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--- en:iot-open:practical:hardware:rtu:robotnest:rgb-led [2025/07/30 08:55] – created kivilands6
+++ en:iot-open:practical:hardware:rtu:robotnest:rgb-led [2025/07/30 09:05] (current) – kivilands6
@@ Line 2: / Line 2: @@
 This scenario presents how to handle the brightness control of the tri-coloured LEDs. Both LEDs are electrically bound and cannot be controlled independently. Those LEDs have 3 colour channels, controlled independently: R (Red), G (Green) and B (Blue). Mixing of those colours creates other ones, such as pink and violet. Each R G B channel can be controlled with a separate GPIO to switch it on or off or control brightness using a PWM signal, as presented in this tutorial.
+====== Step 1 =====
+Define the necessary pins and functions:
+<code>
+/* RGB LEDS */
+#define RED_PIN   14
+#define GREEN_PIN 15
+#define BLUE_PIN  16
+void setRGB(int red, int green, int blue);
+</code>
+====== Step 2 =====
+Define pins as output:
+<code>
+void setup() {
+  Serial.begin(152000);
+  pinMode(RED_PIN, OUTPUT);
+  pinMode(GREEN_PIN, OUTPUT);
+  pinMode(BLUE_PIN, OUTPUT);
+}
+</code>
+====== Step 3 =====
+Add a function at the end of the code:
+<code>
+void setRGB(int red, int green, int blue) {
+  analogWrite(RED_PIN, green);
+  analogWrite(GREEN_PIN, blue);
+  analogWrite(BLUE_PIN, red);
+}
+</code>
+====== Step 4 =====
+Write some code for the LED's (circle through red, green, blue light):
+<code>
+void loop() {
+  setRGB(255, 0, 0);
+  delay(1000);
+  setRGB(0, 255, 0);
+  delay(1000);
+  setRGB(0, 0, 255);
+  delay(1000);
+}
+</code>

en/iot-open/practical/hardware/rtu/robotnest/rgb-led.1753865719.txt.gz · Last modified: 2025/07/30 08:55 by kivilands6