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| import os | |
| import RPi.GPIO as GPIO | |
| import time | |
| import subprocess | |
| import datetime | |
| #Object declaration for getting current date and time | |
| current = datetime.datetime.now() | |
| #Pin number assignment for generating alert | |
| Rasptrigger = 21 | |
| #Constant declaration for threshold according to sitting posture and height of table | |
| threshold = 24 | |
| #Module 1 specification | |
| TRIG1 = 9 | |
| ECHO1 = 11 | |
| #Module 2 specification | |
| TRIG2 = 5 | |
| ECHO2 = 6 | |
| GPIO.setmode(GPIO.BCM) | |
| #Sensor 1 setup | |
| GPIO.setup(TRIG1,GPIO.OUT) | |
| GPIO.setup(ECHO1,GPIO.IN) | |
| #Sensor 2 setup | |
| GPIO.setup(TRIG2,GPIO.OUT) | |
| GPIO.setup(ECHO2,GPIO.IN) | |
| GPIO.setup(Rasptrigger, GPIO.OUT) | |
| #Global variable declaration for sonar function | |
| pulse_start = 0 | |
| pulse_end = 0 | |
| #Function to fetch precise distance of obstacle | |
| def sonar(trigger, echo): | |
| global pulse_start,pulse_end | |
| #Small pulse transmitter from trigger | |
| GPIO.output(trigger, False) | |
| time.sleep(0.3) | |
| GPIO.output(trigger, True) | |
| time.sleep(0.00001) | |
| GPIO.output(trigger, False) | |
| #Small pulse receiver on echo pin | |
| while GPIO.input(echo)==0: | |
| pulse_start = time.time() | |
| while GPIO.input(echo)==1: | |
| pulse_end = time.time() | |
| #Difference between transmission and reception of pulse | |
| pulse_duration = pulse_end - pulse_start | |
| #Formulate time into distance | |
| distance = pulse_duration * 17150 | |
| #Round the distance into readable format in cm | |
| distance = round(distance, 2) | |
| return distance | |
| try: | |
| while True: | |
| distance1 = sonar(TRIG1, ECHO1) | |
| distance2 = sonar(TRIG2, ECHO2) | |
| print "Distance1:",distance1,"cm " + "Distance2:",distance2,"cm" | |
| if (distance1 > threshold) and (distance2 > threshold): | |
| #Print the datetime of leaving the table | |
| print "You just took a break at " + current.strftime("%Y-%m-%d %H:%M") + " good for health" | |
| GPIO.output(Rasptrigger, True) | |
| time.sleep(5) | |
| else: | |
| GPIO.output(Rasptrigger, False) | |
| time.sleep(0.1) | |
| except: | |
| #Print on getting ctrl+c command for safe termination of program | |
| print "Live Strong" | |
| finally: | |
| #Safe termination and clear the state of GPIO | |
| GPIO.cleanup() |