Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Ambitious project of measuring most of physiological signals

Human body emits many signals that can be captured for diagnostics. Probably most heard of them is ECG (Electrocardiogrphy). But there are many more bio-signals that can tel much about our health status. These are EEG (Electroencephalography) – brain activity, EMG (Electromyography) – muscle activity, ENG (Electronystamography) and EOG (Electrooculography) – eye movement. Each of these signals are very weak and irresistible to noise. To there is a special care taken of analog part of circuit. Analog part is driven by ADS1299 – 8-channel 24 bit ADC which takes care of reading ECG signals. Digital part is based on ATSAM3X microcontroller which is Arduino compatible. Currently project is at ECG measuring position. But since it’s been released as open source project, it will grow up to include the rest measuring options. To track its current stage and add your thoughts you can at github. Continue reading

MobileECG may be next great open hardware project

There isn’t much open hardware medical instrumentation projects that can be considered completed and reliable. MobilECG project could pretend to be one that could compete with medical grade devices. Actually Péter, the founder of project, intended to collect decent amount of funding to get medical certification. But campaign didn’t went as planned, so he decided to make project open. Since the most of work is already done it would be sad to see project die. The decision to make it open is plausible and maybe it will completed with help of community. MobilECG is very compact device that can measure ECG using 12 leads. The ECG signal is digitized using TI’s ADS1278 eight channel ADC. For interfacing and communication to host there are two AVR micros used – Attiny24 and ATU64. Schematic is developed using KiCAD software. Firmware isn’t complete – only minor functionality with several known bugs. Anyone with biomedical engineering knowledge will definitely see the potential of this device that can be attached to any device like PC, android or other and explore own ECG signals. Continue reading

Catching mains electromagnetic disturbances with Arduino

Parasitic electromagnetic fields can cause troubles when working with sensitive measuring equipment. One of these are ECG – an electrocardiograph. It deals with very low voltage bio-signals, so any small interference leads to output fluctuations. Modern electrocardiographs have quite effective filters and methods that can deal with most common noises, but it is better to avoid than post process. This Arduino Mega based EMF tester simply tries to capture 60Hz EMF noise by using simple antenna attached to analog input. When antenna captures some significant 60Hz electromagnetic noise LEDs indicate its intensity. So it may be handy tool to hunt for noisiest equipment around. As it is easy to build it can be interesting to play around. Probably it could be used to find hidden wires in the wall that are less than 1inch deep. Continue reading