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Dependencies: DigitDisplay mbed
Fork of Grove_Thermometer by
main.cpp
- Committer:
- djbottrill
- Date:
- 2014-10-04
- Revision:
- 0:e253fc5f8e16
- Child:
- 1:b4a3436b7cd0
File content as of revision 0:e253fc5f8e16:
/* Grove - Temprature Sensor demo v1.0
* This sensor detects the enviroment temprature,
* Uses a Arch-Pro board with Grove Base Shield
* Connect the Grove Temperature sensor to A0 and
* connect a Grove 4 digit LED display to the UART connector
* The temperature will be displayed in Celcius
* Modified by David Bottrill from the original Arduino code
* By: http://www.seeedstudio.com
*/
#include "mbed.h"
#include "DigitDisplay.h"
DigitalOut myled(LED1);
DigitDisplay display(P4_29, P4_28);
AnalogIn ain(P0_23);
int a;
float temperature;
int B=3975; //B value of the thermistor
float resistance;
int main()
{
while(1) {
// multiply ain by 675 if the Grove shield is set to 5V or 1023 if set to 3.3V
a=ain*675;
resistance=(float)(1023-a)*10000/a; //get the resistance of the sensor;
temperature=1/(log(resistance/10000)/B+1/298.15)-273.15; //convert to temperature via datasheet ;
myled = 1;
wait(0.5);
myled = 0;
wait(0.5);
display.write(temperature);
}
}
