SenseHat object cannot be instantiated more than once. #148
Description
If more than a single SenseHat object is instantiated on a machine any calls to sensor data will return 0 instead of the actual sensor value.
Simple test:
from sense_hat import SenseHat
import unittest
class TestSingleton(unittest.TestCase):
def test_singleton(self):
sense1 = SenseHat()
sense2 = SenseHat()
self.assertEqual(sense1.temperature, sense2.temperature)
if __name__ == "__main__":
unittest.main()This will fail on the current codebase.
I've added pull request #147 to at least prevent this occuring in a single python program by converting the SenseHat object to a thread-safe Singleton, but this will not prevent the issue arriving if multiple projects are using the SenseHat object on the same machine.