Electrodes l Leads - Inputs

Started by Samuele Greggio, January 17, 2016, 02:50:04 pm

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Samuele Greggio

I'm developing an appliction to read EKG signal.
What is the corrispondence between electrodes (white, red,  black) , leads (DI, DII, DIII), and analog input to  read?
Thank you,



EEG-SMT samples the analog signals and builds a 17-byte packet which is transmitted at 256Hz, using 1 start bit, 8 data bits, 1 stop bit, no parity, 57600 bits per second. Minimial transmission speed is 256Hz * sizeof(modeeg_packet) * 10 = 43520 bps.

EEG-SMT is based on the OpenEEG project. We used their data format which is defined in the so-called "firmware 2" of OpenEEG. The format is showed at this link (the modeeg_packet structure might be found in the beginning):


I recommend you to also inspect the firmware sources we have shared here: https://www.olimex.com/Products/EEG/OpenEEG/EEG-SMT/resources/EEG-SMT_firmware.zip

Check the screenshot below which I took yesterday - it shows a proper raw stream of data coming from EEG-SMT.

I used this terminal program: http://www.der-hammer.info/terminal/

The required settings are visible in screenshot (most importantly the baud rate should be 57 600 and the data should be set to hex).

Best regards,
Technical support and documentation manager at Olimex