Diff: main.cpp

Revision:

0:818d3faeb71f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Feb 13 20:53:18 2017 +0000
@@ -0,0 +1,35 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+AnalogIn ain(PB_0);
+Serial pc(USBTX, USBRX); // tx, rx
+  
+double resistinput;
+double bridgeR1=218.14;
+double bridgeR2=218.96;
+double bridgeR3=218.46;
+double gainR12=20000;
+double gainR34=46200;
+double bridgePotential;
+double sourceVoltage=5.0;
+double strainResist;
+double wheatstonePotential;
+double dynamicRangePotential;
+
+int main() {
+    
+    dynamicRangePotential=sourceVoltage*(bridgeR3/(bridgeR3+bridgeR2));
+    
+    
+    while(1) {
+        
+        resistinput=ain.read();
+        wheatstonePotential=sourceVoltage*resistinput*gainR12/gainR34;
+        bridgePotential=wheatstonePotential+dynamicRangePotential;
+        strainResist=-bridgeR1*bridgePotential/(bridgePotential-sourceVoltage);
+        
+        pc.printf("Resistance= %f \n", strainResist);
+        wait(1);
+        }
+}
+