ECG-EEG

A simple wireless ECG-EEG circuit is shown below using On-Off Keying (OOK)

The EEG-ECG signal is amplified by means of the AD627 instrumentation amplifier. Due to the reference voltage of 1.8V at pin 5, the output voltage is positive and can be converted directly by the MCU PIC12F683 with a 10 bit resolution. The transmitter Tx is a low cost SAW resonator driven by the MCU using a serial 9600 Baud protocol.

The receiver Rx uses a Parallax RF receiver module (http://www.parallax.com) and a PIC12F683 for decoding the data. The serial communication with the PC uses a FTDI chip FT232 at 19200 Baud. For displaying the received data a Python program similar to the MCU DAQ (MCU) is used. Below a recorded EEG (f9-f10) is shown.