I designed an button-activated GO! signal. The design was inspired by NASCAR's countdown lights which signal the start of a race.
The display either turns on the green LEDs sequentially or blinks the red LEDs. It is made up of an ItsyBitsy M4 (SAMD51) board along with jumper calbes, a BLANK resistor, push botton, jumper wires, and several LEDs. Arduino was used to program the ItsyBitsy.
Here is the Arduino code:

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          #define RED_LEDs 7
          #define LED_GREEN_1 9
          #define LED_GREEN_2 10
          #define LED_GREEN_3 11
          #define BUTTON 12

          void setup() {
            // // put your setup code here, to run once:
            
            // initialize digital pins 
            pinMode(LED_GREEN_1, OUTPUT); // pin 9
            pinMode(LED_GREEN_2, OUTPUT); // pin 10
            pinMode(LED_GREEN_3, OUTPUT); // pin 11
            pinMode(RED_LEDs, OUTPUT);    // all RED LEDs
            pinMode(BUTTON, INPUT);

          }

          void loop() {
            // // put your main code here, to run repeatedly:
            
            int butt = 0;
            butt = digitalRead(BUTTON);
            if (butt == HIGH)
            {
                //Turning ON LEDs sequentially:
                digitalWrite(LED_GREEN_1, HIGH);   // turn ON GREEN LED 1
                delay(250);                        // wait for a 250 ms
                
                int val = 0;
                val = digitalRead(LED_GREEN_1);
                if (val == HIGH) 
                { 
                digitalWrite(LED_GREEN_2, HIGH);   // turn ON GREEN LED 2
                delay(250);                       
           
                val = digitalRead(LED_GREEN_2);
                if (val == HIGH)
                {
                digitalWrite(LED_GREEN_3, HIGH);   // turn ON GREEN LED 3
                delay(250);                        
                digitalWrite(LED_GREEN_1, LOW); 
                digitalWrite(LED_GREEN_2, LOW); 
                digitalWrite(LED_GREEN_3, LOW);
                delay(250); 
                }
                }
             }

            if (butt == LOW) 
            {  
                digitalWrite(LED_GREEN_1, LOW); 
                digitalWrite(LED_GREEN_2, LOW); 
                digitalWrite(LED_GREEN_3, LOW); 
                digitalWrite(RED_LEDs, HIGH);   // turn ON all RED LEDs
                delay(2500);                    // wait for a second
                digitalWrite(RED_LEDs, LOW);    // turn the LED off by making the voltage LOW
                delay(500); 
            }
          } 
          

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