i need some advice how to prepare digital electronic circuit.
I have 64 signal lines, every line have a NO tact switch with latch . I need desiplay how much "1 or ON" signal i have and display this value on two 7segment displays.
difficulty: i can't use microcontroller/microprocessor/fpga or equivalent device. only mux/demux/counter/decoder and other "simple digital stuff"
every tip will be helpful thanks!
My idea is: connect 65 resistors in series 64x100Ohm + 1x6.4kOhm(Like a shunt resitor). Every single resistor from 64 will be connected parrarel with button if i click the button then i will have a bigger voltage drop on 6.4kOhm resistor. The voltage drop on 6.4k resistor connect to flash adc and then move out signal from priority encoder to 2x7seg displays.