Brigadoon - An Occasional Corner on the Internet
Electronic Sensors
Designed by Mark Little
 
In particular, the sensors deal with navigation sensors, meteorological sensors and environmental sensors relevant to either a domestic backyard, or on a houseboat.

As a first priority, commercial sensor boards/units compatible with the Raspberry Pi will be selected. Where this is not practical, commercial sensors with an analogue output will be coupled with an Analogue to Digital Converter (ADC) that is compatible with the Raspberry Pi. Only when these two options are  not possible will a bespoke circuit be considered. This makes it easier for a wider range of people to try the sensor projects.

Another design objective for these projects is that sensors are either powered directly from the Raspberry Pi, or are capable of being run from +12V, which is the voltage of the houseboat's domestic battery. In some cases this may mean that another supply rail must be generated from the  +12V power supply.

What this means is that for the measurement of the "standard" meteorological parameters, such as temperature, humidity, wind and rainfall, the preferred method is to simply purchase a reputable weather station that can be interfaced with the Raspberry Pi, a serial port, Ethernet or even WiFi. A unit that is capable of running from +12V fulfills the second requirement. An example of where a bespoke sensor might be used is when measuring ground temperature. It is often more cost effective to use three cheap temperature sensors mounted in a waterproof pipe and buried in the ground than it is to obtain and install a commercial set of ground thermometers.
An electronic sensor is a device that detects and responds to some type of physical attribute and produces an electric output that is capable of further processing.

This website focuses on electronic sensors that are capable of relatively easy interfacing to the Raspberry Pi; and is within the resources of the average person to procure.