LED Dimmer for 220-240V Lamps HowTo

This article is primary for those in a country with a 220-240V~50Hz electrical system. Do you know how it is when you sit in a room, somebody comes in, turns the light on and it becomes way too bright? If you turn off the light again, then the other person won't be satisfied. So why not agree on a level between no light and full brightness? This article explains how to dim 200-240 Volt Dimmable LED light bulbs. Two
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Temperature and Humidity from AM2302/DHT22 Sensor Displayed as Chart

In this how-to, the Raspberry Pi will be configured to automatically acquire and log temperature and humidity from a AM2302/DHT22/DHT11 sensor and display the collected data like in the following picture. About the AM2302/DHT22 Temperature and Humidity Sensor The AM2302 and DHT22 sensors share the same characteristics. From my perspective these sensors are the same. The DHT11 on the other hand is a little cheaper but only intended for indoor use. On e-Bay you can find a
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Surveillance with Raspberry Pi NoIR Camera HowTo

There are hundreds of ready-to-use surveillance IP cameras. But the more you look at a specific one the more drawbacks you find. The article will show how to use the RPi camera in a custom surveillance setup. When motion is detected, then spot lights will be turned on and high quality pictures will be taken that are immediately uploaded to google drive. Rasperry Pi Camera Facts Dimensions:25 mm x 20 mm x 9 mm Weight:3 g Max resolution:
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Free Dynamic DNS Service Subdomain HowTo

There is a new free non-profit Dynamic DNS (DDNS) service which can be used as free alternative for subscription based services like dyndns.org or no-ip.com. The provider website is, at the time of writing, only in German but the setup is very simple and explained step by step below. The article will explain What is Dynamic DNS (DDNS)? How to get your free subdomain as myhomepc.ddnss.de in two minutes? How to configure your router to update
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A20-OLinuXino-LIME/LIME2/MICRO LCD Touch Screen Setup HowTo

Olimex offers several LCD and resistive touch LCD displays. The touch displays go from 4.3 inch to 10 inch, and the no-touch up to 15.6 inch. The resolution is up to 1920x1080 for the 15.6 15.6FHD LCD. They can all be connected to the A20-OLinuXino and A13-OLinuXino systems but the 10 and 15.6 inch displays are not recommented for the A13-OLinuXino because of its lower computing power. The article will explain Which parts are needed
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