Photoresistor

J

jabal29

New Member
..I bought solar bulbs from Ali Express and I want automatic turn on and off according to ambient light..So I bought photo resistors to hook on the bulb system..There is a switch on the bulb to turn the light on with several sequences of lighting..How should I bypass that switch so to have the photo resistor control the light on and off..?
 

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You bought the wrong light bulbs. To modify a device, you must learn exactly how was it designed. Do you have a schematic ? Are you aware if there is a microcontroller with firmware/program in it ?
 
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I don't know too much about electronics.. however I think it should not be very difficult to get the photoresistor operating..I thought you could tell me if I should plug it on the battery+ or -..or on the LEDs..
 
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jabal29 said:
I don't know too much about electronics.. however I think it should not be very difficult to get the photoresistor operating..I thought you could tell me if I should plug it on the battery+ or -..or on the LEDs..
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You think wrongly - a photo-resistor isn't a switch, you would need to add a fair few more components (such as a comparator and associated components) to make it operate as one.
 
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Some circuits here to detect and switch on LEDs, attached


Regards, Dana.
 

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  • Forrest Mims-engineer's mini-notebook 555 timer circuits (radio shack electronics).pdf
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  • Il timer 555.pdf
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Nigel Goodwin said:
You think wrongly - a photo-resistor isn't a switch, you would need to add a fair few more components (such as a comparator and associated components) to make it operate as one.
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True, it changes resistance when exposed to light. To get it working you probably need a transistor and some other components like in this schematic.
 
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Years ago, solar garden lights used photo-resistors that got sunburned and failed. New solar garden lights use the glass-covered solar panel to detect light and turn the LED on and off.
 
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