Changes between Initial Version and Version 1 of ControlSystems/Electrical/Training/FallTraining/ProjectFour

Timestamp:

Jan 9, 2021, 3:36:51 PM (4 years ago)

Author:

Ryan Nguyen

Comment:

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ControlSystems/Electrical/Training/FallTraining/ProjectFour

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+== Materials Needed\\
+
+a. You will need: A photoresistor, an arduino, an LED, and wires.\\
+
+b. For this project, you can only use TinkerCAD, as the Arduino kits do not have any photoresistors.\\
+
+
+== Steps\\
+
+a. As the name suggests, a photoresistor is a resistor of some kind, except that it can change resistance. A photoresistor is called a variable resistor, because it’s resistance changes, and in this case, changes depending on the amount of light around.\\
+
+[[Image()]]
+
+b. A photoresistor can be used just like a normal resistor. So, we can connect the LED in series with a resistor.\\
+
+c. To do this, we can connect the cathode of the LED to the photoresistor.\\
+
+d. Then, the photoresistor connects to the GND of the Arduino so that the cathode side of the LED connects to the GND indirectly.\\
+
+e. The anode side of the LED connects to the 5v so that it can receive power.\\
+
+f. And that's it, no code required! Just click on the photoresistor and slide the circle around and see what happens.\\
+
+
+== Explanation of how it works\\
+
+a. When there is a lot of light hitting the photoresistor, the resistance drops, and so, the current increases throughout the circuit.\\
+
+b. This makes the LED brighter, as more current is passing through it, doing more work.\\
+
+c. When there is less light hitting the photoresistor, there is more resistance, and so current decreases, creating a dimmer LED due to less current passing through it.\\
+
+d. This can be used for things like light detectors for example. Photoresistors can be connected to an analog pin, and so, if there is a lot of voltage, the reading from the analog pin will be higher, indicating more light.\\
+
+e. Programming can be used to detect daytime or night time by setting a range of values that indicate daytime when the value is high enough, or nighttime when the value is low enough.