The Binary Keypad
A fairly simple circuit; I designed and built it in an afternoon.
This is a keypad that can be used to manually send data to a shift register or other serial-input circuit, without having to wire up and program a microcontroller
Simply connect it to the clock and data lines (and 5V and ground) and you're good to go. Pressing 0, naturally, shifts in a logic low, and pressing 1 shifts in a logic high.
The third button can be used to activate a latch input, clear enable, or any other logic input. The small green switch to its right determines if the third button is active-high or active-low.
The switches are debounced with Schmitt-trigger inverters.
The Binary Keypad
A fairly simple circuit; I designed and built it in an afternoon.
This is a keypad that can be used to manually send data to a shift register or other serial-input circuit, without having to wire up and program a microcontroller
Simply connect it to the clock and data lines (and 5V and ground) and you're good to go. Pressing 0, naturally, shifts in a logic low, and pressing 1 shifts in a logic high.
The third button can be used to activate a latch input, clear enable, or any other logic input. The small green switch to its right determines if the third button is active-high or active-low.
The switches are debounced with Schmitt-trigger inverters.