Light Sensor
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Posted by Jimbo on March 23, 2006, 12:18 pm
Please log in for more thread options Does anyone have a recommendation for a small sensor...something like a T-1 packaging that is a good choice for detecting to see if a door is open based upon outside light only. Basically I need an ambient light sensor. I was looking at some phototransistors but most have a visible light filter. This is for a safety switch that will look to see if any outside light is entering a cavity. Surface mount is an option but not an ideal one. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by linnix on March 23, 2006, 12:38 pm
Please log in for more thread options Jimbo wrote: We are using a T-18 photo-resistor (NSL 19M51), it has a good range (100K to 1M) for ambient light. They typically use these for night-lights. For more accurate reading, adjust the reading with a temperature sensor such as the NCP18WF104 themistor. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Jimbo on March 23, 2006, 1:19 pm
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Thanks. How do these things respond to heat? it's going to be next to a heat source that will be going up and down. There isn't any data available on their website. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by linnix on March 23, 2006, 1:31 pm
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Jimbo wrote: > Thanks. How do these things respond to heat? it's going to be next to
> a heat source that will be going up and down. There isn't any data > available on their website. We were testing them on a 40C for 8 days constant temperature chamber. We did ramp it up to 80C for stress testing, no damage at all. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by John_H on March 23, 2006, 2:23 pm
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Jimbo wrote: > Does anyone have a recommendation for a small sensor...something like a
> T-1 packaging that is a good choice for detecting to see if a door is > open based upon outside light only. Basically I need an ambient light > sensor. I was looking at some phototransistors but most have a visible > light filter. This is for a safety switch that will look to see if any > outside light is entering a cavity. Surface mount is an option but not > an ideal one. From a recent newsbit on the Avnet distributor site: http://www.avagotech.com/products/product-detail.jsp?navId=H0,C1,P94465 | ||||||||||||||||||||||||||||||||||||||||||||||
> T-1 packaging that is a good choice for detecting to see if a door is
> open based upon outside light only. Basically I need an ambient light
> sensor. I was looking at some phototransistors but most have a visible
> light filter. This is for a safety switch that will look to see if any
> outside light is entering a cavity. Surface mount is an option but not
> an ideal one.