10 seconds count down using Arduino

This is one of my 1st Arduino projects. Along with Arduino, I've used a seven segmeent led display and a piezzo buzzer. First, it beeps to indicate start. Then, counts down from 9 to 0, beeps three times. Finally, it beeps for the last time but this time the beep lasts longer.


Awsum man

Awsum man



I couldn’t help it.

Time bomb…

Good. Reminds me of the decade counter project we had to do in our Lab using a 555 as pulse generator,and some JK flip flops.


Thank you. By the way, the circuit you said was built by me too but I had used a 555 and a CD4017. Could you say how you used the flip-flops ?


Thank you dude

Sorry for being late

Yeah,I used four flip flops in cascade, i.e. a counter circuit. Found this while googling.

But,it counts up,not

But,it counts up,not down…i.e. it counts from 0 to 9