pimoroni-pico/examples/servo2040/servo2040_led_rainbow.cpp

60 lines
1.2 KiB
C++

#include "pico/stdlib.h"
#include "servo2040.hpp"
#include "button.hpp"
/*
Displays a rotating rainbow pattern on the Servo 2040's onboard LED bar.
Press "Boot" to exit the program.
*/
using namespace plasma;
using namespace servo;
// The speed that the LEDs will cycle at
const uint SPEED = 5;
// The brightness of the LEDs
constexpr float BRIGHTNESS = 0.4f;
// How many times the LEDs will be updated per second
const uint UPDATES = 50;
// Create the LED bar, using PIO 1 and State Machine 0
WS2812 led_bar(servo2040::NUM_LEDS, pio1, 0, servo2040::LED_DATA);
// Create the user button
Button user_sw(servo2040::USER_SW);
int main() {
stdio_init_all();
// Start updating the LED bar
led_bar.start();
float offset = 0.0f;
// Make rainbows until the user button is pressed
while(!user_sw.raw()) {
offset += (float)SPEED / 1000.0f;
// Update all the LEDs
for(auto i = 0u; i < servo2040::NUM_LEDS; i++) {
float hue = (float)i / (float)servo2040::NUM_LEDS;
led_bar.set_hsv(i, hue + offset, 1.0f, BRIGHTNESS);
}
sleep_ms(1000 / UPDATES);
}
// Turn off the LED bar
led_bar.clear();
// Sleep a short time so the clear takes effect
sleep_ms(100);
}