0-5V signal from NTC (Solved)

Hi, i am completly new at this and therefore i wonder if you could help me with my first project.

i want to make a temperature compansated charger.

so i figured if i made a circut like this:http://playground.arduino.cc/ComponentLib/Thermistor

i could for example say at 0C digital pin 8 0V and at 20C digital pin 8 5V

tanks in advance.

Best regards!

Yes, you can do something like this

//Thermistor

// http://playground.arduino.cc/ComponentLib/Thermistor

#include <avr/pgmspace.h>

int led_state;
unsigned long time;

#define THERM_PIN   0  // 10ktherm & 10k resistor as divider connected to analog input A0.

//Thermistor lookup Table
//
// Small Version
/*
ADC   C
250,  1.4
275,  4.0
300,  6.4
325,  8.8
350,  11.1
375,  13.4
400,  15.6
425,  17.8
450,  20.0
475,  22.2
500,  24.4
525,  26.7
550,  29.0
575,  31.3
600,  33.7
625,  36.1
650,  38.7
675,  41.3
700,  44.1
725,  47.1
750,  50.2
775,  53.7
784,  55.0
825,  61.5
850,  66.2
875,  71.5
900,  77.9
925,  85.7
937,  90.3
950,  96.0
975,  111.2
1000, 139.5
*/

// Big lookup Table (approx 750 entries), subtract 238 from ADC reading to start at 0*C. Entries in 10ths of degree i.e. 242 = 24.2*C Covers 0*C to 150*C For 10k resistor/10k thermistor voltage divider w/ therm on the + side.
const int temps[] PROGMEM = { 0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 143, 144, 145, 146, 147, 148, 149, 150, 151, 151, 152, 153, 154, 155, 156, 157, 158, 159, 159, 160, 161, 162, 163, 164, 165, 166, 167, 167, 168, 169, 170, 171, 172, 173, 174, 175, 175, 176, 177, 178, 179, 180, 181, 182, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 193, 194, 195, 196, 197, 197, 198, 199, 200, 201, 202, 203, 204, 205, 205, 206, 207, 208, 209, 210, 211, 212, 212, 213, 214, 215, 216, 217, 218, 219, 220, 220, 221, 222, 223, 224, 225, 226, 227, 228, 228, 229, 230, 231, 232, 233, 234, 235, 235, 236, 237, 238, 239, 240, 241, 242, 243, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255, 256, 257, 258, 259, 260, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 422, 423, 424, 425, 426, 427, 428, 429, 430, 432, 433, 434, 435, 436, 437, 438, 439, 441, 442, 443, 444, 445, 446, 448, 449, 450, 451, 452, 453, 455, 456, 457, 458, 459, 460, 462, 463, 464, 465, 466, 468, 469, 470, 471, 472, 474, 475, 476, 477, 479, 480, 481, 482, 484, 485, 486, 487, 489, 490, 491, 492, 494, 495, 496, 498, 499, 500, 501, 503, 504, 505, 507, 508, 509, 511, 512, 513, 515, 516, 517, 519, 520, 521, 523, 524, 525, 527, 528, 530, 531, 532, 534, 535, 537, 538, 539, 541, 542, 544, 545, 547, 548, 550, 551, 552, 554, 555, 557, 558, 560, 561, 563, 564, 566, 567, 569, 570, 572, 574, 575, 577, 578, 580, 581, 583, 585, 586, 588, 589, 591, 593, 594, 596, 598, 599, 601, 603, 604, 606, 608, 609, 611, 613, 614, 616, 618, 620, 621, 623, 625, 627, 628, 630, 632, 634, 636, 638, 639, 641, 643, 645, 647, 649, 651, 653, 654, 656, 658, 660, 662, 664, 666, 668, 670, 672, 674, 676, 678, 680, 683, 685, 687, 689, 691, 693, 695, 697, 700, 702, 704, 706, 708, 711, 713, 715, 718, 720, 722, 725, 727, 729, 732, 734, 737, 739, 741, 744, 746, 749, 752, 754, 757, 759, 762, 764, 767, 770, 773, 775, 778, 781, 784, 786, 789, 792, 795, 798, 801, 804, 807, 810, 813, 816, 819, 822, 825, 829, 832, 835, 838, 842, 845, 848, 852, 855, 859, 862, 866, 869, 873, 877, 881, 884, 888, 892, 896, 900, 904, 908, 912, 916, 920, 925, 929, 933, 938, 942, 947, 952, 956, 961, 966, 971, 976, 981, 986, 991, 997, 1002, 1007, 1013, 1019, 1024, 1030, 1036, 1042, 1049, 1055, 1061, 1068, 1075, 1082, 1088, 1096, 1103, 1110, 1118, 1126, 1134, 1142, 1150, 1159, 1168, 1177, 1186, 1196, 1206, 1216, 1226, 1237, 1248, 1260, 1272, 1284, 1297, 1310, 1324, 1338, 1353, 1369, 1385, 1402, 1420, 1439, 1459, 1480, 1502 };


void setup() 
{
	pinMode(13, OUTPUT);  // LED
	pinMode(8, OUTPUT);   // Output control
	Serial.begin(19200);
	time=millis();
	Serial.println("Ready");

}

void loop() 
{ 
	int therm;   
	therm=analogRead(THERM_PIN)-238;
	therm=pgm_read_word(&temps[therm]);

	Serial.println(therm, DEC);

	if(therm <= 0 ) digitalWrite(8, LOW);   // at 0C digital pin 8 0V and 
	if(therm >= 20) digitalWrite(8, HIGH);  //at 20C digital pin 8 5V
	
	if (millis() - time >1000){   
		time=millis();
		digitalWrite(13,led_state);
		led_state=!led_state;
	}
}

