[JT118]

The reading on my website www.ayrshireweather.org is from my old Davis Groweather using sensor 7821 http://davisnet.com/support/weather/supp...sp?dtype=2 and the photos are of an old one of these bought as box of bits some years ago, don't forget this sensor is now at least 15 years old. However Davis are very good and a complete Davis Groweather would have cost at least £1500 in 2000. They are very good stations and mine continues to work with few problems.

However I am going to attemp to build a weatherduino station with the bits and sensors I have collected over the years.

some links of interest:
http://archives.sensorsmag.com/articles/.../index.htm
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3291930/
http://www.eppleylab.com/solar.htm
www.kippzonen.com
http://www.instesre.org/construction/pyr...ometer.htm
The solar sensor in cars is often located in the top part of the dashboard at the base of the windscreen .
[IMG]file:///G:/image/199001482.image[/IMG]
1 - Solar sensor
2 - Output current lighting typical diagram
3 - Diagram showing operation of solar sensor

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Just a few more pictures which previous post missed.

Also re cost;

2272 op amp: £2.81 http://www.ebay.co.uk/itm/TEXAS-INSTRUME...5aef81a167
VTB8440 photodiode £5.10 (nearest spec I could find to old version above. http://www.ebay.co.uk/itm/VTB8440BH-Phot...0873564672