![]() ![]() ![]() On Raspberry Pi models starting with model 3B (including Raspberry Pi Model 400) the hardware-based serial/UART device /dev/ttyAMA0 has been re-purposed to communicate with the the built-in Bluetooth modem and is no longer mapped to the serial RX/TX pins on the GPIO header. (click here for hi-resolution image) Known Issues The diagram below illustrates the GPIO pinout using the Pi4J/WiringPi GPIO numbering scheme. (click here for hi-resolution image) GPIO Pinout (40-pin Header) The Raspberry Pi 400 contains a single 40-pin expansion header located on the back of the keyboard housing providing access to 28 unique GPIO pins. Please see this page for more information on both the WiringPi and Broadcom pin numbering schemes: (NOTE: Pi4J also can be configured to use the Broadcom Pin numbering scheme.) ![]() Pi4J provides a RaspiPin enumeration that is used to manage the accessible GPIO pins. More information about the WiringPi pin number scheme can be found here: Pi4J implements the same pin number scheme as the Wiring Pi project. Pi4J (by default) uses an abstract pin numbering scheme to help insulate software from hardware changes. ![]()
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