This project contains the KiCAD files for a button-bar with six buttons. Each button uses some additional hardware-components to debounce the button:
The buttons are pulled up using R1. R2 and C1 serve as a lowpass-filter, i.e. high frequency bouncing is filtered out. The final inverter, a 74HC14 is a Schmitt-Trigger type inverter. This inverter switches from high to low at a different level than from low to high (hysteresis), so this will convert the curve from the RC-filter to sharp edge.
The buttonbar supports 6x6mm buttons and 12x12mm buttons. In addition to the debounce-logic (bottom side of the pcb), there are optional LEDs+resistors on the top.
The footprints for the top-side are 1206, suitable for hand-soldering. The bottom-side uses 0603, ideal for automatic assembly.
Checkout the branch "1x6-layout" for an alternatve button-layout.
In the directory production_files you will find gerber-files, bom and cpl-file
suitable for JCLPCB. Migrating to a format suitable for your favorite
pcb-assembly service should be straightforward.
The directory src contains a simple test program. Without the debouncing
in hardware, you would have to pass an additional parameter to the
Button-constructor for debouncing in software.
Shield:
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
