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  • Author Author: Former Member
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Arduino beginner

Former Member

I'm a complete beginner when it comes to electronics and programming, so I decided to help educate myself I would buy an Arduino starter kit. This kit arrived yesterday and came with an Arduino Project book which is jam packed with information and tutorials (great for learning and inspiration!!).

 

So far I have read the first few pages of the book and followed along with the first few examples. It's a lot of fun but I'm concerned about the mathematical aspect of electronics and programming (I skipped a few chapters to see what i would be doing and saw a few daunting parts that i could not get my head around). If any one has any advice for the Mathematical side I would be glad to hear from you in the comments section (i did not do very well at maths in school image but I don't want to give up) 

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  • Erny,

     

    Can you post the code or a link to it.  It's hard to figure out what you need without seeing the code you're working with.

     

    Kevin H.

  • in reply to kjhart0133 

    const int sensorPin = A0;
const float baselineTemp = 20.0;

void setup(){
  Serial.begin(9600);
  for(int pinNumber = 2; pinNumber < 5; pinNumber++){
    pinMode(pinNumber, OUTPUT);
    digitalWrite(pinNumber, LOW);
  }
}

void loop(){
  int sensorVal = analogRead(sensorPin);
  Serial.print("Sensor value: ");
  Serial.print(sensorVal);
  float voltage = (sensorVal/1024.0) * 5.0;
  Serial.print(", Volts: ");
  Serial.print(voltage);
  float temperature = (voltage - .5) * 100;
  Serial.print(", degrees C: ");
  Serial.println(temperature);
  
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);

  if(temperature >= baselineTemp + 2){
    digitalWrite(2, HIGH);
  }
  if(temperature >= baselineTemp + 4){
    digitalWrite(3, HIGH);
  }
  if(temperature >= baselineTemp + 6){
    digitalWrite(4, HIGH);
  }
  
  delay(1);
  
}

     

    that's the code and I don't understand these parts:  float voltage = (sensorVal/1024.0) * 5.0;  float temperature = (voltage - .5) * 100;

      i mean i know what they are there to do but i don't quite understand the maths (i hope i make sense)

Comment
  • in reply to kjhart0133 

    const int sensorPin = A0;
const float baselineTemp = 20.0;

void setup(){
  Serial.begin(9600);
  for(int pinNumber = 2; pinNumber < 5; pinNumber++){
    pinMode(pinNumber, OUTPUT);
    digitalWrite(pinNumber, LOW);
  }
}

void loop(){
  int sensorVal = analogRead(sensorPin);
  Serial.print("Sensor value: ");
  Serial.print(sensorVal);
  float voltage = (sensorVal/1024.0) * 5.0;
  Serial.print(", Volts: ");
  Serial.print(voltage);
  float temperature = (voltage - .5) * 100;
  Serial.print(", degrees C: ");
  Serial.println(temperature);
  
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);

  if(temperature >= baselineTemp + 2){
    digitalWrite(2, HIGH);
  }
  if(temperature >= baselineTemp + 4){
    digitalWrite(3, HIGH);
  }
  if(temperature >= baselineTemp + 6){
    digitalWrite(4, HIGH);
  }
  
  delay(1);
  
}

     

    that's the code and I don't understand these parts:  float voltage = (sensorVal/1024.0) * 5.0;  float temperature = (voltage - .5) * 100;

      i mean i know what they are there to do but i don't quite understand the maths (i hope i make sense)

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