Keyestudio ARDUINO maker learning kit Manual page 67

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Sample program
//////////////////////////////////////////////////////////
int pin = 7; //attach to the third pin of NE555
unsigned long duration; //the variable to store the length of the pulse
void setup()
void setup()
{
Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read rotation sensor value from analog 0
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