AAG cloudwatcher side view
AAG Cloudwatcher Cloud Detector

AAG Cloudwatcher Cloud Detector



The AAG Cloudwatcher is used at our own observatory and provide accurate and reliable data day and night, year long. Its main features are:

  • Very affordable compared to the competition
  • Durable construction
  • Measure brightness, humidity, wind and

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CloudWatcher, watching the sky since 2008.

AAG CloudWatcher advantages

(*) Find here the pice list of the REPAIRS AND SPARE PARTS for the AAG CloudWatcher.

The AAG CloudWatcher includes:

  • custom box with a special exterior finish that includes:
        • Clouds sensor
        • Rain sensor
        • Light sensor
        • Temperature sensor
        • Relative humidity and Atmospheric pressure sensor (RH & AP versions)
        • Anemometer (optional external accessory)
  • Long weather-proof cable (several lengths) with IP68 connector
  • Relay for observatory opening/closing

Let’s see them in detail:

► The AAG CloudWatcher box. All the data collected by the AAG sensors and the anemometer are reflected in the computer through their corresponding graphics. These allow a comprehensive and easily understandable measurement of atmospheric conditions:

Clouds sensor

sensor nubes min e1585510267542

Through an infrared sensor of the AAG CloudWatcher measures the temperature of the sky, and an electronic thermometer measures the internal temperature. Both data are then related by a powerful formula used to determine the existence of clouds. The measuring result is easily read on the graphic “Cloud”.

Unlike other detectors, the AAG CloudWatcher allows the user to set the parameters for measurement, and thus adjust the detection of clouds for each place.


sensor nubes min e1585509814339

Rain sensor

sensor lluvia esc min e1585510226207

CloudWatcher uses a variable capacitor to determine the existence of rain. In addition, the capacitor incorporates an internal resistance for heating the element, drying it, which allows a constant reliable reading.


Light sensor

sensor luz esc min e1585509770577
To distinguish between day and night. It can even detect the Moon.AAG Cloudwatcher.

Temperature sensor

sensor temp min e1585509699425
Responsible for measuring the ambient temperature.

Relativity humidity sensor (RH & AP version)Pantalla AAG CloudWatcher SOLO HS min e1585511111999
The data from this sensor are supported by the SOLO CW (attached image).If you want to take a look at our SOLO installed in Torrelodones, Madrid, Spain, click here: http://aagsolo.lunatico.es:10800/Windows program displays the value in the screen, with the dew point, and the data are included in the “Single line data” file (*).
Anemometer (OPTIONAL)

Pantalla AAG CloudWatcher Viento min

Shows the wind speed.


►The AAG cable connects the CloudWatcher instrument to a PC and it is available in 4 lengths: 3, 5, 7, or 10m. (From 2018/November you also can get the AAG CloudWatcher without cable).cable IP68 3 min

It has a special weather-proof connector, IP68, which allows the easy and comfortable installation of the unit. The cable can be routed conveniently through a conduit, the thicker part of it is only 19mm in diameter.

IP68 Weipu connectors for power cable and anemometer
IP68 Weipu connectors for power cable and anemometer


► Relay (1) for observatory opening/closing, can withstand a voltage of 220 V. But not being a security cable it is advised to connect it to low voltage devices (12 or 24V).


Technical specifications:

  • Power 12 or 15V, current < 1 A
  • RS232 Serial port (**)
  • Size: 110*85*37 mm.

(**) USB to RS232 adapter available here.

In addition, the AAG CloudWatcher software incorporates advanced features such as:

  • Multiple users in LAN (MASTER mode and REMOTE mode operation);
  • MASTER and REMOTE installations can be independently parameterized;
  • Sky temperature correction model to account for excessive atmospheric longwave radiation during summer;
  • All alerts can be defined as sound alerts, with a specific sound file to be played when the alert condition occurs;
  • Switch control can be disabled and be performed by an external program (suitable to control other equipment);
  • Allows the electrical constants to be changed by the user;
  • A complete set of properties/methods for inter-program communications;
  • Compatible with existing firmware versions 1.xx, 2.xx and future version 3.xx;
  • ACP, Sequence Generator+, CCDCommander, CCDAutopilot, Prism, CCDAutoPilot, and Maxpilote compatible; plus any ASCOM-compliant software.
  • With the program, AAG WeatherCentre (***) can combine information from any standard weather station supported by Virtual Weather Station, Weather Display, or Cumulus software.
  • Several free programs for mobile devices, for example, the one developed by Francisco Jesús Cortés to allow you to receive an alarm on your mobile phone.


Additional information

Cable Length

10ft, 15ft,20ft,30ft

Relative Humidity & Pressure Sensor

Include, Do not include


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