Step Sequence - NeoKeys 1x4 Modules

Projects General Guidance
1

Hi All,

I am currently stuck with my code to create a simple flashing LED step sequence that loops around using 4 x NeoKey 1x4 Modules chained together, with a separate module for controlling the start and stop.

My wiring and I2C communication is working correctly and no issues with power. I am using a teensy 4.1 board.

So far it works but the LEDs for the modules all play together at the same time, what I want to achieve is when I press play it plays the LEDs in sequence from module 1 (leds 0,1,2,3) and module 2 (leds 4,5,6,7) and so on until it reaches the end and loops back around again.

#include "Adafruit_NeoKey_1x4.h"
#include "seesaw_neopixel.h"

// Create an array of NeoKey objects for each module
Adafruit_NeoKey_1x4 neokeys[] = {
  Adafruit_NeoKey_1x4(), // Control module (0x38)
  Adafruit_NeoKey_1x4(), // First LED sequence module (0x30)
  Adafruit_NeoKey_1x4(), // Second LED sequence module (0x31)
  Adafruit_NeoKey_1x4(), // Third LED sequence module (0x32)
  Adafruit_NeoKey_1x4()  // Fourth LED sequence module (0x34)
};

const uint8_t numModules = sizeof(neokeys) / sizeof(neokeys[0]);

// Control buttons (for 0x38 address)
const uint8_t playButton = 0;   // Play button
const uint8_t stopButton = 1;   // Stop button

bool sequenceRunning = false;
unsigned long lastMillis = 0;
unsigned long ledDelay = 110;  // Delay between LED flashes in ms
int currentLed = 0;           // Keeps track of the current LED being lit

bool lastPlayState = false;
bool lastStopState = false;

void setup() {
  Serial.begin(115200);
  
  // Initialize each NeoKey module with the appropriate I2C address
  if (!neokeys[0].begin(0x38)) {  // Control module
    Serial.println("Could not start NeoKey 1, check wiring?");
    while(1) delay(10);
  }

  if (!neokeys[1].begin(0x30)) {  // LED sequence module 1
    Serial.println("Could not start NeoKey 2, check wiring?");
    while(1) delay(10);
  }

  if (!neokeys[2].begin(0x31)) {  // LED sequence module 2
    Serial.println("Could not start NeoKey 3, check wiring?");
    while(1) delay(10);
  }

  if (!neokeys[3].begin(0x32)) {  // LED sequence module 3
    Serial.println("Could not start NeoKey 4, check wiring?");
    while(1) delay(10);
  }

  if (!neokeys[4].begin(0x34)) {  // LED sequence module 4
    Serial.println("Could not start NeoKey 5, check wiring?");
    while(1) delay(10);
  }

  Serial.println("All NeoKey modules started!");

  // Turn off all LEDs at the beginning
  for (uint8_t j = 0; j < numModules; j++) {
    for (uint16_t i = 0; i < neokeys[j].pixels.numPixels(); i++) {
      neokeys[j].pixels.setPixelColor(i, 0x000000);
      neokeys[j].pixels.show();
    }
  }
}

void loop() {
  // Control module (0x38): Check buttons for play and stop
  uint8_t controlKey = neokeys[0].read();  // Read control module keys

  // Check for play button press
  bool currentPlayState = controlKey & (1 << playButton);
  if (currentPlayState && !lastPlayState) {
    Serial.println("Sequence started");
    sequenceRunning = true;
    currentLed = 0;  // Reset to the first LED in the sequence
  }
  lastPlayState = currentPlayState;

  // Check for stop button press
  bool currentStopState = controlKey & (1 << stopButton);
  if (currentStopState && !lastStopState) {
    Serial.println("Sequence stopped");
    sequenceRunning = false;
  }
  lastStopState = currentStopState;

  // If the sequence is running, execute the LED sequence
  if (sequenceRunning) {
    unsigned long currentMillis = millis();
    if (currentMillis - lastMillis >= ledDelay) {
      lastMillis = currentMillis;
      runSequence();
    }
  }
}

// LED sequence function
void runSequence() {
  // Loop through all NeoKey modules except the control module
  for (uint8_t j = 1; j < numModules; j++) {  // Start from 1 to skip the control module
    // Loop through LEDs on each NeoKey module
    for (int i = 0; i < neokeys[j].pixels.numPixels(); i++) {
      // Check if the current LED is the one being activated
      if (i == currentLed) {
        neokeys[j].pixels.setPixelColor(i, neokeys[j].pixels.Color(255, 0, 0)); // Red color
      } else {
        neokeys[j].pixels.setPixelColor(i, 0x000000); // Turn off the other LEDs
      }
    }
    neokeys[j].pixels.show(); // Update the LEDs
  }

  // Move to the next LED
  currentLed++;

  // If we've gone through all LEDs, reset to the first LED
  if (currentLed >= 16) {
    currentLed = 0;
  }
}

Any help would be appreciated and excuse the bulky code, I am a novice.

Thanks,
David

2

Okey. What is the current outcome? What's not happening as You wish?

3

Here's an example from the "seesaw" library. Maybe comparing it to your sketch will help.

4

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