Theory, hardware, software and code
Hardware projects
We're talking about one of the most famous, useful and supported software for electronic design automation (EDA).
Other apps or packages are available to do same: Kicad is free (in sense of free software: code is publicly available), and usually at zero-cost, so that you can start with your projects, from simplest to more professional ones, without any other cost.
...continue reading "KiCAD. From Software to Hardware Part1"
Let's start with a simple arduino project. A blinking led. 
The digital pins of an Arduino have a maximum load rating of 40mA, so we do not want to exceed that. The voltage of the digital output pins are 5V.
So arduino digital output pins have these limitations :
An Imax=40mA and Vout=5V. The led needs up to 20mA maximum. So we can easily power it directly from arduino board.
From the Ohm's Law we have V=Iled*R => R = V/Iled = 5V/0.02A = 250 Ω. For security reasons we use a bigger resistor (330Ω) so that the Iled<Imax.
...continue reading "From an arduino project to a standalone one"
Good arduino projects require documentation.
Free documentation is even better !
Selecting a firewall is not a trivial decision. Generally all firewalls are software-based. The embedded firewalls are simply very limited-capability programs running on a low-power CPU in order to obtain lower power consumption. You have to list your needs and select the software and then the dedicated hardware that can handle them. As first step we need to list our needs for the firewall.
...continue reading "How to assemble a low cost firewall with professional capabilities"
