8x8 LED 矩阵和按钮

Question

I have written some code in order to display arrows for a turn signal. I'm trying to implement a two push button system that decides which directional arrow to display. I have two problems.

1. 8x8 LED matrix starts off by being turned on and I can't figure out why.

2. When I press the left Push Button it stops the arrow.

I didn't include the code where the LED draws the arrows because it only contains arrays filled with each frame rate.

#include "LedControl.h"

/*the last is how many matrices you have connected (dataPin, clockPin, 
csPin, numberDevices) */
LedControl lc = LedControl(12, 11, 10, 1);
int lButton = 2, rButton = 3, lButtonState = 0, rButtonState = 0;


void setup() {
    pinMode(lButton, INPUT);
    pinMode(rButton, INPUT);
}


void leftArrow(){
    //in setup everything is done once
    /*
    The MAX7219 is in power-saving mode on startup,
    we have to do a wakeup call
    */
    lc.shutdown(0, false);
    // Set the brightness to a medium value
    lc.setIntensity(0, 8);
    // and clear the display
    lc.clearDisplay(0);
}

void loop() {
    lButtonState = digitalRead(lButton);
    if (lButtonState == HIGH)
        leftArrow();
}

Answer 1

1_Check your circuit connections. They probably have problem on data or CLK pins

2_To solve the problem of arrows in void loop() You must also add else If not pressed, it will show something else or turn off or whatever...

void loop(){
    lButtonState = digitalRead(lButton);
    rButtonState = digitalRead(rButton);
    if (lButtonState == HIGH){
       leftArrow();
    }
    else if (rButtonState == HIGH){
       rightArrow();
    }
    else {
      lc.clearDisplay(0);
    }