I ran into a problem with a beginner code that I found online: void setup() { Serial.begin(9600); pinMode(ledpin,OUTPUT); } void loop() { val=Serial.read(); if(val=='R') { digitalWrite(ledpin,HIGH); delay(500); digitalWrite(ledpin,LOW); delay(500); Serial.println("HelloWorld!"); } } …

How do I fix the error that says 'ledpin' was not declared in this scope?

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