I need help with the code for programming a pir sensor to sense and count 3 different objects. Once those 3 objects have been sensed, a servo will activate.
equipment: (1) servo motor, (1) pir sensor, arduino uno
currently, my code activates the servo after only 1 object passes through the pir sensor. Here is a copy of my current code:
#include <Servo.h>
Servo myservo; //creates a servo object
//a maximum of eight servo objects can be created
int pos = 0; //variable to store servo position
//amount of time we give the sensor to calibrate(10-60 secs according to the datasheet)
int calibrationTime = 30;
//the time when the sensor outputs a low impulse
long unsigned int lowIn;
//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 5000;
boolean lockLow = true;
boolean takeLowTime;
int pirPin = 12; //digital pin connected to the PIR's output
int pirPos = 13; //connects to the PIR's 5V pin
void setup(){
myservo.attach(4); //attaches servo to pin 4
Serial.begin(9600); //begins serial communication
pinMode(pirPin, INPUT);
pinMode(pirPos, OUTPUT);
digitalWrite(pirPos, HIGH);
//give the sensor time to calibrate
Serial.println("calibrating sensor ");
for(int i = 0; i < calibrationTime; i++){
Serial.print(calibrationTime - i);
Serial.print("-");
delay(1000);
}
Serial.println();
Serial.println("done");
//while making this Instructable, I had some issues with the PIR's output
//going HIGH immediately after calibrating
//this waits until the PIR's output is low before ending setup
while (digitalRead(pirPin) == HIGH) {
delay(500);
Serial.print(".");
}
Serial.print("SENSOR ACTIVE");
}
void loop(){
if(digitalRead(pirPin) == HIGH){ //if the PIR output is HIGH, turn servo
for(pos = 0; pos < 180; pos += 1) //goes from 0 to 180 degrees
{ //in steps of one degree
myservo.write(pos); //tells servo to go to position in variable "pos"
delay(5); //waits for the servo to reach the position
}
for(pos = 180; pos>=1; pos-=1) //goes from 180 to 0 degrees
{
myservo.write(pos); //to make the servo go faster, decrease the time in delays for
delay(5); //to make it go slower, increase the number.
}
if(lockLow){
//makes sure we wait for a transition to LOW before further output is made
lockLow = false;
Serial.println("---");
Serial.print("motion detected at ");
Serial.print(millis()/1000);
Serial.println(" sec");
delay(50);
}
takeLowTime = true;
}
if(digitalRead(pirPin) == LOW){
if(takeLowTime){
lowIn = millis(); //save the time of the transition from HIGH to LOW
takeLowTime = false; //make sure this is only done at the start of a LOW phase
}
//if the sensor is low for more than the given pause,
//we can assume the motion has stopped
if(!lockLow && millis() - lowIn > pause){
//makes sure this block of code is only executed again after
//a new motion sequence has been detected
lockLow = true;
Serial.print("motion ended at "); //output
Serial.print((millis() - pause)/1000);
Serial.println(" sec");
delay(50);
}
}
}