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Dependencies: HIDScope MODSERIAL QEI biquadFilter mbed
Fork of
EMG_converter_code
by 
K K
Revision 0:1883d922ada8, committed 2015-10-21
- Comitter:
- Technical_Muffin
- Date:
- Wed Oct 21 15:23:36 2015 +0000
- Child:
- 1:9913e3886643
- Commit message:
- Code for converting emg signal to usable code.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HIDScope.lib Wed Oct 21 15:23:36 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/tomlankhorst/code/HIDScope/#5020a2c0934b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/biquadFilter.lib Wed Oct 21 15:23:36 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/tomlankhorst/code/biquadFilter/#e3bf917ae0a3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Oct 21 15:23:36 2015 +0000
@@ -0,0 +1,43 @@
+#include "mbed.h"
+#include "HIDScope.h"
+#include "biquadFilter.h" // Require the HIDScope library
+
+//Define objects
+AnalogIn emg(A0); //Analog of EMG input
+Ticker sample_timer;
+HIDScope scope(2); // Instantize a 2-channel HIDScope object
+/*The biquad filters required to transform the EMG signal into an usable signal*/
+biquadFilter filterhigh1(-1.1430, 0.4128, 0.6389, -1.2779, 0.6389);
+biquadFilter filterlow1(1.9556, 0.9565, 0.9780, 1.9561, 0.9780);
+biquadFilter notch(-1.1978e-16, 0.9561, 0.9780, -1.1978e-16, 0.9780);
+biquadFilter filterlow2(-1.9645, 0.9651, 1.5515e-4, 3.1030e-4, 1.5515e-4);
+
+/*
+ */
+void filter()
+{
+ /* Sample the EMG using the 'read' method of the 'AnalogIn' variable named 'emg' */
+ double emg_value = emg.read();
+ double signalpart1 = filterhigh1.step(emg_value);//Highpass filter for removing offset and artifacts
+ double signalpart2 = abs(signalpart1);//rectify the filtered signal
+ double signalpart3 = filterlow1.step(signalpart2);//low pass filter to envelope the emg
+ double signalpart4 = notch.step(signalpart3);//notch filter to remove 50Hz signal
+ double signalfinal = filterlow2.step(signalpart4);//2nd low pass filter to envelope the emg
+ scope.set(0,emg_value);//emg_value
+ scope.set(1,signalfinal);
+ /* Second, set the sampled emg value in channel zero (the first channel) in the 'HIDScope' variable named 'scope' */
+ /* Repeat the step above if required for more channels (channel 0 up to 5 = 6 channels) */
+ /* Finally, send all channels to the PC at once */
+ scope.send();
+}
+
+int main()
+{
+ /**Attach the 'sample' function to the timer 'sample_timer'.
+ * this ensures that 'sample' is executed every... 0.002 seconds
+ */
+ sample_timer.attach(&filter, 0.002);
+
+ /*empty loop, sample() is executed periodically*/
+ while(1) {}
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Oct 21 15:23:36 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/34e6b704fe68 \ No newline at end of file