this scope at lineF = (reading * 9/5) + 32;

7

Where did you get a 19K ohm resistor ??