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(SE017)Digital Temperature Sensor
1．Introduction
This module has both analog signal output pin and digital signal output pin, which
is different from analog temperature sensor(module33) and other temperature sensor
module. A thermistor is a type of resistor whose resistance is dependent on
temperature, more so than in standard resistors. The word is a portmanteau of
thermal and resistor. Thermistors are widely used as inrush current limiter,
temperature sensors (NTC type typically), self-resetting overcurrent protectors, and
self-regulating heating elements.
The Module’s feature as below:
Feature
Value
Model No.
NTC-MF52 3950
Temperature Range
-55℃~+125℃
Accuracy
+/- 0.5℃
2.Pinout
Pin
Description
A0
Analog signal output pin
D0
Digital signal output pin
G
Gnd
“+”
Vcc(reference voltage:5V DC)
Temperature convert Formula
Here we use Steinhart–Hart equation to calculate the corresponding temperature.
The equation is
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where:
T is the temperature (in Kelvins)
R is the resistance at T (in ohms)
A, B, and C are the Steinhart–Hart coefficients which vary depending on the type
and model of thermistor and the temperature range of interest. (The most general
form of the applied equation contains a [ln(R)]^2 term, but this is frequently
neglected because it is typically much smaller than the other coefficients).
Note: For this module, the recommended coefficients of A,B,C are
A equals 0.001129148;
B equals 0.000234125;
C equals 0.0000000876741;
More, the same item products has a little bit different A,B,C coefficients , which
depends your environmental temperature. If the recommended coefficients are
not accurate enough, you’d better amend the A,B,C coefficients by Thermistor
Calculator tool.
3 Example
This is a simple code for the NTC thermistor module, Connection as below:
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Example code :
******Code begin******
#include <math.h>
double Thermister(int RawADC) {
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))*
Temp );
Temp = Temp - 273.15;
return Temp;
}
void setup() {
Serial.begin(9600);
}
void loop()
{ Serial.print(Thermister(analogRead(0)));
Serial.println("c");
delay(1000); }
******Code End******
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