Programming for Arduino Uno

Projects General Guidance
69

I have an ugly way. Add this line just before the closing brace.

  while(1); // remain here forever

This is the complete code.

#include <Adafruit_NeoPixel.h>

#define PIN_NEO_PIXEL  4   // Arduino pin that connects to NeoPixel
#define NUM_PIXELS     78  // The number of LEDs (pixels) on NeoPixel
#define DELAY_INTERVAL 50

Adafruit_NeoPixel NeoPixel(NUM_PIXELS, PIN_NEO_PIXEL, NEO_GRB + NEO_KHZ800);

void setup() {
  NeoPixel.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
  NeoPixel.clear(); // set all pixel colors to 'off'. It only takes effect if pixels.show() is called
  NeoPixel.show();
}

void loop() {
  // turn pixels to white one by one with delay between each pixel
  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) { // for each pixel
    NeoPixel.setPixelColor(pixel, NeoPixel.Color(255, 255, 255)); // it only takes effect if pixels.show() is called
    NeoPixel.show();   // send the updated pixel colors to the NeoPixel hardware.
    delay(DELAY_INTERVAL); // pause between each pixel
  }
  while (1); // remain here forever
}
70

I used the code from Post #45 (when I stumbled into the thread) and made a WOKWI. I did not compare.

71

I will need to wait till I can get back into the garage (less heat) to check out this new code.
but I think it looks good!
thanks!

72

it being Sunday, I don't know when you might be able to reply, but I will post and wait.
I hooked up the board in the garage and it kept giving me an error message, saying that //./COM4 couldn't be found, but it also said (at the bottom of the screen) that Arduino Uno was on COM4 (connected).
so I brought that computer inside and hooked it up again (using the same cable) and it worked (sort of).
it would indeed go to the end of the pixels (relative) then stop. but then it would disconnect from the computer for a second, then reconnect and restart the whole program. when I took out the 'while(1);', then it would go only 40 pixels and restart (when I had in the program it was 100 pixels)
weird weird weird.............

73

This is your brown-out condition. You are not supplying enough power to the Arduino, or drawing too much power from the Arduino or both.

Not true...

74

after my last post, I did get it to work as I wanted.

that was my original guess of how many pixels I would need - it is actually 72.

oddly enough, at one time it did work with only the power from the computer! I am currently recharging my batteries to see if that makes any difference.

75

however, it is very inconsistent. sometimes works just fine and sometimes it don't light at all.

76

Power or device issue. Your code works.

77

so, I just figured out that what I was doing to simulate what would be off and on for the circuit wasn't (apparently) how I should do it. I was disconnecting the LED strip from the Arduino. what I need to do is disconnect the power from the Arduino. after all, that is what my switch will be doing.
doing it that way has now given me many repeated times that it works correctly!