The sunshine recorder has been built in-house, it is designed to record how much sunshine has been captured during each day. The device has an analogue clock which displays how much sun we have received, and a output for a EL-USB-5 Counter, Event and State USB Data Logger ,giving you an accurate account of the duration of sunlight each day. It is a very versatile mobile unit intended to be used in a variety of areas. I will put more details on the website once I have completed 12 months of testing. This instrument could also be converted for a USB port and a one wire weather station add-on.
The Campbell–Stokes recorder (sometimes called a Stokes sphere) is a kind of sunshine recorder. It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes. The original design by Campbell consisted of a glass sphere set into a wooden bowl with the sun burning a trace on the bowl. Stokes's refinement was to make the housing out of metal and to have a card holder set behind the sphere.
The unit is designed to record the hours of bright sunshine which will burn a hole through the card.
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In the last couple of weeks I've been experimenting with a different type of reflector for the sun duration sensor
The reflector is a body of a halogen light bulb. I carefully removed the top part of the glass and removes the halogen light bulb from the centre. I Drilled a hole through the centre of the ceramic material that holds the halogen bulb in place , then I removed the light sensor from the circuit board and mounted the sensor inside the reflector,using some epoxy resin glue, the next stage was to resolder the LDR sensor to the circuit board, make sure you try and keep the reflector in the centre. I placed a domed glass bead on top of the LDR sensor this makes it incredibly accurate no false activation of the really using this technique. It doesn't matter how cloudy or how bright the sky is it will only activate when the sun is totally clear of any clouds I have tilted the instrument on a angle, so the sun Reflection is off centre in the top glass dome reflector .this gives outstanding results and a massive improvement over the previous builds please note if you take a lightbulb apart, please use safety glasses and protective gloves, please do not attempt this. If you are not confident in working with glass materials the glass bead was made in house
I have gone back to using a LDR sensor , with a fisheye lens on top of the sensor this is giving good results.
The fisheye lens was originally used on my phone camera, you can buy these attachments which include a metal washer which I glued over the top
of the sensor, there is a magnet in the fisheye lens which secures in place on the washer.
Latest image of the sun duration which now has a full angle adjustment.