The strip is connected to an Uno (5V) and a color sensor, I've checked both the code and connections and have tried a few different changes but it only seems to light just 1 LED at the start and it complies and uploads perfectly. though i know they all light up becuase ive tested the supplied example code so im not sure how to go about it.
Anyone have any Ideas?
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#define LED_PIN 3
#define LED_COUNT 120
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
int delayval = 333; // delay
#define S0 4
#define S1 5
#define S2 6
#define S3 7
#define sensorOut 8
int frequency = 0;
int Red, Green, Blue;
void setup() {
pinMode(S0, OUTPUT);
pinMode(S1, OUTPUT);
pinMode(S2, OUTPUT);
pinMode(S3, OUTPUT);
pinMode(sensorOut, INPUT);
// Setting frequency-scaling to 20%
digitalWrite(S0,HIGH);
digitalWrite(S1,LOW);
strip.begin(); //always needed
strip.show(); // 0 data => off.
}
void loop() {
// Setting red filtered photodiodes to be read
digitalWrite(S2,LOW);
digitalWrite(S3,LOW);
// Reading the output frequency
frequency = pulseIn(sensorOut, LOW);
//Remaping the value of the frequency to the RGB Model of 0 to 255
frequency = map(frequency, 25,72,255,0);
if (frequency < 0) {
frequency = 0;
}
if (frequency > 255) {
frequency = 255;
}
Red= frequency;
// Printing the value on the serial monitor
Serial.print("R= ");//printing name
Serial.print(frequency);//printing RED color frequency
Serial.print(" ");
// Setting Green filtered photodiodes to be read
digitalWrite(S2,HIGH);
digitalWrite(S3,HIGH);
// Reading the output frequency
frequency = pulseIn(sensorOut, LOW);
//Remaping the value of the frequency to the RGB Model of 0 to 255
frequency = map(frequency, 30,90,255,0);
if (frequency < 0) {
frequency = 0;
}
if (frequency > 255) {
frequency = 255;
}
Green = frequency;
// Printing the value on the serial monitor
Serial.print("G= ");//printing name
Serial.print(frequency);//printing RED color frequency
Serial.print(" ");
// Setting Blue filtered photodiodes to be read
digitalWrite(S2,LOW);
digitalWrite(S3,HIGH);
// Reading the output frequency
frequency = pulseIn(sensorOut, LOW);
//Remaping the value of the frequency to the RGB Model of 0 to 255
frequency = map(frequency, 25,70,255,0);
if (frequency < 0) {
frequency = 0;
}
if (frequency > 255) {
frequency = 255;
}
Blue = frequency;
// Printing the value on the serial monitor
Serial.print("B= ");//printing name
Serial.print(frequency);//printing RED color frequency
Serial.println(" ");
strip.setPixelColor(0, strip.Color(Red,Green,Blue)); // Moderately bright green color.
strip.setBrightness(255);
strip.show(); // This sends the updated pixel color to the hardware.
}
===
Can you please edit your opening post, select all code and click in the toolbar ; next save your post. As a result it will show in a scrolling window and will have a copy button. It also prevents mangling of your code by forum software and ” is replaced by a normal " so we don't have to fix code before we can compile it.
// set the colour of all pixels
for(uint8_t ledCnt=0;ledCnt<LED_COUNT;cnt++
{
strip.setPixelColor(ledCnt, strip.Color(Red,Green,Blue));
}
// set the strip brightness
strip.setBrightness(255);
// update the strip; this does the `physical' transfer of the data (that you have just set) to the strip
strip.show();
That is probably caused by power issue. How are you powering the strip ? for 120 leds you will need an external 5v power supply.
Even when using a 5v power supply, it is probably a good idea to add a sizeable capacitor on the 5v rail.
Of course you need a power supply for the LEDs. What does "external" mean?
If you had just 8 LEDs, you might be able for testing purposes, connect them to the "5V" pin of the Arduino while it was powered by the USB port, but that cannot be called "power supply" as such.
For 120 LEDs you require a (120 x 0.055) 7 Amp power supply. Basically, a 10 Amp supply to give some "headroom".
Powers coming stright from the Arduino 5v pin, ive used the example code the strip came with and the leds seem to work full brightness without flashing. unless something in the code is causing it.
copied as is from the website but i had changed the brightness to 255
#include <Adafruit_NeoPixel.h>
#define LED_PIN 6
#define LED_COUNT 120
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
void setup() {
strip.begin(); //always needed
strip.show(); // 0 data => off.
strip.setBrightness(50); // ~20% (max = 255)
}
void loop() {
int n = strip.numPixels();
// fph = FirstPixelHue
for (long fph = 0; fph < 5 * 65536; fph += 256)
{
for (int i = 0; i < n; i++)
{
int pixelHue = fph + (i * 65536L / n);
strip.setPixelColor(i,
strip.gamma32(strip.ColorHSV(pixelHue))
);
}
strip.show();
delay(10);
}
}
Generally people working with LED's seem to think they can get away with :
'external' is just to emphasize not to use the USB power.
Well the ratings vary a little and most strips use a lot less than specified, even if they are on white & full-brightness, but yes, i'd rather be safe than sorry, though most USB ports provide nearly 1amp (but are rated for 500mA) and have a over-current auto shut-off, or just don't provide more, but i would rather be safe than sorry.
in the toolbar ; next save your post. As a result it will show in a scrolling window and will have a copy button. It also prevents mangling of your code by forum software and ” is replaced by a normal " so we don't have to fix code before we can compile it.
