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General use

You will need a USB-C cable to charge your card10. You can also use it as a storage device to read/write files and update software. We plan to provide most of these functions via BLE as well, but a wired connection might still come handy. The charging and file transfer works whichever way round the USB-C cable is plugged in.

Full I/O

Traveler reports agree that the badge uses USB-C, the assumption is that this was chosen over Micro-USB for the available range of extra pins. The reconstruction thus has some extra pins available, which would explain several observations of hardware interHacktions using USB-C.

Pin Name	Pin Number	Usage	Comment
SBU1	A8	SWDIO (GPIO)	Primary use for SWD. Firmware can reconfigure to GPIO
SBU2	B8	SWCLK (GPIO)	Primary use for SWD. Firmware can reconfigure to GPIO
RX1+	B11	ECG P	ECG P can be switched between this pin and the wristband via firmware
RX1-	B10	ECG N
TX1+	A2	ECG COM	ECG common mode buffer output.
TX1-	A3	-
RX2+	A11	UART RX
RX2-	A10	UART TX (via Diode)	The diode protects USB tranceivers
TX2+	B2	Reset	Pull low to trigger a reset
TX2-	B3	-

Schematics

!Caution! Most USB-C cables available for sale do not connect all pins of the connector. Whilst this is not a problem for general use, if you want to access the full available I/O contacts, it might be best to choose a cable from the suggestions listed at the bottom of the page.

To use full I/O, there is a ‘correct side up’ for the USB-C cable.

SWD

UART

ECG

External ECG electrodes can be connected via USB-C with a self-made cable.

GPIOs

‘Confirmed’ full pin cable options

Whilst this list does not guarantee you anything, these cables have been bought before and were found to have all contacts connected:

• Anker AK-A8183011