*And by correctly i mean it sends 6 bytes of emg data which seems wrong since it should be 2 bytes.
-Nick On Tue, May 15, 2012 at 1:21 PM, Nicholas Hosein <[email protected]>wrote: > Hi Jong, > > This is the C++ code that ive been using. It works for acc/gyr/mag. Now i > am testing it on emg: > > char arg0 = SET_SENSORS_COMMAND; > > char arg1 = (acc << 7)+(gyr << 6)+(mag << 5) > > +(ecg << 4)+(emg << 3)+(gsr << 2) > > +(ex7 << 1)+(ex0 << 0); > > char arg2 = 0; > > > socket->write(&arg0,1); > > socket->write(&arg1,1); > > socket->write(&arg2,1); > > > > > For the EMG Shimmer Mote when i have all sensors off except the emg (acc > disabled) I get the situation in my previous email with a packet size of 9 > bytes including header and timestamp. > > I do receive an ack from the shimmer mote after sending the command. When > i request to start the collection of data the data comes correctly at the > frequency i specify. > > Much Thanks, > > Nick > > On Tue, May 15, 2012 at 12:22 AM, Jong Chern Lim < > [email protected]> wrote: > >> Hi Nicholas,**** >> >> ** ** >> >> Could you explain a little more about what you mean by ‘sent the signal >> to enable the acc’? As an example using java (assuming you are using the >> standard serial protocol), the transmitted packet should look something >> like **** >> >> ** ** >> >> write(new byte[]{0x08, 0x08, 0x00}); **** >> >> ** ** >> >> If you refer to >> http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x-contrib/shimmer/apps/BoilerPlate/Shimmer.h?content-type=text%2Fplain, >> you will see that the first 0x08 is the packet type: Set_Sensors_Command >> and the second 0x08 is SENSOR_EMG. **** >> >> ** ** >> >> Were you able to receive an Ack packet after sending the set sensor >> command packet?**** >> >> ** ** >> >> Regards,**** >> >> JC**** >> ------------------------------ >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Nicholas Hosein >> *Sent:* 14 May 2012 23:16 >> *To:* [email protected] >> *Subject:* Re: [Shimmer-users] EMG Packet Question**** >> >> ** ** >> >> In addition the data doesnt seem to change with stimulus from the muscle. >> **** >> >> On Thu, May 10, 2012 at 2:09 PM, Nicholas Hosein <[email protected]> >> wrote:**** >> >> So i currently have acc/gyr/mag working and was adding emg support to my >> C++ program. I sent the signal to enable the acc/emg (bit3 = 1 ). I then >> receive 9 bytes from the shimmer = 1 header, 2 timestamp, 6 data.**** >> >> ** ** >> >> My question is why does the emg have 6 bytes of data? The accelerometer >> has x,y,z so 6 bytes makes sense but the emg is just one signal?**** >> >> ** ** >> >> Thanks,**** >> >> ** ** >> >> Nick**** >> >> ** ** >> > >
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