1. PWM outputs - Each PWM channel has a three-pin, 0.1" spaced

header footprint. The output order is appropriate for most servo

motors. All you need to do is add male header pins, and you can

connect servos directly to the block. The VIN pin is, by default,

floating. Before you can drive a servo, you’ll need to provide power

to that rail.

2. Auxiliary Power Input - These pads are provided to allow you to

connect an external power supply to the PWM channels. This allows

you to use a higher voltage, higher current supply (for instance, a

7.2V 2S LiPo cell) to power the devices connected to the PWM

outputs without risking damage to the Edison.

3. VSYS->VIN jumper - If you don’t need the extra oomph of an

external power supply (because you’re driving small LEDs or a small

servo, perhaps), you can bridge this jumper with a solder blob to

draw power from the Edison VSYS rail. When running from USB, you

can expect that rail to be approximately 4.0V.

4. Address jumpers - These jumpers allow you to set the address the

PCA9685 PWM chip on this board will use. Each jumper corresponds

to a single address bit; closing a jumper makes that bit a ‘1’. The

default address is 0x40. Thus, closing A0 would make the address

0x41, A1 makes it 0x42, A0 and A1 make it 0x43, and so on.

The “back” of the board is far more boring, with no jumpers or components

to mention. This is the side that the Edison module will mate with, so you

will be able to change jumpers without detaching the Edison.

Using the PWM Block

To use the PWM Block, simply attach an Intel Edison to the back of the

board, or add it to your current stack. Blocks can be stacked without

hardware, but it leaves the expansion connectors unprotected from

mechanical stress.

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