Missing or Incorrect Airport Code

Oct 13, 2025 by vinooalluri.com 93 views

Introduction

The MVFR (Visual Flight Rules) key LED is a crucial component of a weather display system, indicating the current weather conditions at various airports. However, in this case, the MVFR key LED is not lighting up, despite all other LEDs functioning correctly. This article will investigate the possible causes of this issue and provide a step-by-step solution to resolve the problem.

Understanding the Code

The code provided is written in C++ and uses the ESP8266 WiFi module and the FastLED library to control a series of LEDs. The code is designed to retrieve weather data from the aviationweather.gov server and display it on the LEDs. The MVFR key LED is part of a sequence of LEDs that display the weather conditions at various airports.

Identifying the Issue

The issue with the MVFR key LED not lighting up can be attributed to several possible causes:

Incorrect Airport Order: The order of airports in the airports vector may be incorrect, causing the MVFR key LED to be assigned a different airport code.
Missing or Incorrect Airport Code: The airport code for the MVFR key LED may be missing or incorrect, preventing the LED from lighting up.
Incorrect Condition Mapping: The condition mapping in the doColor function may be incorrect, causing the MVFR key LED to be assigned a different color.

Step-by-Step Solution

To resolve the issue with the MVFR key LED not lighting up, follow these steps:

Step 1: Verify the Airport Order

Verify that the airport order in the airports vector is correct. The order should be:

VFR
WVFR
MVFR
IFR
LIFR

If the order is incorrect, correct it to ensure that the MVFR key LED is assigned the correct airport code.

Step 2: Verify the Airport Code

Verify that the airport code for the MVFR key LED is correct. The airport code should be "MVFR". If the code is missing or incorrect, correct it to ensure that the LED is assigned the correct code.

Step 3: Verify the Condition Mapping

Verify that the condition mapping in the doColor function is correct. The condition mapping should be:

LIFR: Magenta
IFR: Red
MVFR: Blue
VFR: Green (with yellow if wind speed is above the threshold)

If the condition mapping is incorrect, correct it to ensure that the MVFR key LED is assigned the correct color.

Conclusion

The MVFR key LED is not lighting up due to an incorrect airport order, missing or incorrect airport code, or incorrect condition mapping. By following the step-by-step solution outlined above, you can resolve the issue and ensure that the MVFR key LED lights up correctly.

Code Modifications

To implement the solution, modify the airports vector to ensure that the MVFR key LED is assigned the correct airport code. Additionally, modify the doColor function to ensure that the condition mapping is correct.

std::vector<String> airports({
  "KFSM", // 1 order of LEDs, starting with 1 should be KFSM; use VFR, WVFR, MVFR, IFR, LIFR for key; NULL for no airport
  "NULL", // 2
  "NULL", // 3
  "KGZL", // 4
  "KJSV", // 5
  "NULL", // 6
  "WVFR", // 7
  "LIFR", // 8
  "IFR", // 9
  "MVFR", // 10
  "VFR", // 11
  "NULL", // 12
  "KFYV", // 13
  "KASG", // 14
  "KROG", // 15
  "KVBT", // 16
  "KXNA", // 17
  "KSLG", // 18
  "NULL", // 19
  "KGMJ", // 20
  "NULL", // 21
  "NULL", // 22
  "KJLN", // 23
  "NULL", // 24
  "NULL", // 25
  "1K8", // 26
  "NULL", // 27
  "NULL", // 28
  "KTQH", // 29
  "NULL", // 30
  "KMKO", // 31
  "NULL", // 32
  "H71", // 33
  "KGCM", // 34
  "NULL", // 35
  "NULL", // 36
  "KCFV", // 37
  "KIDP", // 38
  "NULL", // 39
  "KBVO", // 40
  "NULL", // 41
  "KTUL", // 42
  "KOWP", // 43
  "KRVS", // 44
  "NULL", // 45
  "KOKM", // 46
  "NULL", // 47
  "NULL", // 48
  "KSRE", // 49
  "KSNL", // 50
  "KCQB", // 51
  "KCUH", // 52
  "NULL", // 53
  "KSWO", // 54
  "NULL", // 55
  "KPNC", // 56
  "NULL", // 57
  "KWLD", // 58
  "NULL", // 59
  "KBKN", // 60
  "NULL", // 61
  "NULL", // 62
  "KWDG", // 63
  "KEND", // 64
  "NULL", // 65
  "NULL", // 66
  "KGOK", // 67
  "NULL", // 68
  "KTIK", // 69
  "KOUN", // 70
  "KOKC", // 71
  "KPWA", // 72
  "KHSD", // 73
  "KRCE", // 74
  "KRQO", // 75
  "NULL", // 76
  "KCHK", // 77
  "NULL", // 78
  "NULL", // 79
  "NULL" // 80
});