Thanks a lot:) i think i may have explained wrong.

i need a variable voltage from 0V to 5V

for example: -0C = 0V +20C = 5V
then 10C will be 2.5V

this is the code i have to this point.
Digital pin 10 switches on at more than 26C

// which analog pin to connect
#define THERMISTORPIN A0
// resistance at 25 degrees C
#define THERMISTORNOMINAL 10000
// temp. for nominal resistance (almost always 25 C)
#define TEMPERATURENOMINAL 25
// how many samples to take and average, more takes longer
// but is more ‘smooth’
#define NUMSAMPLES 5
// The beta coefficient of the thermistor (usually 3000-4000)
#define BCOEFFICIENT 3950
// the value of the ‘other’ resistor
#define SERIESRESISTOR 10000

int samples[NUMSAMPLES];

int pinOut = 10;

void setup(void) {
Serial.begin(9600);
analogReference(EXTERNAL);
pinMode(10, OUTPUT);
}

void loop(void) {
uint8_t i;
float average;

// take N samples in a row, with a slight delay
for (i=0; i< NUMSAMPLES; i++) {
samples = analogRead(THERMISTORPIN);

  • delay(10);*

  • }*

  • // average all the samples out*

  • average = 0;*

  • for (i=0; i< NUMSAMPLES; i++) {*
    _ average += samples*;_
    _
    }_
    _
    average /= NUMSAMPLES;*_

* Serial.print("Average analog reading ");*
* Serial.println(average);*

* // convert the value to resistance*
* average = 1023 / average - 1;*
* average = SERIESRESISTOR / average;*
* Serial.print("Thermistor resistance ");*
* Serial.println(average);*

* float steinhart;*
* steinhart = average / THERMISTORNOMINAL; // (R/Ro)*
* steinhart = log(steinhart); // ln(R/Ro)*
_ steinhart /= BCOEFFICIENT; // 1/B * ln(R/Ro)_
* steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)*
* steinhart = 1.0 / steinhart; // Invert*
* steinhart -= 273.15; // convert to C*

* Serial.print("Temperature ");*
* Serial.print(steinhart);*
_ Serial.println(" *C");_

* delay(1000);*

* if (steinhart <= 26){*
* digitalWrite(10, LOW);*
* }*
* else {*
* digitalWrite(10, HIGH);*
* }*
* delay(500); *
}

i have an update for my project.

at 0C or below i want 0V
at 20C or more i want 5V

from 0-20C i want 0-5V linear voltage.

this is a part from my code with a good start.
any suggestions?

if(steinhart <= 0) analogWrite(10, 0);
if(steinhart >= 0) analogWrite(10, 233);

No one knows a solution? i think i will be blocked from google any time now

Hi,
Can you please post a copy of your sketch, using code tags?
They are made with the </> icon in the reply Menu.
See section 7 http://forum.arduino.cc/index.php/topic,148850.0.html

What model arduino are you using, if its a UNO analogWrite does not output analog voltage, it is a PWM signal, 0 to 255 is 0 to 100% duty cycle.

Tom… :slight_smile:

Thanks for a fast reply Tom,

a PWM is good enough for me, a multimeter measure it as voltage.

here is a copy paste of my code.

// which analog pin to connect
#define THERMISTORPIN A0         
// resistance at 25 degrees C
#define THERMISTORNOMINAL 10000      
// temp. for nominal resistance (almost always 25 C)
#define TEMPERATURENOMINAL 25   
// how many samples to take and average, more takes longer
// but is more 'smooth'
#define NUMSAMPLES 5
// The beta coefficient of the thermistor (usually 3000-4000)
#define BCOEFFICIENT 3950
// the value of the 'other' resistor
#define SERIESRESISTOR 10000    
 
int samples[NUMSAMPLES];

int pinOut = 10;

void setup(void) {
  Serial.begin(9600);
  analogReference(EXTERNAL);
  pinMode(10, OUTPUT);
}
 
void loop(void) {
  uint8_t i;
  float average;
 
  // take N samples in a row, with a slight delay
  for (i=0; i< NUMSAMPLES; i++) {
   samples[i] = analogRead(THERMISTORPIN);
   delay(10);
  }
 
  // average all the samples out
  average = 0;
  for (i=0; i< NUMSAMPLES; i++) {
     average += samples[i];
  }
  average /= NUMSAMPLES;
 
  Serial.print("Average analog reading "); 
  Serial.println(average);
 
  // convert the value to resistance
  average = 1023 / average - 1;
  average = SERIESRESISTOR / average;
  Serial.print("Thermistor resistance "); 
  Serial.println(average);
 
  float steinhart;
  steinhart = average / THERMISTORNOMINAL;     // (R/Ro)
  steinhart = log(steinhart);                  // ln(R/Ro)
  steinhart /= BCOEFFICIENT;                   // 1/B * ln(R/Ro)
  steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
  steinhart = 1.0 / steinhart;                 // Invert
  steinhart -= 273.15;                         // convert to C
 
  Serial.print("Temperature "); 
  Serial.print(steinhart);
  Serial.println(" *C");
 
  delay(1000);
  
   
if(steinhart <= 0) analogWrite(10, 0);
  if(steinhart >= 0) analogWrite(10, 255);

  
  else {
    analogWrite(10, 0);
  }
  delay(500);  
}

Problem solved!

code as following

if(steinhart <= 0) {
  analogWrite(10, 0);
   }

else if(steinhart >= 20) { 
  analogWrite(10, 255);
 
  }

 
else {
  analogWrite(10, steinhart*255/20);
  }
  }