Varied adc input to be displayed on a 7 segment display

Hi,
I constructed an ADC (8bit) using LM339 and a variable resistor. I want to have a display on a 7segment using 7490ic and 7447ic by varying the variable resistor. Also, i would like to know or better if instead counting only upwards when the variable resistor is varied or both up and down.
Theoritically, the circuit should work but am having difficulty piecing the ADC to the "display end".
Please find attached.
Attachments:
Design7.ms11 ‏275 KB

Hi there,
The ground has been added, but not functioning as is supposed to. The objective is to get the 7segment display counting as the varaible resistor is varied. But once the circuit is powered it just reads "7" and doesnt move. I replaced the ADC part with normal switches and it functioned as it was supposed to .
Br,
Qwesy
Attachments:
Design5.ms11 ‏228 KB

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