void doColor(String identifier, unsigned short int led, int wind, int gusts, String condition, String wxstring) {
  CRGB color;
  Serial.print(identifier);
  Serial.print(": ");
  Serial.print(condition);
  Serial.print(" ");
  Serial.print(wind);
  Serial.print("G");
  Serial.print(gusts);
  Serial.print("kts LED ");
  Serial.print(led);
  Serial.print(" WX: ");
  Serial.println(wxstring);
  if (wxstring.indexOf("TS") != -1) {
    Serial.println("... found lightning!");
    lightningLeds.push_back(led);
  }
  if (condition == "LIFR") color = CRGB::Magenta;
  else if (condition == "IFR") color = CRGB::Red;
  else if (condition == "MVFR") color = CRGB::Blue;
  else if (condition == "VFR") {
    if ((wind > WIND_THRESHOLD || gusts > WIND_THRESHOLD) && DO_WINDS) {
      color = CRGB::Yellow;
    } else {
      color = CRGB::Green;
    }
  } else color = CRGB::Black;

  leds[led] = color;
}

By implementing these modifications, you can ensure that the MVFR key LED lights up correctly and displays the correct weather conditions.
MVFR Key LED is not Lighting Up: Q&A

Q: What is the MVFR key LED?

A: The MVFR key LED is a crucial component of a weather display system, indicating the current weather conditions at various airports. It is part of a sequence of LEDs that display the weather conditions at different airports.

Q: Why is the MVFR key LED not lighting up?

A: The MVFR key LED may not be lighting up due to an incorrect airport order, missing or incorrect airport code, or incorrect condition mapping.

Q: How do I verify the airport order?

A: To verify the airport order, check the airports vector in the code. The order should be:

VFR
WVFR
MVFR
IFR
LIFR

If the order is incorrect, correct it to ensure that the MVFR key LED is assigned the correct airport code.

Q: How do I verify the airport code?

A: To verify the airport code, check the airports vector in the code. The airport code for the MVFR key LED should be "MVFR". If the code is missing or incorrect, correct it to ensure that the LED is assigned the correct code.

Q: How do I verify the condition mapping?

A: To verify the condition mapping, check the doColor function in the code. The condition mapping should be:

LIFR: Magenta
IFR: Red
MVFR: Blue
VFR: Green (with yellow if wind speed is above the threshold)

If the condition mapping is incorrect, correct it to ensure that the MVFR key LED is assigned the correct color.

Q: What are the possible causes of the MVFR key LED not lighting up?

A: The possible causes of the MVFR key LED not lighting up are:

Incorrect airport order
Missing or incorrect airport code
Incorrect condition mapping

Q: How do I resolve the issue with the MVFR key LED not lighting up?

A: To resolve the issue with the MVFR key LED not lighting up, follow these steps:

Verify the airport order in the airports vector.
Verify the airport code for the MVFR key LED.
Verify the condition mapping in the doColor function.

By following these steps, you can ensure that the MVFR key LED lights up correctly and displays the correct weather conditions.

Q: What are the benefits of resolving the issue with the MVFR key LED not lighting up?

A: Resolving the issue with the MVFR key LED not lighting up has several benefits, including:

Accurate display of weather conditions
Improved user experience
Enhanced reliability of the weather display system

By resolving the issue with the MVFR key LED not lighting up, you can ensure that the weather display system is accurate, reliable, and provides a good user experience.