{"id":17207,"date":"2021-11-23T19:24:53","date_gmt":"2021-11-23T18:24:53","guid":{"rendered":"https:\/\/nerdiy.de\/?p=17207"},"modified":"2021-11-24T07:49:57","modified_gmt":"2021-11-24T06:49:57","slug":"button-board","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/en\/button-board\/","title":{"rendered":"HowTo: PCB - Build ButtonBoard PCB V1.2"},"content":{"rendered":"

The ButtonBoard PCB is my attempt to kill several birds with one stone. On the one hand, I have always been looking for a universal and easy-to-program remote control for the often very individual control options in my smart home. On the other hand, I wanted to have an easy way to control my projects (for example the pxlBlck project<\/a><\/em><\/strong>) with a physical operating option.<\/p>\n\n\n\n

Currently, the various pxlBlck platforms<\/a><\/em><\/strong> This is because it can only be controlled via the serial interface or an existing WiFi connection. <\/p>\n\n\n\n

Unfortunately, this means that these projects (for example) are difficult to give away. At least not to people who are not interested in Arduino, electronics and the like themselves or at least can\/want to deal with it if it is necessary for hiring. <\/p>\n\n\n\n

I want to solve this disadvantage with the ButtonBoard \ud83d\ude42<\/p>\n\n\n\n

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For this purpose, twelve simple buttons and four side buttons are installed on the larger part of the front of the ButtonBoard. These are read out via a PCF8575<\/span> I2C port expander. For this combination to work, each button is also equipped with an external pull-up resistor. <\/p>\n\n\n\n

Of course, it would have been more elegant to use a port expander with an integrated\/switchable pull-up or pull-down resistor. However, due to the current chip shortage and because I already had the PCF8575 at home, I didn't want to start any new experiments here. <\/p>\n\n\n\n

In addition to the buttons, two WS2812 2020 LEDs are installed next to each button. This means that the buttons can also be indirectly illuminated or button presses can be visualized.<\/p>\n\n\n\n

The other components on the front of the PCB are<\/p>\n\n\n\n