Vicente Ferrara
Implementación de un MUX para seleccionar diferentes termistores y obtener sus valores analogos y después realizar calculos para obtener la temperatura.
Revision 0:b1b7cdf4b288, committed 2017-03-31
- Comitter:
- VicenteFerrara
- Date:
- Fri Mar 31 04:10:27 2017 +0000
- Commit message:
- hecho;
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r b1b7cdf4b288 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Mar 31 04:10:27 2017 +0000
@@ -0,0 +1,144 @@
+#include "mbed.h"
+
+#define THERMISTORNOMINAL 100
+#define TEMPERATURENOMINAL 25
+#define NUMSAMPLES 10
+#define BCOEFFICIENT 3960
+#define SERIESRESISTOR 10000
+
+Serial pc(USBTX, USBRX);
+
+DigitalOut control1(D3);
+DigitalOut control2(D4);
+DigitalOut control3(D5);
+DigitalOut control4(D6);
+DigitalOut control5(D7);
+AnalogIn thermistor(A0);
+
+
+int samples[NUMSAMPLES];
+
+double sensorReadings[32];
+
+
+void procesamientoDatos(int count){
+uint8_t i;
+float average;
+for (; count < 8; count++){
+ for(i = 0; i < NUMSAMPLES; i++){
+ samples[i] = thermistor.read();
+ wait(0.1);
+ }
+ // average all the samples out
+ average = 0;
+ for (i=0; i< NUMSAMPLES; i++) {
+ average += samples[i];
+ }
+ average /= NUMSAMPLES;
+
+ pc.printf("Average analog reading = %f\r\n", average);
+
+ // convert the value to resistance
+ average = 1023 / average - 1;
+ average = SERIESRESISTOR / average;
+ pc.printf("Thermistor resistance = %f\r\n", 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
+
+ pc.printf("Temperature = %f\r\n", steinhart);
+
+ sensorReadings[count] = steinhart;
+ wait(0.1);
+ }
+
+ for (count=0; count<8; count++) {
+ pc.printf("Sensor #%f\r", count);
+ pc.printf(": %f\r\n", sensorReadings[count]);
+ }
+ wait(0.1);
+
+}
+
+
+
+
+int main()
+{
+ for(int iX = 0; iX < 8; iX++){
+ switch(iX){
+
+ case 0:
+ control1 = 0;
+ control2 = 0;
+ control3 = 0;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 1:
+ control1 = 1;
+ control2 = 0;
+ control3 = 0;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 2:
+ control1 = 0;
+ control2 = 1;
+ control3 = 0;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 3:
+ control1 = 1;
+ control2 = 1;
+ control3 = 0;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 4:
+ control1 = 0;
+ control2 = 0;
+ control3 = 1;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 5:
+ control1 = 1;
+ control2 = 0;
+ control3 = 1;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 6:
+ control1 = 0;
+ control2 = 1;
+ control3 = 1;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+ case 7:
+ control1 = 1;
+ control2 = 1;
+ control3 = 1;
+ control4 = 0;
+ control5 = 0;
+ procesamientoDatos(iX);
+ break;
+
+ }
+ }
+
+}
\ No newline at end of file
diff -r 000000000000 -r b1b7cdf4b288 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Mar 31 04:10:27 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/176b8275d35d \ No newline at end of file