Another electronic DIY? No, we already have in the previous news! The already reported device and a couple of electrode pads readily give a handy wireless ECG. As in the picture, the electrodes are just spare pads used for elctronic muscle stimulators. These pads are effective enough and cheap. The picture right below is a real-time monotoring of the ECG.

So, the device is a pH meter reprogrammed to give several hundred-fold of voltage amplification. For more detail, please refer to the application note AN2284 in the Cypress Semiconductor web site. For our saftey, the PSoC ECG was powered by a battery, and isolated from the host computer through wireless communication. Even then, please do it at your own risk.

Communication to the host PC was established through a serial Bluetooth modem (BlueSMiRF) and a Bluetooth USB module obtained from Spark Fun Electronics. The wireless communication greately reduced the noise in the monitoring ECG. At present the ECG has only a 50-Hz software notch filter to block AC noise. Adding a low-pass filter, hard or soft, will further reduce noise to give practical ECG signals.

EEG? We may need another trick or two. The voltage amplification should be several thousand fold. The EEG signal will be even smaller than ECG...