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Making a Shield

johnrees edited this page · 7 revisions

This is are how the pins are laid out on the board. The numbers in brackets are the actual pin numbers of the microcontroller. Pins IO* are digital and S* are analogue.

SMART CITIZEN BOARD pin layout

GND GND
IO3 (10) IO2 (9)
IO1 (13) IO0 (5)
SCL SDA
S5 (A1) S4 (A0)
S3 (A3) S2 (A2)
S1 (A5) S0 (A4)
VBAT VBAT

SHIELD pin layout (mirrored)

If your shield's pins are surface mounted i.e. not going through/below the board then you should remember to mirror the layout above, like so.

GND GND
IO2 (9) IO3 (10)
IO0 (5) IO1 (13)
SDA SCL
S4 (A0) S5 (A1)
S2 (A2) S3 (A3)
S0 (A4) S1 (A5)
VBAT VBAT

Voltage Regulation

You connect a 3.3V regulator to VBAT and GND with a couple of capacitors (depending on the regulator you use) to get a steady 3.3v voltage from the battery.

Useful links

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