The photocell is the small eye in the lower right corner of the bottom plate.  Dusk to dawn lights are a key element of proper outdoor lighting that every home should have. I need a DAWN-TO-DUSK 'On' photocell switch. The resistance of the device changes based on the lighting level (light levels are measured in lux). http://www.VideoJoeKnows.com Is your photocell light fixture even working? Maybe one day you happen to trip coming up the front steps in the dark. The light switch should always remain in the on position for the photocell to operate automatically. Here is a table adapted from a Wikipedia article on the topic! This setup can be used to measure the difference between the two sensors with one analog input. Thanks in advance :). You may have to wait until dusk to adjust the metal band properly. With this bulb, there’s no need to install a separate photocell or ever turn it on or off. On detecting movement, if the ambient light level is not above an ambient threshold, the PIR will switch the load on. If the photoresistor connected to ground is exposed to more light than the other one, the analog voltage would drop, and if the photoresistor connected to positive is exposed to more light, the voltage would rise. As the light level increases, the analog voltage goes up even though the resistance goes down:Vo = Vcc ( R / (R + Photocell) )That is, the voltage is proportional to the inverse of the photocell resistance which is, in turn, inversely proportional to light levels. If you don't have a manual, you can usually ascertain … That being said, there are other types of outdoor lights that can be effectively used alongside dusk to dawn lights for a cohesive, effective, and secure outdoor lighting scheme. Obviously, you know that light is important inside your home – but it can be just as important outside too! Reply The whole place is wired with Romex, I don't recall exactly, but I think the light conduit … That means that the current flowing through both resistors increases which in turn causes the voltage across the fixed 10K ohm resistor to increase. There are even some types of dusk to dawn lights that allow you to customize the light level that will activate the photocell. The ambient threshold can be set by the user to between approximately 100 lux and infinite lux (photocell inactive) via the LUX adjuster. I had to search a lot for this! And believe it or not, dusk to dawn LED lights can also help you save money in energy costs. This is especially true if you have a large outdoor area or yard with multiple light sources. break; // leave the loop } } // OK either we maxed out at 30000 or hopefully got a reading, return the count return reading;}. Adjust the time setting to the desired time you want it to activate by moving the TIME to the plus or minus. In that case, you should replace the 10K ohm pulldown with a 1K ohm pulldown. Paul . sensors detect light for sign and site illumination control. This has answered a lot of questions I had about photocells and using them with Arduino. That means you can connect them up 'either way' and they'll work just fine!Photocells are pretty hardy, you can easily solder to them, clip the leads, plug them into breadboards, use alligator clips, etc. Silly Q: is it possible to break a photocell by supllying it too much light (for example using a phone's led?). I'm trying to add a LDR to a 6V DC battery powered strobe light. As the light fades during the evening, the flow stops and the fixture is … The easiest way to hookup this device is to use a voltage divider circuit connected to an analog input pin. Really nice tutorial. It is just an adjustable stem mount unit a bit like the Hadco unit you linked to before. 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