SunFounder ESP32 User Manual

SunFounder ESP32 Starter Kit
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}
Here we use the (LED control) peripheral which is primarly designed to control the intensity of LEDs,
although it can also be used to generate PWM signals for other purposes.
• uint32_t ledcSetup(uint8_t channel, uint32_t freq, uint8_t
resolution_bits);: This function is used to setup the LEDC channel frequency and
resolution. It will return frequency configured for LEDC channel. If 0 is returned, error occurs
and ledc channel was not configured.
– channel select LEDC channel to config.
– freq select frequency of pwm.
– resolution_bits select resolution for ledc channel. Range is 1-14 bits (1-20 bits for
ESP32).
• void ledcAttachPin(uint8_t pin, uint8_t chan);: This function is used to attach the
pin to the LEDC channel.
– pin select GPIO pin.
– chan select LEDC channel.
3. The loop() function cycles through various colors (red, green, blue, yellow, purple, and cyan) with one-second
intervals between each color change.
void loop() {
setColor(255, 0, 0); // Red
delay(1000);
setColor(0, 255, 0); // Green
delay(1000);
setColor(0, 0, 255); // Blue
delay(1000);
setColor(255, 255, 0); // Yellow
delay(1000);
setColor(80, 0, 80); // Purple
delay(1000);
setColor(0, 255, 255); // Cyan
delay(1000);
}
4. The setColor() function sets the desired color by writing the appropriate duty cycle values to each PWM
channel. The function takes in three integer arguments for red, green, and blue color values.
void setColor(int red, int green, int blue) {
// For common-anode RGB LEDs, use 255 minus the color value
ledcWrite(redChannel, red);
ledcWrite(greenChannel, green);
ledcWrite(blueChannel, blue);
}
• void ledcWrite(uint8_t chan, uint32_t duty);: This function is used to set duty for
the LEDC channel.
– chan select the LEDC channel for writing duty.
– duty select duty to be set for selected channel.
30 Chapter 1. For Arduino User

SunFounder ESP32 Specifications

General

Brand	SunFounder
Model	ESP32
Category	Controller
Language	English