An car includes 4 pairs of headlights that are:

• N: Night Lights.

• L: Low Beam Light.

• H: High Beam Light.

• F: Fog Lights.

These headlights are controlled by a series of 4 switches: n, l, h, f. The following

operation is required:

• any switch necessarily light up the Night light,

• Only one pair of headlights can be switched on,

• the Low Beam Light have priority on the High Beam Light and the Fog Light,

• the Fog Lights have priority on the High Beam Light.

PREPARATION:

The logic functions N, L, H, F will be active at the High level.

1) Give the truth table (or the Karnaugh table) of the logic functions N, L, H, F as a

function of the commands n, l, h, f .

2) Draw the logic circuit of the obtained function.

3) Perform the functions N, L, H, F using the circuits available to you.