Thermometer
In this program, we use a temperature sensor to get the temperature and display it on a display.
Hardware¶
- Arch Board
- Grove - Temperature Sensor
- Grove - 4 Digit Display
Software¶
Import the following code to mbed online compiler
#include "mbed.h"
#include "DigitDisplay.h"
DigitDisplay display(P1_14, P1_13); // 4-Digit Display connected to UART Grove connector
AnalogIn thermistor(P0_12); // Thermistor output connected to P0_12
int main() {
unsigned int a;
unsigned int beta = 3975;
float temperature, resistance;
while(1) {
a = thermistor.read_u16(); /* Read analog value */
/* Calculate the resistance of the thermistor from analog votage read. */
resistance= (float) 10000.0 * ((65536.0 / a) - 1.0);
/* Convert the resistance to temperature using Steinhart's Hart equation */
temperature = (1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15;
display = (int)temperature;
wait(0.5);
}
}