User manual

4 Pedestrian lights

In the next experiment we are going to extend the traffic light by adding a pedestrian light which will feature

a flashing light for pedestrians during the traffic light’s red phase, as is common practice in some countries.

Obviously we could also integrate a pedestrian light into the program with red and green lights, which are

commonplace in Central Europe. However, besides the LEDs used for the traffic light the learning package

contains only one more LED.

For the following experiment incorporate an additional LED with series resistor into the circuit as illustrated.

This will be connected to the GPIO port 24.

Fig. 4.1: Breadboard assembly for traffic light and flashing light for pedestrians.

Components required:

1x breadboard

1x LED red

1x LED yellow

1x LED green

1x LED blue

4x 220-ohm series resistor

5x connecting wire