Flowchart

This is a finalised version of a flow diagram that explains the sequence of events if either push button is pressed. Basically if Push Button One is pressed, the left row of LED's will go through a basic sequence to show a typical bus coming down a route and stopping at the bus stop. If the second Push Button is pressed the right row of LED’s go through a simular process to the left row aside from getting delayed half-way down the route.

The Diagram shows white circles next to the LED’s which are light sensors. We decided to change from a membrane potentiometer to light sensors, for quite a few reasons including price, accuracy and manufacturing ability. Their will now be an extra layer of MDF sandwiched between the acrylic layers which has squares removed only around the groups of LED’s/Light sensors. This will form a box around the light sensor so when a finger is placed over the tiny box (~8mmx8mm) all light is omitted and the sensor will produce a signal.

This signal will be used to power a vibrating motor, so people that are blind can feel down the route and know where the bus is in relation to their stop.