Power

The Sedona Development Board may be powered from either the included DC 15V “wall wart” power supply or via four AAA batteries in the on-board battery holders. Selection of power source between external power supply and battery is made via an on-board jumper J2, “Power Source Select”.

A T-Slider power switch (SW6) switches power to the board. This controls the battery power or the power sourced by the external power supply depending on the position of J2, “Power Source Select”.

An LED D5 is provided to give the power status, indicating when power is switched on.

External power supply

An external power supply can be connected to the board using J8. The input specification is 15-18VAC or DC with a minimum supply current of 100mA.

To use the external power supply, set J2 (Power Source Select) jumper to EXT.

Batteries

Two banks of batteries (AAA types) can be mounted on the board. The two banks are in configured in parallel, so that the maximum VCC when running from batteries is 3.0V.

Filling either bank 0 or 1 will allow the board to operate. Filling both banks will extend the battery life of the board.

To use the batteries, set J2 (Power Source Select) jumper to BAT. When operating from the external power supply, J2 ensures that the batteries are isolated from the supply.