{"id":7684,"date":"2018-04-18T16:00:50","date_gmt":"2018-04-18T16:00:50","guid":{"rendered":"http:\/\/blog.bachi.net\/?p=7684"},"modified":"2018-05-21T15:04:25","modified_gmt":"2018-05-21T15:04:25","slug":"raspberry-pi-3-gpio-inputpush-button-and-pull-updown","status":"publish","type":"post","link":"https:\/\/blog.bachi.net\/?p=7684","title":{"rendered":"Raspberry Pi 3, GPIO Input\/Push Button and Pull-Up\/Down"},"content":{"rendered":"

“The input current however is something nobody usually cares about as in digital circuits we usually assume low impedance<\/em> outputs<\/strong> and high impedance<\/em> inputs<\/strong>.”<\/p>\n

What is the minimum current value into the Pi’s GPIO input?<\/a>
\nPush buttons – should I be using a resistor or not? (yes)<\/a>
\nBread Board Setup for Input Buttons<\/a>
\nGPIO Electrical Specifications<\/a><\/p>\n

GPIO pin pull state on powerup<\/h3>\n<\/h4>\n

New<\/h4>\n

dt-blob.bin not working for RaspberryPi 3+ ?<\/a>
\nNew “gpio” config command<\/a>
\nNew “gpio” config.txt command announcement<\/a><\/p>\n

Old<\/h4>\n

Changing the default pin configuration<\/a>
\nDevice Trees, overlays, and parameters<\/a>
\ngithub.com\/raspberrypi\/firmware\/blob\/master\/extra\/dt-blob.dts<\/a><\/p>\n

Enabling Pullup and Pulldown Resistors on The Raspberry Pi<\/a>
\nDevice Tree Overlay to adjust GPIO Outputs<\/a>
\nRaspberry Pi GPIO states at boot time<\/a>
\nRaspberry Pi Device Tree and Overlay Configuration<\/a><\/p>\n

GPIO pin states on powerup [duplicate]<\/a>
\nDefault pin pull state upon boot <\/a>
\nPower on behaviour<\/a>
\nOverride GPIO state at boot<\/a> (2016)
\nGPIO Pin States a Boot time – Change in 3.6.11+<\/a> (2013)<\/p>\n

5V to 3.3V<\/h3>\n