Every time you upload a new sketch the uploading process wipes the old sketch from memory. So if you want to use both sketches you have to combine them by copying and pasting lines of code into the appropriate sections of the new singular sketch. I would suggest you start with figuring out all the libraries and variables (from both sketches) that first must defined and copy those into one sketch. Then do the same for the void setup() sections and finally void loop() sections. The two functions in the ultrasonic sketch found after the main loop must also be included at the bottom. On a side note, posting code using the code tag ( # ) makes it easier for others to read. For example:
Blink:
int led = 13;
void setup() {
pinMode(led, OUTPUT);
}
void loop() {
digitalWrite(led, HIGH);
delay(1000);
digitalWrite(led, LOW);
delay(1000);
}
Serial:
void setup() {
Serial.begin(9600);
}
void loop() {
Serial.println("Hello World");
delay(1000); // delay in between reads for stability
}
A Serial /Blink Combination:
int led = 13;
void setup() {
Serial.begin(9600);
pinMode(led, OUTPUT);
Serial.println("Hello World");
}
void loop() {
digitalWrite(led, HIGH);
Serial.println("LED is ON");
delay(1000);
digitalWrite(led, LOW);
Serial.println("LED is OFF");
delay(1000);
}