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.