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tutorials:learn:sensors:cds.html [2010/10/07 19:15] daigo |
tutorials:learn:sensors:cds.html [2016/01/28 18:05] (current) |
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***Size: **Round, 5mm (0.2") diameter. (Other photocells can get up to 12mm/0.4" diameter!) | ***Size: **Round, 5mm (0.2") diameter. (Other photocells can get up to 12mm/0.4" diameter!) | ||
***Price:** [[http://www.adafruit.com/index.php?main_page=product_info&cPath=35&products_id=161|$1.00 at the Adafruit shop]] | ***Price:** [[http://www.adafruit.com/index.php?main_page=product_info&cPath=35&products_id=161|$1.00 at the Adafruit shop]] | ||
- | ***Resistance range: **200KΩ (dark) to 10KΩ (10 lux brightness) | + | ***Resistance range: **200K Ω (dark) to 10KΩ (10 lux brightness) |
***Sensitivity range:** CdS cells respond to light between 400nm (violet) and 600nm (orange) wavelengths, peaking at about 520nm (green). | ***Sensitivity range:** CdS cells respond to light between 400nm (violet) and 600nm (orange) wavelengths, peaking at about 520nm (green). | ||
***Power supply:** pretty much anything up to 100V, uses less than 1mA of current on average (depends on power supply voltage) | ***Power supply:** pretty much anything up to 100V, uses less than 1mA of current on average (depends on power supply voltage) | ||
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|**300 - 500 lux**|Sunrise or sunset on a clear day. Well-lit office area.| | |**300 - 500 lux**|Sunrise or sunset on a clear day. Well-lit office area.| | ||
|**1,000 lux**|Overcast day; typical TV studio lighting| | |**1,000 lux**|Overcast day; typical TV studio lighting| | ||
- | |**10,000–25,000 lux**|Full daylight (not direct sun)| | + | |**10,000 - 25,000 lux**|Full daylight (not direct sun)| |
- | |**32,000–130,000 lux**|Direct sunlight| | + | |**32,000 - 130,000 lux**|Direct sunlight| |
==== Testing your photocell ==== | ==== Testing your photocell ==== |