ทดสอบการควบคุมหลอดไฟ LED 3 สี (RGB) ด้วยบอร์ดพัฒนา NodeMCU ESP-12E

#define R_pin D0                // Red GPIO16
#define G_pin D1                // Green GPIO5
#define B_pin D2                // Blue GPIO4
int start_R = 0;                // Initialize red as zero
int start_G = 0;                // Initialize green as zero
int start_B = 0;                // Initialize blue as zero
void setup() {
 pinMode(R_pin, OUTPUT);       // Initialize the R_pin as an output
 pinMode(G_pin, OUTPUT);       // Initialize the G_pin as an output
 pinMode(B_pin, OUTPUT);       // Initialize the G_pin as an output
}
void loop() {
 displayRGB(0, 0, 0);          // Drive RGB LED with 3-bit data (No color)
 delay(2000);                   
 displayRGB(1, 0, 0);          // Red
 delay(2000);
 displayRGB(1, 1, 0);          // Yellow
 delay(2000);
 displayRGB(0, 1, 0);          // Green
 delay(2000);
 displayRGB(0, 1, 1);          // Cyan
 delay(2000);
 displayRGB(0, 0, 1);          // Blue
 delay(2000);
 displayRGB(1, 0, 1);          // Magenta
 delay(2000);
 displayRGB(1, 1, 1);          // White
 delay(2000);
}
void displayRGB(int R, int G, int B) {
 // Send 3-bit digital data to 3 output pins function
 digitalWrite(R_pin, R);
 digitalWrite(G_pin, G);
 digitalWrite(B_pin, B);
}

หรืออีกตัวอย่างเป็นโปรแกรมที่ทำให้หลอดไฟ LED แต่ละสีค่อย ๆ ติดและดับ
#define R_pin D0 // Red GPIO16
#define G_pin D1 // Green GPIO5
#define B_pin D2 // Blue GPIO4
int start_R = 255; // Initialize red as 255 (maximum)
int start_G = 0; // Initialize green as zero
int start_B = 0; // Initialize blue as zero
void setup() {
 pinMode(R_pin, OUTPUT); // Initialize the R_pin as an output
 pinMode(G_pin, OUTPUT); // Initialize the G_pin as an output
 pinMode(B_pin, OUTPUT); // Initialize the G_pin as an output;
}

void loop() {
 for (int i = 0; i < 256; i++)               // Set loop
 {
   start_B = 0;                              // Clear BLUE data
   start_G++;                                // Increase GREEN data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
 for (int i = 0; i < 256; i++)
 {
   start_R--;                                // Decrease RED data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
 for (int i = 0; i < 256; i++)
 {
   start_R = 0;                              // Clear RED data
   start_B++;                                // Increase BLUE data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
 for (int i = 0; i < 256; i++)
 {
   start_G--;                                // Decrease GREEN data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
 for (int i = 0; i < 256; i++)
 {
   start_G = 0;                              // Clear GREEN data
   start_R++;                                // Increase RED data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
 for (int i = 0; i < 256; i++)
 {
   start_B--;                                // Decrease BLUE data
   displayRGB(start_R, start_G, start_B);    // Drive LED with PWM
   delay(30);                                // Short delay
 }
}
void displayRGB(int R, int G, int B)          // Drive LED with PWM by using analogWrite function
{
 analogWrite(B_pin, B);
 analogWrite(G_pin, G);
 analogWrite(R_pin, R);
}