- #1
ttsky
- 20
- 0
Hi all,
my task is to measure the charge time of an RC circuit with a counter using FPGA, once the cap is charged, i must discharge it again for next input. Idea is to discharge it with a signal from FPGA, but what sort of circuit would allow this without discharging the cap prematurely?
if it helps, the circuit is for a 4x4 matrix keypad, row and colums tied to resistors and a cap, each button press should produce a diffrent charge time, i need the caps to be discharged before next keystroke.
Thanks
∫Aziz∫
my task is to measure the charge time of an RC circuit with a counter using FPGA, once the cap is charged, i must discharge it again for next input. Idea is to discharge it with a signal from FPGA, but what sort of circuit would allow this without discharging the cap prematurely?
if it helps, the circuit is for a 4x4 matrix keypad, row and colums tied to resistors and a cap, each button press should produce a diffrent charge time, i need the caps to be discharged before next keystroke.
Thanks
∫Aziz∫