gougouqd / ecg-1

Electrocardiography

ECG

An electrocardiograph prototype for the Remote Neonatal Monitoring and Intervention Project.

Dependencies

• Python 2.7
• Arduino >= 1.5.6-r2 (for Arduino Due)
• stream-plot (source included, but streamplot's dependencies need to be met) - https://github.com/s-gv/stream-plot
• MATLAB / Octave if you want to run simulations
• TI SmartRF Flash Programmer
• IAR 8051 >= 8.30 (only if you want to re-compile the source code for CC2540)
• TI CCDebugger (for programming CC2540)

How-to-use

Wired ECG with Arduino:

• Build the circuit in schematics/ecg_arduino.png. A USB to UART converter such as FT232 or CP2102 may be used.
• Program the Arduino with the source in ecg_arduino/ecg_arduino.ino.
• Goto ecg_visualizer_arduino_PC/ and run python visualizer.py. If the serial port name is incorrect, edit visualizer.py.
• Press the hi-z electrodes across the heart and press the RLD electrode to the leg or forehead. Alternatively, the outer ring of one of the hi-z electrodes can be connected to the RLD electrode. For more details, see the technical report in report/ecg_tech_report.pdf. You should now see an ECG signal on the PC display.
• Note that a laptop (with the power cord removed) must be used to power the Arduino. Preferably, keep the laptop on your lap. Interference will be much worse if a mains powered desktop is used; the interference may be so strong as to saturate the amplifiers leading to no useful ECG signal at all.

Wireless ECG with Bluetooth Low Energy (BLE using CC2540):

• Build the circuit in schematics/ecg_CC2540.png. A more complete schematic is in schematics/ecg_CC2540_full.png. Program the CC2540 in the circuit with the hex file ecg_CC2540/hexfiles/SimpleBLEPeripheral.hex.
• Connect the CC2540 USB dongle to a PC (either a laptop or a mains powered desktop will do). Program the CC2540 USB dongle with the hex file ecg_CC2540/hexfiles/CC2540_USBdongle_HostTestRelease_All.hex.
• Goto ecg_visualizer_ble_PC/ and run python visualizer.py. If the serial port name is incorrect, edit visualizer.py.
• Press the hi-z electrodes across the heart and press the RLD electrode to the leg or forehead. Alternatively, the outer ring of one of the hi-z electrodes can be connected to the RLD electrode. For more details, see the technical report in report/ecg_tech_report.pdf. You should now see an ECG signal on the PC display. A sample recording may be found here.
• Note that the CC2540, which is gathering ECG data and transmitting wirelessly, has to be powered by a battery (ex: CR2032 coin cell). If a mains power source is used, interference will be much worse.