user95613

Most recent activity

• Ultrasonic sensor and ledstrip color problem

  @user95613 started

  • 5 comments
  • 3,370 views

  @Gordon replied
• Ultrasonic sensor and ledstrip color problem

  in Electronics • 6 years, 1 month

  

  I'm using the Arduino Uno

• Ultrasonic sensor and ledstrip color problem

  in Electronics • 6 years, 1 month

  

  So I've made a parking sensor with the Ultrasonic sensor and a ledstrip. But the ledstrip doesn't turn yellow or green. I think it has to do with the Thresholds. Can anyone help me to set this up? I also want a longer distance greater than 1 meter. This is my code:

  [#include](https://forum.espruino.com/search/?q=%23include) "FastLED.h"
   [#include](https://forum.espruino.com/search/?q=%23include) <math.h>
  
  
      [#define](https://forum.espruino.com/search/?q=%23define) NUM_LEDS 32
      [#define](https://forum.espruino.com/search/?q=%23define) BRIGHTNESS 10
      [#define](https://forum.espruino.com/search/?q=%23define) DATA_PIN 4
  
      // Define the array of leds
      CRGB leds[NUM_LEDS];
  
      // Module Pins
      [#define](https://forum.espruino.com/search/?q=%23define) trigPin 11
      [#define](https://forum.espruino.com/search/?q=%23define) echoPin 12
  
  
      // Thresholds (in CM)
      long SECTION_SIZE = 80;
      long STOP_DISTANCE = 60;
      long WARNING_THRESHOLD = 50;
      long MAX_THRESHOLD = 375;
  
      long RED_THRESHOLD = STOP_DISTANCE;
      long YELLOW_THRESHOLD = RED_THRESHOLD + SECTION_SIZE;
      long GREEN_THRESHOLD = YELLOW_THRESHOLD + SECTION_SIZE;
  
      const int numReadings = 5;
  
      int readings[numReadings];      // the readings from the analog input
      int readIndex = 0;              // the index of the current reading
      int total = 0;                  // the running total
      int average = 0;                // the average
  
      void setup() {
        Serial.begin (9600);
  
  
        FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
        FastLED.setBrightness(10);
  
        // HC-SR04 Setup
        pinMode(trigPin, OUTPUT);
        pinMode(echoPin, INPUT);
  
        // initialize all the readings to 0:
        for (int thisReading = 0; thisReading < numReadings; thisReading++) {
          readings[thisReading] = 0;
        }
      }
  
      void loop() {
        long distance, lastRun;
        bool red, yellow, green;
        total = total - readings[readIndex];
        readings[readIndex] = calculateDistance();
        total = total + readings[readIndex];
  
        readIndex++;
        if (readIndex >= numReadings) readIndex = 0;
  
        distance = abs(total / numReadings);
  
        yellow = distance <= YELLOW_THRESHOLD && distance > RED_THRESHOLD;
        red = distance <= RED_THRESHOLD;
        green = distance > YELLOW_THRESHOLD && distance <= GREEN_THRESHOLD;
  
        if (red) {
          setRed();
        } else if (yellow) {
          setYellow(distance);
        } else if (green) {
          setGreen(distance);
        } else {
          setGreenStandby();
        }
  
  
  
        Serial.print(distance);
        Serial.println(" cm");
        FastLED.show();
        delay(1);
      }
  
      void lightItUp(const CRGB& pColor, const CRGB& sColor, uint16_t travel) {
        uint16_t travelFix = travel * (NUM_LEDS/SECTION_SIZE);
        uint16_t leftStop = travelFix/2;
        uint16_t rightStop = NUM_LEDS - leftStop;
        for (int i = 0; i < NUM_LEDS; i++) {
          if (i < leftStop || i > rightStop) {
            leds[i] = pColor;
          } else {
            leds[i] = sColor;
          }
        }
  
        FastLED.show();
      }
  
  
      long calculateDistance() {
        long duration;
        digitalWrite(trigPin, LOW);
        delayMicroseconds(2);
        digitalWrite(trigPin, HIGH);
        delayMicroseconds(10);
        digitalWrite(trigPin, LOW);
  
        duration = pulseIn(echoPin, HIGH);
        return (duration/2) / 29.1;
      }
  
      void setGreenStandby() {
        return fill_solid(leds, NUM_LEDS, CRGB::Black);
      }
  
      void setRed() {
        return fill_solid(leds, NUM_LEDS, CRGB::Red);
      }
  
      void setGreen(long distance) {
        long travel = GREEN_THRESHOLD - distance;
        return lightItUp(CRGB::Yellow, CRGB::Green, travel);
      }
  
      void setYellow(long distance) {
        long travel = YELLOW_THRESHOLD - distance;
        return lightItUp(CRGB::Red, CRGB::Yellow, travel);  
      }