Hi everyone - I’m trying to recreate this project:
https://learn.sparkfun.com/tutorials/us … pixels/all
With some small modifications. I’ve hooked up a WS2811 strip to 12v, and used a level shifting circuit to shift the 3v logic of the ESP32 to the 5v data input on the strip.
I couldn’t seem to get the FastLED library to work until I lifted some code from one of their examples to make it work with ESP32. I can control the whole strip, and everything seems to work - but when I use the example code to control it via ArtNET - it happens 3 pixels at a time. (for example channel 1 adjusts the Red value on the first 3 pixels of the strip and so-on)
Here is the code for my sketch as I have it now (its mostly the example code, slightly modified). I cant for the life of me figure out why its doing 3 pixels at a time instead of one - any help would be greatly appreciated:
#include <WiFi.h>
#include <WiFiUdp.h>
#include <ArtnetWifi.h>
#include "FastLED.h"
const char* ssid = "xxxxxxxx";
const char* password = "xxxxxxx";
FASTLED_USING_NAMESPACE
#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif
#define DATA_PIN 21
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS 300
int numLeds = NUM_LEDS;
CRGB leds[NUM_LEDS];
#define BRIGHTNESS 255
#define FRAMES_PER_SECOND 120
#define FASTLED_SHOW_CORE 0
// -- Task handles for use in the notifications
static TaskHandle_t FastLEDshowTaskHandle = 0;
static TaskHandle_t userTaskHandle = 0;
/** show() for ESP32
Call this function instead of FastLED.show(). It signals core 0 to issue a show,
then waits for a notification that it is done.
*/
void FastLEDshowESP32()
{
if (userTaskHandle == 0) {
// -- Store the handle of the current task, so that the show task can
// notify it when it's done
userTaskHandle = xTaskGetCurrentTaskHandle();
// -- Trigger the show task
xTaskNotifyGive(FastLEDshowTaskHandle);
// -- Wait to be notified that it's done
const TickType_t xMaxBlockTime = pdMS_TO_TICKS( 200 );
ulTaskNotifyTake(pdTRUE, xMaxBlockTime);
userTaskHandle = 0;
}
}
/** show Task
This function runs on core 0 and just waits for requests to call FastLED.show()
*/
void FastLEDshowTask(void *pvParameters)
{
// -- Run forever...
for (;;) {
// -- Wait for the trigger
ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
// -- Do the show (synchronously)
FastLED.show();
// -- Notify the calling task
xTaskNotifyGive(userTaskHandle);
}
}
// Artnet settings
ArtnetWifi artnet;
const int startUniverse = 0;
bool sendFrame = 1;
int previousDataLength = 0;
// connect to wifi – returns true if successful or false if not
boolean ConnectWifi(void)
{
boolean state = true;
int i = 0;
WiFi.begin(ssid, password);
Serial.println("");
Serial.println("Connecting to WiFi");
// Wait for connection
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
if (i > 20) {
state = false;
break;
}
i++;
}
if (state) {
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
} else {
Serial.println("");
Serial.println("Connection failed.");
}
return state;
}
void onDmxFrame(uint16_t universe, uint16_t length, uint8_t sequence, uint8_t* data)
{
sendFrame = 1;
// set brightness of the whole strip
if (universe == 15)
{
FastLED.setBrightness(data[0]);
}
// read universe and put into the right part of the display buffer
for (int i = 0; i < length / 3; i++)
{
int led = i + (universe - startUniverse) * (previousDataLength / 3);
if (led < numLeds)
{
leds[led] = CRGB(data[i * 3], data[i * 3 + 1], data[i * 3 + 2]);
}
}
previousDataLength = length;
FastLEDshowESP32();
}
void setup() {
delay(3000); // 3 second delay for recovery
Serial.begin(115200);
ConnectWifi();
artnet.begin();
// tell FastLED about the LED strip configuration
FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
artnet.setArtDmxCallback(onDmxFrame);
// set master brightness control
FastLED.setBrightness(BRIGHTNESS);
int core = xPortGetCoreID();
Serial.print("Main code running on core ");
Serial.println(core);
// -- Create the FastLED show task
xTaskCreatePinnedToCore(FastLEDshowTask, "FastLEDshowTask", 2048, NULL, 2, &FastLEDshowTaskHandle, FASTLED_SHOW_CORE);
}
int i = 0;
void loop()
{
/*
if (i >= 255) i = 0;
i++;
fill_rainbow(leds, 300, i);
FastLEDshowESP32();
*/
artnet.read();
}