This is a variant to my original ButtonBox
There is also ButtonBox v2

It is half the height (because there is no space reserved to put an mcu) and half the length cause it has just 4 buttons, not eight.

No mcu was needed since I already have one in a box very close which controls a temperature sensor only so it has plenty of free GPIO. The new interface (and a bit of programming) adds one-click reminders at the kitchen (where I need them most).

5, 10, 15, 20 minutes. The buttonBox needs a 5-wire connection, Ground and the four GPIO-contacts. The mcu creates interrupts for FALLING or RISING on the 4 pins, does a little debouncing and sends the events via mqtt.

openHAB listens on the message bus, sets up timers accordingly and gives immediate feedback and later the alarms with a nice voice from google tts.

I know, most people use Alexa or Google Home for that, but I just do not trust them so I rather built my own.

It is optimized for tactile buttons with 2 Pin DIP 6 x 6 x 5 mm (2 pins much easier to solder than the shorter 4 pin types)

When printing, some parts, notably the bottom plate, need to be turned 180° around x- or y- axis.

Category: Electronics