PIR Sensor | Write Data If No Motion Detected

[solodrama]

Hello everyone,

I'm trying to write a code to record data motion and no motion moments. The code works well if I just want to record the moments there is motion.

I would like to record the moments when there is no motion every 1 minute. For instance, the code will do that, recording data as "1" to CSV file if there is motion and if there is no motion for 1 min, it will record it as "0" the code below is doing that but I would like to do that if no motion session continue, I would like to record that in every minute as "0" and if there is again motion it should record it again as "1".

Thank you for your help.

Code: Select all

from gpiozero import MotionSensor
from collections import Counter
from threading import Timer
import threading
import datetime
import time
import csv



pir = MotionSensor(6)

def time_now():
 now = datetime.datetime.now().strftime("%H:%M")
 now = str(now)
 return(now)

def date_now():
 today = datetime.datetime.now().strftime("%d/%m/%Y")
 today = str(today)
 return(today)

def nomotion():
    print("no motion")


counter = 0
y = datetime.datetime.now()
while True:
         pir.wait_for_motion()
         print('Motion {0},{1}'.format(counter,y))
         counter += 1
         data = '1'
         with open('data.csv', mode= 'a') as output:
                 csvwriter = csv.writer(output, quoting = csv.QUOTE_MINIMAL)
                 csvwriter.writerow([date_now(), time_now(), data])
                 output.close()
         pir.wait_for_no_motion()

         t = Timer(5.0, nomotion)
         t.start()
         data2 = '0'
         with open('data.csv', mode= 'a') as output2:
          csvwriter = csv.writer(output2, quoting = csv.QUOTE_MINIMAL)
          csvwriter.writerow([date_now(), time_now(), data2])
          output2.close()
          time.sleep(2)

[pcmanbob]

Your code will never do what your want because you are using pir.wait_for_motion() this stops you code until that condition is met.

You need to change the way your code works so that it cycles on a while loop so that after 60 seconds if no high ouptut from the PIR has occurred you write the data you want to the CSV file , but if a high output from the PIR does occur you reset the 60 second timer and write your required data to the CSV file.

[PiGraham]

Set a variable true in an edge detection callback function when motion is detected.
Set a timer to log to file every minute. Test the variable to decide whether to write 1 (motion occurred in the last minute) or 0 (o motion was detected in the last minute).
Then set the variable false.
Alternatively increment a count variable every time motion is detected and log the activity count for each minute.

[pcmanbob]

Here is a basic example

Code: Select all

import RPi.GPIO as GPIO
import time


GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(6, GPIO.IN)

end = (time.time()) + 60


def writetofile(data):
    daten = (time.strftime("%d/%m/%Y"))
    timen = (time.strftime("%H:%M"))
    with open("/home/pi/data.csv", "a") as output:
        output.write(daten + "," + timen + "," + data + "\n")
        

def motion(channel):
    data = "1"
    writetofile(data)
    print("Motion")
    end = (time.time()) + 60
    return end

   
GPIO.add_event_detect(6, GPIO.RISING, callback=motion, bouncetime=500)   

while True:
    if (time.time()) > end:
        data = "0"
        writetofile(data)
        print("No Motion")
        end = (time.time()) + 60
        
    time.sleep(1)
    

[solodrama]

thank you guys. I'll try your suggestions, I hope I can make it work because I'm really beginner for python things.