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Making a Shield
johnrees edited this page Apr 11, 2013
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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.
| 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 |
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 |
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.