【Intel Edison试用体验】Temperature Sensor温度显示

ti

`了解的模块是
实际上就是NTC热敏电阻
其原理图

数据手册相关资料

// Reads the value of the Grove - Temperature Sensor, converts it to a Celsius temperature,
// and prints it to the serial console.
// Connect the Grove - Temperature Sensor to the socket marked A0
// Open the Serial Monitor in the Arduino IDE after uploading
// Define the pin to which the temperature sensor is connected.
const int pinTemp = A0;
// Define the B-value of the thermistor.
// This value is a property of the thermistor used in the Grove - Temperature Sensor,
// and used to convert from the analog value it measures and a temperature value.
const int B = 4250;//3975;
//cutoff freq and time constant of the offset calibration LPF
#define WC_CAL 0.2
#define TC_CAL 1/WC_CAL
float T = 0.2; // Samping period (sec)
float cal_filt_gain = T/(T+TC_CAL);
float temperature_last = 25.0;
void setup()
{
// Configure the serial communication line at 9600 baud (bits per second.)
Serial.begin(9600);
}
void loop()
{
// Get the (raw) value of the temperature sensor.
int val = analogRead(pinTemp);
// Determine the current resistance of the thermistor based on the sensor value.
float resistance = (float)(1023-val)*100000/val;//串联电阻分压公式求出，注意，AD的参考电压等于串联电阻的总电压
// Calculate the temperature based on the resistance value.
float temperature_now = 1/(log(resistance/100000)/B+1/298.15)-273.15;
//1°K=°C+273.15 298.15K = 25
//LPF
float temperature = temperature_now - temperature_last;
temperature_last = temperature*cal_filt_gain+temperature_last;
Serial.print(temperature_now);
Serial.print(",");
// Print the temperature to the serial console.
Serial.println(temperature_last);
// Wait one second between measurements.
delay(500);
}