Python

Google Traffic

This program uses the Google Maps API to check the travel time between two points on the road and light up LEDs on a Raspberry Pi to indicate the level of traffic between those points. Low traffic would light a green LED, for medium traffic a yellow LED would light up and a red LED for when traffic was heaviest.

I had to check the maps at different times over a day to see roughly the time (in seconds) that correlates with low, medium and heavy traffic, which is hardcoded in the script.

Unfortunately the Distance Matrix API isn't free to use anymore, but I've attached the code anyway. One day I'll work out how to get it working for free again.

import RPi.GPIO as GPIO import http.client import time LowLED = 18 MedLed = 23 HighLed = 17 GPIO.setmode(GPIO.BCM) GPIO.setup(LowLED, GPIO.OUT) GPIO.setup(MedLed, GPIO.OUT) GPIO.setup(HighLed, GPIO.OUT) GPIO.output(LowLED, GPIO.LOW) GPIO.output(MedLed, GPIO.LOW) GPIO.output(HighLed, GPIO.LOW) while True: conn = http.client.HTTPSConnection("maps.googleapis.com") conn.request("GET", "/maps/api/distancematrix/json?origins=-37.781027,145.024719&destinations=-37.766315,145.027382&departure_time=now&traffic_model=best_guess&mode=driving&key=AIzaSyAXaC6iMpWHCjoIUZ2JAeT-IQ_Oi4gdv8Y") r1 = conn.getresponse() #print(r1.status, r1.reason) data1 = r1.read() #print(data1) text = b'duration_in_traffic' location = data1.find(text) value = data1[location:] #print(value) newtext = b'value' newlocation = value.find(newtext) newstring = value[newlocation:] #print(newstring) findend = b'\n' endlocation = newstring.find(findend) finalvalue = newstring[9:endlocation] #print(finalvalue) mystring = int(finalvalue) print(mystring) if mystring > 230: print('HIGH') GPIO.output(LowLED, GPIO.LOW) GPIO.output(MedLed, GPIO.LOW) GPIO.output(HighLed, GPIO.HIGH) elif 170 < mystring <= 230: print('MED') GPIO.output(LowLED, GPIO.LOW) GPIO.output(MedLed, GPIO.HIGH) GPIO.output(HighLed, GPIO.LOW) else: print('LOW') GPIO.output(LowLED, GPIO.HIGH) GPIO.output(MedLed, GPIO.LOW) GPIO.output(HighLed, GPIO.LOW) time.sleep(5) conn.close()