moved driver objects into function scope

backend/app.py

@@ -6,13 +6,12 @@ import flask
 import sensors
 
 app = Flask(__name__)
-s = sensors.Spectrometer(path='/dev/serial0', baudrate=115200, tout=1)
-u = sensors.UVSensor()
-l = sensors.LxMeter()
-
 @app.route('/data')
 def sendData():
     '''Responder function for /data route'''
+    s = sensors.Spectrometer(path='/dev/serial0', baudrate=115200, tout=1)
+    u = sensors.UVSensor()
+    l = sensors.LxMeter()
     response = flask.jsonify([s.getData(), l.getData(), u.getABI()])
     response.headers.add('Access-Control-Allow-Origin', '*')
     return response