![]() In this article we have created a prototype on breadboard with Arduino to control an RGB LED. ![]() The more willing can try adding a button to turn on the RGB LED, combining the code just presented with that of a previous article. ![]() rgb (36, 77, 213), copy the string and paste it into this color picker what color do you get? Also try to check if the light emitted by the LED corresponds to the color identified by the color picker, commenting on the calls to the random function and assigning the values of a triplet generated on the monitor. Try to print the values in rgb format on the serial, eg. What happens if we replace the calls to analogWrite with digitalWrite? Here is an example of output: RED: 44 - GREEN: 72 - BLUE: 30 In this case it is very useful for varying the colors of the LED: at each iteration a random color will be obtained, which will be maintained for 2 seconds by calling the delay function.įinally, the blue, green and red values are printed on the serial monitor. Unlike digitalWrite, which manages the two states LOW and HIGH, analogWrite can send different gradations of values to the Arduino pins. Once we have the three random values, we pass them to the analogWrite function to send the analog signal to each pin. The first parameter passed to random is precisely the minimum value 0 from which to generate random numbers, while the second is the maximum value (255). In the loop, the random function generates random values between 0 and 255 for the constants that will create the RGB triplet to be sent to the LED. send the values assigned to the pins to the serial monitorīy means of the preprocessor directives, the constants of the pins to which the LED connectors are connected are defined subsequently, in the setup function of Arduino, after having initialized the serial communication, the pins are set to zero volts. ![]() initialization of serial communication Let’s see the code of our project immediately: // red pin If necessary, refer to the resistance calculation form to find the combination of colored strips you prefer. The resistors, as usual, have the task of limiting the flow of current to the LED if you prefer it to emit less light, use higher value resistors. To better highlight the connections, I used jumper cables of the color corresponding to that of each pin of the led. The circuit to control the RGB led with Arduino RGB led circuitĪs you can see from the photo above, the red LED connector has been connected in series with a resistor at pin 13 of Arduino immediately after the common cathode to pin GND, while the green connector was connected to pin 12 and, finally, the blue to pin 8.
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