Old solar garden lights used an LDR but they got sunburned after 2 years outside. New solar garden lights use the glass-covered solar panel to detect light and dark. Old solar panels with a plastic cover also got sunburned and failed after a couple of years.
Old solar garden lights used an LDR but they got sunburned after 2 years outside. New solar garden lights use the glass-covered solar panel to detect light and dark. Old solar panels with a plastic cover also got sunburned and failed after a couple of years.
Fine, buy one as pictured in post #4 ; dismantle it to pieces. Now you have ALL the parts to build one to train all your technicians explaining how to build one...
Have you tried a web search for "photoresistor relay circuit"
Here is one of the ones that comes up right away when I do that
**broken link removed**
I just noticed you said Triac, just a second...
I also get a lot of results with "photoresistor triac circuit" I picked one that has specific component numbers. If some components are hard to get where you live, there are at least 50 results you could browse to find one that suits you.