Hi everyone, I've got a problem on water pump. I am using a fingerprint sensor (AS608) to control a water pump. When the fingerprint match, the water pump start pumping liquid for 5 seconds and then stop. I have try the code and it works. However, once i have unplug the connection with the PC and connect again, the water pump keep pumping without stop. I have upload the code again and cannot stop. May I know what is the problem? Thank you!
#include <Adafruit_Fingerprint.h>
SoftwareSerial mySerial(2, 3);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
#define RELAY_PIN 10
#define ACCESS_DELAY 5000 // Keep lock unlocked for 3 seconds
void setup()
{
// set the data rate for the sensor serial port
finger.begin(57600);
delay(5);
if (finger.verifyPassword())
{
}
else
{
while (1) { delay(1); }
}
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, HIGH); //Switch off relay initially. Relay is LOW level triggered relay so we need to write HIGH.
}
void loop()
{
if ( getFingerPrint() != -1)
{
digitalWrite(RELAY_PIN, HIGH);
delay(ACCESS_DELAY);
digitalWrite(RELAY_PIN, LOW);
}
delay(50); //Add some delay before next scan.
}
// returns -1 if failed, otherwise returns ID #
int getFingerPrint()
{
int p = finger.getImage();
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz();
if (p != FINGERPRINT_OK) return -1;
p = finger.fingerFastSearch();
if (p != FINGERPRINT_OK) return -1;
// found a match!
return finger.fingerID;
}
