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#!/usr/bin/python
import time
import subprocess
import signal
import logging
from range_sensor import RangeSensor
from graceful_kill import GracefulKiller
logging.basicConfig(format='%(asctime)s: %(message)s',datefmt='%m/%d/%Y %I:%M:%S %p', filename='/var/log/detect_person.log', filemode='w', level=logging.INFO)
r = RangeSensor()
gk = GracefulKiller()
def turn_tv_on():
subprocess.call(['/home/pi/tv_on.sh'])
def turn_tv_off():
subprocess.call(['/home/pi/tv_off.sh'])
STATE_OFF=0
STATE_ON=1
thresh = 50 #cm
t_start =0
t_on=314 #time to stay on, in seconds
if __name__=="__main__":
logging.info("Starting up...")
distance=r.read()
old_distance=distance
state = STATE_OFF
while True:
if gk.killed():
logging.info("Now shutting down, received signal")
break
old_distance = distance
distance= r.read()
if state==STATE_OFF:
if ((old_distance - distance) > thresh): #only when someone moves closer
state=STATE_ON
turn_tv_on()
t_start = int(time.time())
logging.info("MIRROR ON")
logging.info("DISTANCE: %f OLD DISTANCE: %f"%(distance,old_distance))
elif state==STATE_ON:
if ((t_start + t_on) < time.time()):
logging.info("MIRROR OFF")
state=STATE_OFF
turn_tv_off()
turn_tv_off()
[Unit]
Description=Service to turn on tv when someone is in front of it
[Service]
Type=simple
ExecStart=/home/pi/detect_person.py
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target
import signal
import time
class GracefulKiller:
kill_now=False
def __init__(self):
signal.signal(signal.SIGINT, self.exit_gracefully)
signal.signal(signal.SIGTERM, self.exit_gracefully)
def exit_gracefully(self,signum,frame):
self.kill_now=True
def killed(self):
return self.kill_now
#!/usr/bin/python
import RPi.GPIO as GPIO
import time
TRIG = 23
ECHO = 18
class RangeSensor:
def read(self):
GPIO.setmode(GPIO.BCM)
GPIO.setup(TRIG,GPIO.OUT)
GPIO.setup(ECHO,GPIO.IN)
GPIO.output(TRIG, False)
time.sleep(2)
GPIO.output(TRIG, True)
time.sleep(0.00001)
GPIO.output(TRIG, False)
while GPIO.input(ECHO)==0:
pulse_start = time.time()
while GPIO.input(ECHO)==1:
pulse_end = time.time()
pulse_duration = pulse_end - pulse_start
distance = pulse_duration * 17150
distance = round(distance, 2)
GPIO.cleanup()
return distance
[Unit]
Description=Control power to tv
[Service]
Type=oneshot
ExecStart=/home/pi/tv_on.sh
ExecStop=/home/pi/tv_off.sh
RemainAfterExit=yes
[Install]
WantedBy=single-user.target
#!/bin/bash
#if tv is on, turn it off
POWER_ON=$(/home/pi/tv_read_power_state.sh)
if [ "$POWER_ON" = "1" ]; then
/home/pi/tv_toggle_power.sh
fi
#!/bin/bash
#if tv is off, turn it on
POWER_ON=$(/home/pi/tv_read_power_state.sh)
if [ "$POWER_ON" = "0" ]; then
/home/pi/tv_toggle_power.sh
fi
#!/bin/bash
gpio -g mode 15 in
gpio -g read 15
#!/bin/bash
gpio -g mode 14 out
gpio -g write 14 1
sleep 0.25
gpio -g write 14 0
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