Countdown timer project help

[Owcalex]

I am designing a 30 minutes countdown timer with a LDR in the circuit.

So far i can`t even achieve a simple countup timer from 0-9 , please help.

Clock pulse (Astable multivibrator)- 555 timer circuit

4 bit counter wired as MOD 10 74LS293N

74LS47N Decoder 

LED common anode.

[SQYARE]

It seems that your 555 timer isn't counting, I hooked up an oscilloscope to it to see what it was generating