Some weeks ago I bought a really cool book – “Getting Started with Arduino”, which was written by the co-founder of Arduino Massimo Banzi.
This little booklet offers a thorough introduction to the [Read more…]
Calculating LED resistor value, this is very easy and the most of you had this in the school.
A typical LED requires 20 mA and has a voltage of 2 V across it when it is working. The power supply for the circuit could be 9 V – Block battery.
For the right calculation you need three values:
1. Power supply (Your Battery 9 V)
2. LED voltage (2 V)
3. The current flowing (20 mA)
It was another great weekend with DIY idea:)
Its a kind of mini lamp for the desk with nice colors.
Nagios and Icinga have a lot of notification opportunities, receive status via Mail, SMS, Twitter or maybe XMPP? Sometimes is it not easy to decide what you really need and what is better for your quick reaction.
If you have more than one monitor it is easy to overlook an important mail, or your mobile phone is in silent mode and you don’t know that you get a critical notification.
Sometimes in the evening is music great to relax or to hear to it incidentally while you do something.
I combined light with music – no so extreme like in the disco.
I bought some LEDs and a couple of TIP31 transistors. Transistors are the main key to the result! The first test was done on a breadboard.