Generated schematic and PCB

This is version 1 of a PCB for the CALI-LED system. The board has been
designed to integrate an Adafruit Trinket (http://adafru.it/1500 or
http://adafru.it/1501), either 3V or 5V version, with a MAX6957AAX+ LED
driver, taking power from either a 3.7V LiPo battery or regulated 5V
supply.

R1 should be populated with a resistor to control the current flow
through each LED. The value of R1 is calculated from R1 = 936 kΩ / I,
where I is the desired maximum LED current. The minimum value of R1 is
39 kΩ, corresponding to I = 24 mA. (See MAX6957 data sheet)

A switch (S1) is used to change the resistor used for the LED circuit,
since the power supply is routed directly into the LED anode, and the
voltage needs to be stepped down to either 3.2V or 2.1V, depending on
the specific LED. Both R3 and R4 should be populated, with the resistor
values matching the LEDs installed on the board.

The board uses both SMD and through-hole parts.

This version can also be driven by a different micro controller by
dropping connections into the “EXT_MICRO” headers.