Archive for July, 2007

What are MEMS

Tuesday, July 31st, 2007

Today MEMS is common acronym among engineers. Therm MEMS stands for micro-electro-mechanical system and was started to use in 1980sin USA. MEMS are called system because they are not only sensors bu also contain electronic circuitry inside which conditions sensor signal. Simply speaking MEMS is usually a chip device which integrates mechanical elements, sensors, actuators [...]

Controlling graphical 128×64 LCD based on KS0108

Friday, July 20th, 2007

HQM1286404 is pretty old graphical LCD module but it is still popular. This LCD is controlled by KS0108 lcd controller via two segment drivers. LCD backlight color is yellow-green. I think this is good choice for many projects where graphical information needed because of several reasons – you can find libraries around the internet to [...]

Non-linear adaptive filtering using neural networks

Saturday, July 14th, 2007

Neural network signal filters are more adaptive filters than Wiener filters where resulting signal is a product of minimisation mean-square error, Wiener filter is linear filter which is adapted for some specific environment. But linear adaptive filters are limited when noise has Gaussian process pattern. So if significant Gaussian noise is present then there is [...]

Adaptive ECG artefact noise cancelling using accelerometer

Saturday, July 14th, 2007

Electro-cardiographic examination may be performed not only from patients who is laying or sitting down peacefully, but also under stress conditions as some deceases may be detected when patient isn’t in the rest. For this ECG should be measured when patient is actively moving. We know that ECH signal is very weak among various [...]

What is worst-case timing analysis

Monday, July 9th, 2007

Probably many of you PC hardware people have faced similar problems when assembling computer from different parts and it seemed to work properly. But under some circumstances system just crashes without any known reason. Even in my practice I had a sound-card that that works well, but time at the time it just crashes and [...]

Electronic design and development process

Monday, July 9th, 2007

There are so many ways of designing and developing of electronic devices, that it is hard to think which would fit your needs and desires. But there are common steps that probably fit in most cases that allow to implement the electronic system from top to bottom:
1) Defining the requirements of electronic system;
2) Collecting information [...]