TM1637 to display temperature. Code question

hi there,

i'm trying display temperature on tm1637 display. variable i'm trying display "steinhart". declared float when compile error reads:"steinhart' not declared in scope". alrighty then, declare , displays 0 on display.

my code kind of frankencode there might things not match. ordanized components.

what think i'm doing wrong? thank guidance.

code: [select]

#include <servo.h>
#include <tm1637display.h>

//---------servo------------

servo myservo;                // create servo object control servo
int potpin = 0;               // analog pin used connect potentiometer
int val;         


//-------thermistor---------

#define tpin a1                  // analog pin connect
#define tresistance 2500000      // resistance @ 25 degrees c
#define troom 25                 // temp. nominal resistance
#define nsamples 1               // how many samples take , average, more takes longer more 'smooth'
#define bcoeff 3980              // beta coefficient of thermistor
#define seriesresistor 100000    // value of 'other' resistor
int samples[nsamples];


//---------display-------------

const int clk = 3;                 //set clk pin connection display
const int dio = 2;                 //set dio pin connection display
tm1637display display(clk, dio);   //set 4-digit display.
 

void setup(void) {

  serial.begin(9600);
  myservo.attach(8);                // attaches servo on pin 9 servo object
  display.setbrightness(0x0a);      //set diplay maximum brightness
 }
 
void loop(void) {
  {uint8_t i;
  float average;
  (i=0; i< nsamples; i++) {      // take n samples in row, slight delay
   samples[i] = analogread(tpin);
   delay(10);
  }
  average = 0;
   for (i=0; i< nsamples; i++) {
     average += samples[i];
  }
  average /= nsamples;
  average = 1023 / average - 1;
  average = seriesresistor / average;
  float steinhart;
  steinhart = average / tresistance;           // (r/ro)
  steinhart = log(steinhart);                  // ln(r/ro)
  steinhart /= bcoeff;                         // 1/b * ln(r/ro)
  steinhart += 1.0 / (troom + 273.15);         // + (1/to)
  steinhart = 1.0 / steinhart;                 // invert
  steinhart -= 273.15;                         // convert c
  serial.print("temperature ");
  serial.print(steinhart);
  serial.println(" *c");
  //delay(1000);
 
 //--------servo knob----------------
 
 val = analogread(potpin);          // reads value of the
                                    // potentiometer (value between
                                    // 0 , 1023)
 val = map(val, 0, 1023, 0, 179);   // scale use with
                                    // servo (value between 0 and
                                    // 180)
 myservo.write(val);                // sets servo position according
                                    // scaled value
 delay(15);
 
  }

 //-----------display-- -------------
 //float steinhart;
 display.shownumberdec(steinhart);  //display variable value;
}
       

i see no reason store individual readings in array, can iterate on array , add values. add them read them.

code: [select]

  average /= nsamples;
what in average @ point?

code: [select]

  steinhart = average / tresistance;           // (r/ro)
what in steinhart @ point?

Arduino Forum > Using Arduino > Project Guidance > TM1637 to display temperature. Code question

arduino