![]() ![]() Drag a photoresistor from the components panel to your breadboard, so its legs plug into two different rows.Wire up the LED anode (positive, longer leg) to Arduino pin 9.The resistor can go in either orientation because resistors aren't polarized, unlike LEDs, which must be connected in a certain way to function. Plug the LED into two different breadboard rows so that the cathode (negative, shorter leg) connects to one leg of a resistor (anywhere from 100-1K ohms is fine).Extend power and ground rails to their respective buses on the opposite edge of the breadboard (optional for this circuit but good common practice).Connect breadboard power (+) and ground (-) rails to Arduino 5V and ground (GND), respectively, by clicking to create wires.Drag an Arduino Uno and breadboard from the components panel to the workplane, next to the existing circuit.Identify the photoresistor, LED, resistors, and wires connected to the Arduino in the Tinkercad Circuits workplane.In this step, you will build your own version of this circuit along side the sample in the workplane. It can be useful to look at a free-wired version of this sample circuit for comparison, pictured. Take a look at the breadboard circuit in the workplane. ![]() To optionally build the physical circuit, gather up your Arduino Uno board, USB cable, solderless breadboard, an LED, resistors (220 ohm and 4.7k ohm), photoresistor, and breadboard wires. In this lesson, you'll build this simulated circuit yourself along side the sample. Įxplore the sample circuit here in the workplane by starting the simulation and clicking on the photoresistor (brown oval with squiggly line down the middle), then drag the brightness slider to adjust the simulated light input. Remember that Arduino's analog inputs (pins marked A0-A6) can detect a gradually changing electrical signal, and translates that signal into a number between. So far you've already learned to read a potentiometer, which is another type of variable resistor, so we'll build on those skills in this lesson. It's also called an LDR (light-dependent resistor). Let's learn how to read a photoresistor, a light-sensitive type of variable resistor, using Arduino's Analog Input. ![]()
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