KC868-A4 DIGITAL I/O

[franco.demei@gmail.com]

your code function is when digital input trigger, Toggle relay.
you can replace this code:
digitalWrite(Relay1, !digitalRead(Relay1));

use if .... else  ...    for ON/OFF relay.

Thank you Sir, 
SOLVED  in this way :
void ScanKey1() {
  KEY_NUM1 = 1;                               // Key1 unpressed
  if (digitalRead(Key1) == LOW) {             // Key1 Pressed
    delay(20);
     if (digitalRead(Key1) == LOW) {
      KEY_NUM1 = 0;                           // if digitalRead(Key1 == low)
         digitalWrite(Relay1, HIGH);          // Relay1 is Turned ON
        } else {                              // if Key1 is turned OFF (Key4 open)
      digitalWrite(Relay1, LOW);              // Rela1 is turned OFF
      }
    }
 }