Datasheet

4) Servo Headers

The servo ports connect servos and other 3-pin devices to Propeller I/O pins, labeled above each port.

Labels indicating the GND (ground) and PWR (power) pins for each port are along the right.

Each pair of servo ports has a jumper on power-select pins to its immediate left. When the power switch

is in the '0' or '1' position, or the port’s power-select jumper is removed, the port will not provide power.

If the jumper is inserted, the port will provide power while the power switch is in the '2' position.

Each jumper can set the power voltage of the port pair to 5 volts, by placing the jumper over the pair of

pins closer to the 5V label, or to unregulated input voltage from the 2.1 mm barrel jack, by placing the

jumper over the pair of pins closer to the VIN label.

If excessive power draw is present at any jumper position, the board may temporarily disconnect power

and automatically reconnect it. Depending on the operating conditions, the Propeller Activity Board WX

will disconnect VIN power when a load reaches a point between 1.5 and 3 amps for Rev A, and between

1.85 and 3 amps for Rev B.

CAUTION: For servos and other high-current devices, use VIN and an external power supply; see

2) Power Jack, p. 2 for details. The supply must not exceed the input voltage rating of your device.

CAUTION: Do not attempt to drive servos or other high-current devices from USB power. This may

cause the Propeller Activity board WX to reset, and could be detrimental to some computer systems. See

section 15) USB Port, p. 5, for details.

CAUTION: When using servo ports set to 5V, be sure the total current load does not exceed the 5 V

regulator’s maximum rated current. See section 3) 1.8 A Voltage Regulators, p. 2.

5) 3.3V / 5V Power Access

The positive 3.3 V and 5 V supply sockets are positioned along the top of the breadboard. Use jumper

wires to connect these sockets to circuits you build on the breadboard. See 3) 1.8 A Voltage Regulators,

p. 2, for information about how much current can be supplied through these sockets.

6) Breadboard

This breadboard has 34 5-socket rows arranged in 2 columns. The columns are separated by a valley in

the middle. Any two wires plugged into the same 5-socket row become electrically connected. The

socket spacing is 0.1”.

7) GND, D/A, A/D Access

• GND access sockets — use jumper wires to connect these sockets to circuits on the breadboard.

• Digital to Analog access sockets — D/A 0, 1

o Output voltage range: 0 to 3.3 V

o D/A 0 is the digital to analog voltage from P26 after it has passed through a low-pass

filter and buffer amplifier (but before it has passed through the coupling capacitor to the

stereo output jack’s right speaker channel).

o D/A 1 is the same as D/A 0, but the duty modulated signal is provided by P27.

• Analog to Digital access sockets — A/D 0, 1, 2, 3

o Input voltage range: 0 to 5 V. See 9) Analog/Digital Converter, p. 4, for details.