Marko Heyns
Program to measure temperature array and send results to PC via serial.
Dependencies: NTCThermistor mbed
Revision 0:8a5d6b639e51, committed 2017-02-06
- Comitter:
- markoheyns
- Date:
- Mon Feb 06 22:22:26 2017 +0000
- Commit message:
- Conical Fermenter Temp Array Logger
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NTCThermistor.lib Mon Feb 06 22:22:26 2017 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/macht/code/NTCThermistor/#e9f38dc974f8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Feb 06 22:22:26 2017 +0000
@@ -0,0 +1,92 @@
+#include "mbed.h"
+
+#define THERMISTORNOMINAL 10000
+#define TEMPERATURENOMINAL 25
+#define BCOEFFICIENT 3435
+//#define SERIESRESISTOR 10000
+#define SERIESRESISTOR 10000
+#define TEMPRATE 0.2
+#define NUMSAMPLES 100
+
+AnalogIn thermistor1(A0);
+AnalogIn thermistor2(A1);
+AnalogIn thermistor3(A2);
+AnalogIn thermistor4(A3);
+AnalogIn thermistor5(A4);
+AnalogIn thermistor6(A5);
+AnalogIn thermistor7(D11);
+ Serial pc(SERIAL_TX, SERIAL_RX);
+DigitalOut led(LED1);
+float tempArray[7];
+unsigned int samples[NUMSAMPLES];
+
+void readProbeX(int probeNum) {
+ float resistance = 0;
+ float average;
+ int i;
+ for (i=0; i< NUMSAMPLES; i++) {
+ switch (probeNum){
+ case 0:
+ samples[i] = thermistor1.read_u16();
+ break;
+ case 1:
+ samples[i] = thermistor2.read_u16();
+ break;
+ case 2:
+ samples[i] = thermistor3.read_u16();
+ break;
+ case 3:
+ samples[i] = thermistor4.read_u16();
+ break;
+ case 4:
+ samples[i] = thermistor5.read_u16();
+ break;
+ case 5:
+ samples[i] = thermistor6.read_u16();
+ break;
+ case 6:
+ resistance = thermistor7.read_u16();
+ break;
+ default:
+ break;
+
+ }
+ wait(0.002);
+ }
+ // average all the samples out
+ average = 0;
+ for (i=0; i< NUMSAMPLES; i++) {
+ average += samples[i];
+ }
+ average /= NUMSAMPLES;
+ resistance = average;
+ resistance = (float) SERIESRESISTOR / ((65536 / resistance) - 1.0);
+ float steinhart;
+ steinhart = (log(resistance / THERMISTORNOMINAL))/BCOEFFICIENT + (1.0 / (TEMPERATURENOMINAL + 273.15));
+ steinhart = (1.0 / steinhart) - 273.15;
+ tempArray[probeNum] = steinhart;
+ //printf("read temp %d = %.1f C\n",probeNum, tempArray[probeNum]);
+ //wait(0.5);
+}
+void init(){
+
+}
+int main() {
+ //printf("\nFermenter Temp Array\n");
+ //pc.printf("Hello World !\n");
+ while(1) {
+ int x;
+ for (x = 0; x < 7; x++){
+ readProbeX(x);
+ }
+ for (x = 6; x >= 0; x--){
+ printf("Temp Probe %d = %.1f C\n",x, tempArray[x]);
+ }
+ //printf("%.1f,%.1f,%.1f,%.1f,%.1f,%.1f,%.1f\n", tempArray[0], tempArray[1], tempArray[2], tempArray[3], tempArray[4], tempArray[5], tempArray[6]);
+ pc.printf("\n");
+ wait(5.0);
+
+ }
+
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Feb 06 22:22:26 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/ad3be0349dc5 \ No newline at end of file