The 3V and GND rings have guard strips either side of the big rings, to avoid any degradation of device performance due to slipping crocodile clip connections. RINGs for 0, 1, 2, 3V and GND are also connected to the respective reverse side rings on the edge connector. e10Mu means an external 10Mohm pullup, i12Kd means an internal 12K pull down. The startup conditions (direction) when the micro:bit boots: Input or Output The name that is used in the DAL runtime softwareĪll possible functions, BOLD for default. The actual pin name of the Nordic MCU chip The symbol name in the micro:bit schematics The micro:bit basic interface (the 5 rings on the front) This table shows various data about each of the pins on the micro:bit edge connector. is a fantastic resource for further information on the micro:bit pins and how they are used by some popular accessories Pins and Signals Pin 9 is no longer jointly shared with the LED display, but Pin 8 and Pin 9 can be configured for NFC (though this is disabled by default). The diagrams below show the assignation of the micro:bit pins.

The back rings are connected to the front rings, but the back small strips are unconnected.

Only the pins on the front are connected to signals. There are a number of external PCB connectors for purchase with an 80w 1.27mm pitch that can be used to easily access these extra pins. The smaller strips spaced at 1.27mm on the edge connector have additional signals, some of which are used by the micro:bit, and others that are free for you to use. 3 of these rings are for general purpose input and output (GPIO) and are also capable of analog, PWM and touch sensing, and two are connected to the micro:bit power supply. There are 25 strips/pins including 5 rings for using with 4mm banana plugs or crocodile clips. The edge connector on the micro:bit is used to connect to external circuits and components.

Download free 4 pin fan pinout