Merge pull request #176 from srobo/sonar-angles

Distance sensors don't work at extreme angles

Author: WillB97

simulator/programming/index.md

@@ -68,6 +68,7 @@ Analogous to ultrasound sensors, distance sensors allow you to retrieve the dist
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 These are shown as blue coloured blocks on the robot. The `analogue_read` method will return the distance in metres, however only measure up to 30cm.
+Since these sensors rely on echoes being reflected back from objects, if the angle of incidence between the sensor's pulse and the contacted surface exceeds 22.5 degrees then the sensor will be unable to detect the object.
 
 #### LEDs