Hi, I'd be really appreciative of some help! I am trying to control the brightness of my Neopixel with a HC-SRO4 Ultrasonic sensor and so far my code works but quite clunkily. The transition of the brightness is not smooth and at some points the light even temporarily cuts out. Can anyone please help me get a smoother transition?
Here is my code:
#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04
// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement
int brightness; //variable for the brightness measurement
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
#define PIN 6
#define NUMPIXELS 7
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800); //Determines the number of LEDs and Arduino pins.
#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
Serial.begin(9600); // Serial Communication is starting with 9600 of baudrate speed
pixels.begin();//Does the initialisations.
}
void loop() {
// Clears the trigPin condition
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin HIGH (ACTIVE) for 10 microseconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
pixels.clear();
pixels.setPixelColor(0, pixels.Color(253, 244, 200)); //Defines the LEDs color with the RGB system, after specifying the LED number (from 0 to NUMPIXELS-1).
pixels.setPixelColor(1, pixels.Color(253, 244, 200));
pixels.setPixelColor(2, pixels.Color(253, 244, 200));
pixels.setPixelColor(3, pixels.Color(253, 244, 200));
pixels.setPixelColor(4, pixels.Color(253, 244, 200));
pixels.setPixelColor(5, pixels.Color(253, 244, 200));
pixels.setPixelColor(6, pixels.Color(253, 244, 200));
if(distance <= 20) {
brightness = map(distance, 0, 20, 255, 1);
pixels.setBrightness(brightness);
delay(100);
}
else {
pixels.setBrightness(0);
delay(100);
}
pixels.show(); //Displays the applied values.
// Displays the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.print(distance);
Serial.print(" cm ");
Serial.print("Brightness: ");
Serial.println(brightness);
}
#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04
// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement
int brightness; //variable for the brightness measurement
int lastBrightness;
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif
#define PIN 6
#define NUMPIXELS 7
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800); //Determines the number of LEDs and Arduino pins.
#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels
//---------------------------------------------------------------------
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
Serial.begin(9600); // Serial Communication is starting with 9600 of baudrate speed
pixels.begin();//Does the initialisations.
}
//---------------------------------------------------------------------
void loop() {
digitalWrite(trigPin, LOW); // Clears the trigPin condition
delayMicroseconds(2);
digitalWrite(trigPin, HIGH); // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH); // Reads the echoPin, returns the sound wave travel time in microseconds
// Calculating the distance
distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
pixels.clear();
pixels.setPixelColor(0, pixels.Color(253, 244, 200)); //Defines the LEDs color with the RGB system, after specifying the LED number (from 0 to NUMPIXELS-1).
pixels.setPixelColor(1, pixels.Color(253, 244, 200));
pixels.setPixelColor(2, pixels.Color(253, 244, 200));
pixels.setPixelColor(3, pixels.Color(253, 244, 200));
pixels.setPixelColor(4, pixels.Color(253, 244, 200));
pixels.setPixelColor(5, pixels.Color(253, 244, 200));
pixels.setPixelColor(6, pixels.Color(253, 244, 200));
if (distance <= 20) {
brightness = map(distance, 0, 20, 255, 1);
brightness = (brightness + lastBrightness) / 2;
lastBrightness = brightness;
}
else {
brightness = (brightness - lastBrightness) / 2;
if (brightness < 0)
brightness = 0;
lastBrightness = brightness;
}
pixels.setBrightness(brightness);
//delay(100);
pixels.show(); //Displays the applied values.
Serial.print("Distance: "); // Displays the distance on the Serial Monitor
Serial.print(distance);
Serial.print(" cm ");
Serial.print("Brightness: ");
Serial.println(brightness);
}
Thanks everyone for the replies, I really appreciate it! The values were fine, I realised that there was not a delay between each distance reading and so added one and now it works great!
