Xinabox - xBUS Connectors - til micro:bit
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On the ☒CHIP, the xBUS connector has 10 pins (5 on either side). Of these 10 pins, 4 pins are used for power and 6 pins are used for data transfer.
4 power pins for:
A ground pin GND (0 V)
Provides 3.3 V
V source is a battery or power source (which can be used to supply raw power)
V in is a battery input pin which has not been used but one possibility would be to use it for solar power etc.
6 data pins for:
2 pins used for I2C: one is for SDA and one is for SCL
2 pins used for serial (aka UART): one is for TX and one is for RX
2 pins used for programming: one pin is for programming other core modules and one pins is a reset pin.
link to i2c page
link to serial page