IO4 Bricklet + button to switch on/off Motion Detector

[ben_bienne]

Hi all,

 

Actually I use a Motion Detector and Raspberry Pi with camera to take picture when something is moving. It work good. I can switch on/off the Motion Detector with my computer keyboard

 

Now I would like to do the same without my keyboard and screen but with a manual switch.

 

I have an IO4 Bricklet and a button ON/OFF. I am new in programming and I don't find the way to do this.

 

Can someone help me.

 

Here is my python code

#!/usr/bin/env python
# -*- coding: utf-8 -*-  

HOST = "localhost"
PORT = 4223
UID = "ksc" # Change to your UID

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_motion_detector import MotionDetector

import picamera
import time

camera_name = "cameraA_"

# Callback function for end of detection cycle
def cb_detection_cycle_ended():
    if not system_activ:
        return
    print('Detection Cycle Ended (next detection possible in ~3 seconds)')

# Callback function for detected motion
def cb_motion_detected():
    if not system_activ:
        return
    print('Motion Detected')
    with picamera.PiCamera() as camera:
                date_time = int(time.time())
                date_string = str(date_time)
    		camera.resolution = (1024, 768)
	camera.start_preview()
	# Camera warm-up time
	time.sleep(2)
	camera.capture(camera_name + date_string +".jpg")

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    md = MotionDetector(UID, ipcon) # Create device object

    ipcon.connect(HOST, PORT) # Connect to brickd

    system_activ = True

    # Don't use device before ipcon is connected

    # Register detected callback to function cb_motion_detected
    md.register_callback(md.CALLBACK_MOTION_DETECTED, cb_motion_detected)

    # Register detection cycle ended callback to function cb_detection_cycle_ended
    md.register_callback(md.CALLBACK_DETECTION_CYCLE_ENDED, cb_detection_cycle_ended)

while True:
        print "Select an option:"
        print "1.    Turn surveillance off" if system_activ is True else "1.    Turn surveillance on"
        print "0.    Exit"
        option = int(raw_input("Option: "))
        if option == 0:
                break
        elif option == 1:
            if system_activ:
                system_activ = False
                print "Surveillance is disabled"
            else:
                system_activ = True
                print "Surveillance is enabled"
        else:
            print "Invalid input!"

    # raw_input('Press key to exit\n') # Use input() in Python 3
    ipcon.disconnect()

 

Thank's in advance

[photron]

Take a look at the interrupt example for the IO-4 Bricklet.

 

You connect your button to pin 0 and a GND pin on the IO-4 Bricklet. Each time the button is pressed or released you get an interrupt callback. You can modify the cb_interrupt() function from the example like this (untested):

 

def cb_interrupt(interrupt_mask, value_mask):
    # test if interrupt is from pin 0 
    if interrupt_mask & (1 << 0):
        # test if button is pressed or released
        if value_mask & (1 << 0):
            print "button released"
        else
            print "button pressed"

            if system_activ:
                system_activ = False
                print "surveillance is disabled"
            else:
                system_activ = True
                print "surveillance is enabled"

 

Now your script can tell if the button was pressed or released. With this information you can then set your system_activ variable.

[ben_bienne]

Thank you for the help! It work's!

 

Here is the complete code

#!/usr/bin/env python
# -*- coding: utf-8 -*-  

HOST = "localhost"
PORT = 4223
UID = "ksc" # Change to your UID
es = "he6" # Change to your UID

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_motion_detector import MotionDetector
from tinkerforge.bricklet_io4 import IO4

import time

system_activ = True

def cb_interrupt(interrupt_mask, value_mask):
    global system_activ
    # test if interrupt is from pin 0 
    if interrupt_mask & (1 << 0):
        # test if button is pressed or released
        if value_mask & (1 << 0):
            print "button released"
        else:
            print "button pressed"

            if system_activ:
                system_activ = False
                print ("surveillance is disabled ", +system_activ)
            else:
                system_activ = True
                print ("surveillance is enabled ", +system_activ)

# Callback function for end of detection cycle
def cb_detection_cycle_ended():
    if not system_activ:
        return
    print('Detection Cycle Ended (next detection possible in ~3 seconds)')

# Callback function for detected motion
def cb_motion_detected():
    if not system_activ:
        return
    print('Motion Detected')

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    md = MotionDetector(UID, ipcon) # Create device object
    io = IO4(es, ipcon) # Create device object
    ipcon.connect(HOST, PORT) # Connect to brickd
   
    # Don't use device before ipcon is connected

    # Register callback for interrupts
    io.register_callback(io.CALLBACK_INTERRUPT, cb_interrupt)

    # Enable interrupt on pin 0 and pin 1
    io.set_interrupt(1 << 0 )

    # Register detected callback to function cb_motion_detected
    md.register_callback(md.CALLBACK_MOTION_DETECTED, cb_motion_detected)

    # Register detection cycle ended callback to function cb_detection_cycle_ended
    md.register_callback(md.CALLBACK_DETECTION_CYCLE_ENDED, cb_detection_cycle_ended)

raw_input('Press key to exit\n') # Use input() in Python 3
ipcon.disconnect()