button problem

Projects Programming
1

Here is the situation:
3 buttons(a,b,c)
3 leds(1,2,3)
leds random high,
if a&1 high, 1 keeps high for a while(stop random),
if b&2 high, 2 keeps high for a while(stop random),
if c&3 high, 3 keeps high for a while(stop random)

Question is:
how can I press the button once but not hold down to make this work.

const int ledPin1= 7;
const int ledPin2= 8;
const int ledPin3= 9;

const int butPin1= 4;
const int butPin2= 5;
const int butPin3= 6;
int butState1 = 0;
int butState2 = 0;
int butState3 = 0; 
int valueRand;
int vetor[]={ledPin1, ledPin2, ledPin3};
int potValue;
void setup(){
  Serial.begin(2400);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  
  pinMode(butPin1, INPUT);
  pinMode(butPin2, INPUT);
  pinMode(butPin3, INPUT);
}
void loop(){
  potValue=800;
  valueRand =random(0,3);

  butState1 = digitalRead(butPin1);
  butState2 = digitalRead(butPin2);
  butState3 = digitalRead(butPin3);
  
 if((valueRand==0) && (butState1==HIGH)){
   potValue=4000;
 }else
 if((valueRand==1) && (butState2==HIGH)){
     potValue=4000;
 }else
 if((valueRand==2)&& (butState3==HIGH)){
     potValue=4000;
}

   digitalWrite(vetor[valueRand],HIGH);
delay(potValue);
   digitalWrite(vetor[valueRand],LOW);
 
 Serial.print(butState1);
 Serial.println(potValue);
}
2

You have pulldown resistors on the button pins so they read as Low when not pressed?
I would think that Loop would cycle thru so fast that if valueRand had the right number even occasionally you would get a match when the button was pressed and then just as quickly not match. Is that what you are seeing?
So when the button is pressed you see a sort of half-lit, flickery LED?

You could a delay(500);
after a successful match so the LED stays on for 1/2 second:

Add an additional test at the end:
if (potValue == 4000){ // so if saw a match with valueRand && butPinx
digitalWrite(vetor[valueRand],HIGH);
delay (potValue);
}

3

leds are quite instand to random HIGH.
For problem, when it has matched(led1&&button1==HIGH)(press once), the check result expressed it has not!(Serial.println)

It works when I hold down the button for a while but it is not my expectation!
(the button I used is the same model to the attachment)

41840.jpg