Matthew Maat / Mbed 2 deprecated EMG-RMS

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Dependencies:   mbed HIDScope

Files at this revision

API Documentation at this revision

Revision 21:4183ea24a735, committed 2019-10-11

Comitter:
MatthewMaat
Date:
Fri Oct 11 11:59:59 2019 +0000
Parent:
20:97059009a491
Commit message:
RMS output van de EMG

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 
--- a/main.cpp	Thu Sep 22 08:53:50 2016 +0000
+++ b/main.cpp	Fri Oct 11 11:59:59 2019 +0000
@@ -1,5 +1,6 @@
 #include "mbed.h"
 #include "HIDScope.h"
+#include <math.h>
 
 //Define objects
 AnalogIn    emg0( A0 );
@@ -14,9 +15,23 @@
  **/
 void sample()
 {
+    static int count=0;
+    static float RMS_value=0;
+    static float HighPass_value=0;
+    count+=1;
+    static float RMS[150];
+    static float HighPass[30];
+    float I1;
+    float If;
+    I1=emg0.read(); //read signal
+    HighPass_value+=(I1-HighPass[count%30])/30.0;
+    HighPass[count%30]=I1;
+    If=pow(I1-HighPass_value,2.0f); // Highpass-filtered value squared
+    RMS_value+=(If-RMS[count%150])/150.0;
+    RMS[count%150]=If;
     /* Set the sampled emg values in channel 0 (the first channel) and 1 (the second channel) in the 'HIDScope' instance named 'scope' */
-    scope.set(0, emg0.read() );
-    scope.set(1, emg1.read() );
+    scope.set(0, sqrt(RMS_value) ); // send root mean squared
+    scope.set(1, emg0.read() );
     /* Repeat the step above if required for more channels of required (channel 0 up to 5 = 6 channels) 
     *  Ensure that enough channels are available (HIDScope scope( 2 ))
     *  Finally, send all channels to the PC at once */

--- a/mbed.bld	Thu Sep 22 08:53:50 2016 +0000
+++ b/mbed.bld	Fri Oct 11 11:59:59 2019 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/abea610beb85
\ No newline at end of file
+https://os.mbed.com/users/mbed_official/code/mbed/builds/aae6fcc7d9bb
\ No newline at end of file