Arduino Light Sensor Tutorial: Learn to Setup a Photoresistor

In this video I go through the steps on how to setup an Arduino light sensor circuit and the code to make it come alive. This electronics part is extremely handy if you need to make a project that needs to be able to detect changes in light. Full Tutorial: arduinomylifeup.com/arduino-light-sensor/ The parts that you will need are basic and come in most electronics starter kits so you’re likely to already have them. If not, you can pick up all the parts for pretty cheap with the exception of the Arduino Uno. The circuit is incredibly simple so you shouldn’t have many issues putting it together. If you do find it a little hard to follow, then be sure to check out the full circuit diagram over at the website linked above. It shows you exactly where parts can be placed and the correct connections. If you have never heard of a photoresistor it is small part that changes its resistance depending on how much light is on it. For example, if it is dark then the part will have a very high resistance, typically up to about 10 megohms. In the light it has a very low resistance of only just a few hundred ohms. The code is very easy to follow and much like the circuit shouldn’t be too hard to get working. We simply get the value from the light sensor input and then compare it to a static value. It is likely you will need to update these static values depending on the environment you will have your setup in. For example, inside or outside. If you’re having trouble setting it up correctly be sure to take a look at setting up some debugging and monitoring the code using the serial monitor. This should be able to help you pinpoint the problem you’re likely having. I hope that you have been able to set up this Arduino light sensor without too many problems. If you have an issue, I have got something wrong, have feedback or anything else then please feel free to leave a comment below or over at arduinomylifeup.com

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