Build Instructions

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• 1

  Step 1

  Arduino D2-D11 to lins 1-10 on the LED bar graph. 220 ohm resistors from opposite side of graph to ground.

  Fuel level sender Grn/Blk to 5V and Gry/Blk to Analog 0 with 10k to GND

  Low fuel LED to Digital 12 with 220 ohm resistor

• 2

  Step 2

  /*
  *LED Fuel Gauge for Honda SuperHawk 16L Tank
  *http://www.superhawkforum.com
  *Code by Will Lyon 10/3/2015. Contact: will.lyon12584@gmail.com
  *Help from user Doug Jefferies on the Element 14 Forums
  *5V to fuel sensor Grn/Blk
  *Fuel sensor Gry/Blk to Analog 0 with 10k resistor to GND
  *220 ohm resistor to each led and GND
  */
  
  const int sensorPin = A0;       // the pin that the potentiometer is attached to
  const int ledCount = 10;        // the number of LEDs in the bar graph
  const int numReadings = 35;     // use this value to determine the size of the readings array
  const int fuelPin = 12;         // pin for factory low fuel LED
  
  int ledPins[] = {
    2, 3, 4, 5, 6, 7,8,9,10,11 }; // an array of pin numbers to which LEDs are attached
  int readings[numReadings];      // the readings from the fuel level gauge
  int readIndex = 0;              // the index of the current reading
  int total = 0;                  // the running total
  int average = 0;                // the average
  int averagingCount = 0;         // checks the number of values in the Index
  int timer = 75;                 // timer for inital LED sweep
  int pinCount = 10;              // number of LED pins
  
  void setup() {
    Serial.begin(9600);
    pinMode(fuelPin, OUTPUT);
    digitalWrite(fuelPin, LOW);
    for (int thisLed = 0; thisLed < ledCount; thisLed++) {      // loop over the pin array and set them all to output
      pinMode(ledPins[thisLed], OUTPUT);
    }
    for (int thisReading = 0; thisReading < numReadings;        // initialize all readings to zero
    thisReading++) {
    readings[thisReading] = 0;
    }
    for (int thisPin = 0; thisPin < pinCount; thisPin++) {      // loop from the lowest pin to the highest
      digitalWrite(ledPins[thisPin], HIGH);                     // turn the pin on
      delay(timer);                                             // delay for time set bove
      digitalWrite(ledPins[thisPin], LOW);                      // turn the pin off
    }
    for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { // loop from the highest pin to the lowest
      digitalWrite(ledPins[thisPin], HIGH);                     // turn the pin on
      delay(timer);                                             // delay for time set above
      digitalWrite(ledPins[thisPin], LOW);                      // turn the pin off
    }
  }
  
  void loop() {
    total = total - readings[readIndex];                    // subtract the last reading
    readings[readIndex] = analogRead(sensorPin);            // read from the sensor
    total = total + readings[readIndex];                    // add the reading to the total
    readIndex = readIndex + 1;                              // advance to the next position in the array
    if (readIndex >= numReadings) {                         // if we're at the end of the array
      readIndex = 0;                                        // wrap around to the beginning
    }
    averagingCount = averagingCount + 1;                    // increments the count for averaging
    if (averagingCount >= numReadings) {                    // caps the averaging count to the array
      averagingCount = numReadings;                           
    }
    average = total / averagingCount;                       // calculate the average
    delay(3000);                                            // delay in between readings so the gauge doesn't fluctuate too fast
    average = map(average, 585, 940, 0, ledCount);          // map the result to a range from 0 to the number of LEDs:
    for (int thisLed = 0; thisLed < ledCount; thisLed++) {  // loop over the LED array
      if (thisLed == average-1) {                           // if the array element's index is less than ledLevel
        digitalWrite(ledPins[thisLed], HIGH);               // turn the pin for this element on:
      }
      else {
        digitalWrite(ledPins[thisLed], LOW);                // turn off all pins higher than the ledLevel:
      }
    }
    if (average <= 2) {                                     // if either of the last two LED's on the display are lit
      digitalWrite(fuelPin, HIGH);                          // turn on the low fuel LED
    }
    else {
      digitalWrite(fuelPin, LOW);                           // turn the low fuel LED off
    }
    Serial.println(analogRead(sensorPin));
    delay(100);
  }

  
  

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