I admit that I am way over my head. I have a project that I need to add a single addressable WS2812B LED to. I am using a Sparkfun "LED - RGB Addressable, PTH, 5mm Diffused". The attached schematic is the way I wired it, with 2 exceptions: i put a 1/4 watt 470ohm resistor on the data in line, and a 0.1 μF capacitor between each WS2812 LED's VDD and GND. I am powering the Uno with only the USB power. I used the attached code from Sparkfun . . . and I get nothing. The menu presents itself, requests the device to be tested, then it goes off and runs with no visible activity or lights on the LED.
Any help would be greatly appreciated. I have to think it is something simple that I just don't understand.
// Include Libraries
#include "Arduino.h"
#include "Adafruit_NeoPixel.h"
// Pin Definitions
#define LEDRGB_PIN_DIN 2
// Global variables and defines
#define LedRGB_NUMOFLEDS 1
// object initialization
Adafruit_NeoPixel LedRGB(LEDRGB_PIN_DIN);
// define vars for testing menu
const int timeout = 10000; //define timeout of 10 sec
char menuOption = 0;
long time0;
// Setup the essentials for your circuit to work. It runs first every time your circuit is powered with electricity.
void setup()
{
// Setup Serial which is useful for debugging
// Use the Serial Monitor to view printed messages
Serial.begin(9600);
while (!Serial) ; // wait for serial port to connect. Needed for native USB
Serial.println("start");
LedRGB.begin(); // This initializes the NeoPixel library.
LedRGB.show(); // Initialize all leds to 'off'
menuOption = menu();
}
// Main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop.
void loop()
{
if(menuOption == '1') {
// LED - RGB Addressable, PTH, 5mm Diffused (5 Pack) - Test Code
for(int i=0 ; i <= LedRGB_NUMOFLEDS ; i++){
for (int k = 0 ; k <= 255 ; k++) {
// set leds Color to RGB values, from 0,0,0 up to 255,255,255
LedRGB.setPixelColor(i, LedRGB.Color(255-k,k,100)); // turn on green color on led #i.
if (i > 0)
LedRGB.setPixelColor(i-1, LedRGB.Color(0,0,0)); // turn off last led
LedRGB.show(); //update led color to the hardware.
delay(1);
}
}
}
if (millis() - time0 > timeout)
{
menuOption = menu();
}
}
// Menu function for selecting the components to be tested
// Follow serial monitor for instrcutions
char menu()
{
Serial.println(F("\nWhich component would you like to test?"));
Serial.println(F("(1) LED - RGB Addressable, PTH, 5mm Diffused (5 Pack)"));
Serial.println(F("(menu) send anything else or press on board reset button\n"));
while (!Serial.available());
// Read data from serial monitor if received
while (Serial.available())
{
char c = Serial.read();
if (isAlphaNumeric(c))
{
if(c == '1')
Serial.println(F("Now Testing LED - RGB Addressable, PTH, 5mm Diffused (5 Pack)"));
else
{
Serial.println(F("illegal input!"));
return 0;
}
time0 = millis();
return c;
}
}
}
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