traffic light simulation

[nitu gupta]

i am trying to simulate a traffic light and glow green, yellow, red lights in sequence for some duration.

If i run separate timers for each of them and make the timers 'always enabled' and 'always fire' then there seems to be some synchronization problem.

Can anybody provide more tips for simulating these ?

thanks in advance,

Nitu

[Italo]

Don't do 3 separate timers. Do only one and change the interval depending on the current color.

[Taifun]

what about using only one clock component together with a counter variable?

pseudo code for the clock.timer event

counter = counter + 1

if counter < 20

then display green light

else if counter < 25

then display yellow light

else display red light

if counter > 40 then counter = 0

Taifun

---

Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by Taifun.         

[Tim Carter]

For a true simulation won't you at least need two timers, because red and amber need to come on at the same time (or red on first then amber on, then both off and green on) ? I could be wrong...

[Taifun]

one timer is sufficient...

updated pseudo code for the clock.timer event, adjust it to your needs...

counter = counter + 1

if counter < 20

then display green light

else if counter < 25

then display yellow light and display red light

else display red light

if counter > 40 then counter = 0

Taifun

[Tim Carter]

Ah yes :)