There are many commercially available personal weather stations costing anywhere from hundreds to thousands of dollars depending on the available features. In this project we will create our own personal weather station using a Raspberry Pi as the base station and XBee wireless modules to communicate with the outdoor sensors.
By creating our own weather station we have the ability to add the sensors we want as well as the features we want. We can create graphs of the data we capture as well as compute other interesting weather data such as temperature and humidity trends.
There are many interesting sensors that are not usually available on commercial weather stations such as; lightning, UV, outdoor humidity and solar intensity.
We will also use this project to learn more about wireless transmitters and receivers as we will use XBee wireless modules to connect the remote sensors back to the raspberry Pi base station.
Added a couple of tutorials on working with LEDS. More to come...
LEDS are great to use for model railroad layouts. With the right control circuitry you can make your model railroad layout come alive with all sorts of special lighting effects.
Traditionally you would use a 555 timer and some discrete components to produce limited LED lighting effects like railway crossing lights and flickering campfires. This usually involved building complicated circuits that were time consuming to build and prone to wiring errors. The effects you can achieve with discrete components are also limited.
I have some basic circuits built around a small microcontroller that is pre-programmed with the particular lighting effect. The circuits are simple to build since all the complex effects are done in the code in the microcontroller. The external logic is just a few resistors and the LEDS themselves.
Most of the LED effects either combine multiple effects
into one circuit, or have multiple outputs allowing you to have more
than one of the effect on your layout.
Read more ...