pro2_transmitter - WeatherDuino WiKi

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====== Pro2 Transmitter ======

===== Overview =====

The WeatherDuino Transmitter units are a very important part of the system. They not only transmit[([[:common_questions_weatherduino_system#how_data_is_transmitted|How data is transmitted]]?)] all the data to the WeatherDuino receiver, but are also the interface where you will connect all weather sensors[([[:supported_weather_instruments#list_of_compatible_weather_instruments|List of Compatible Weather Instruments]])] that you intend to use.\\
Only one Transmitter unit is needed to build a fully featured WeatherDuino weather station, however, you can use up to four Transmitter units per system. The main reason why someone may want to use more than one Transmitter unit is to get a better positioning of the weather sensors. For example, one Transmitter may be used for sensors that are usually placed above the roof, like the anemometer and wind vane, and another Transmitter for the sensors that should be placed near the ground level, like temperature / humidity sensors, rain gauge, or even soil moisture sensors.

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===== Notes and hints on assembling =====

A detailed parts list can be downloaded from here: [[http://www.meteocercal.info/forum/attachment.php?aid=530|WeatherDuino Pro2 TX v3.12 - Parts List]].

Each WeatherDuino transmitter comprises a single printed circuit board (PCB) approximately 100mm x 60mm. The PCB has two main functions. First, it provides an interface to a number of sensors via connectors mounted around two sides of the board. Second, it provides a radio frequency (RF) link between an Arduino Nano microcontroller and a remote WeatherDuino receiver. Two RJ45 Ethernet-style sockets provide connections to a rain sensor and an anemometer. Many low-cost wind/rain sensors use these connectors but beware that not all use the same pin arrangement.

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Apart from the rain gauge and anemometer, the PCB provides inputs for two analogue sensors (nominally solar radiation & UV), and three digital inputs (two I<sup>2</sup>  C). It also has a 9 volt output which may be turned on and off by the WeatherDuino software. A typical use for this would be to control the fan in an aspirated radiation shield. The PCB has a space for a line driver IC which may be needed if the I<sup>2</sup>  C sensors are not mounted close to the transmitter. It's a good idea to fit a DIL socket in this position so that the IC can be easily fitted later if needed.

RF communication is provided by a small daughter board located near the SMA aerial socket. Other major components on the PCB are a voltage regulator and a MosFET transistor which controls the external power feed. One very useful feature of the transmitter board is a temperature sensor. Although this is not as accurate as the off-board temperature sensor(s) it does provide an indication of conditions in the transmitter box.


====== Where I can get the WeatherDuino Pro2 Transmitter? ======

All info about prices, availability and how to order can be found here: [[http://www.meteocercal.info/forum/Thread-Printed-Circuit-Boards-for-the-WeatherDuino-Pro2-PLUS-system|WeatherDuino Pro2 Transmitter, prices and availability]].
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