This is an old version. Please see Current Version.
I²C Port
SPI Port
USB / Charging
Ring Port
Piezo
Motor
Battery
Buck-Boost Converter switch
On
Off
Reset Only
Flash Mode
Mode switch
I²C Solder-On Port
SPI Solder-On Port
JTAG/SWD Interface
Extra IO pins
RTC Battery
Reset/Flash Button
Files
v0.2.0-alpha release on GitHub
Photos
Known issues:
- Device does not start if there is no battery.
- Current is limited to 330 mA (?)
- Flashing mode is not working properly. (fixed)
- NC_1 looks like ground.