Datasheet

8) D/A Activity Lights

These yellow LEDs give a visual indicator of the output voltage at D/A sockets 0 and 1. They also

indicate activity on the stereo output jack. The LEDs will vary in brightness with duty modulated digital

to analog signals.

9) Analog/Digital Converter

Use the Analog to Digital Converter to monitor the voltage at analog inputs A/D 0, 1, 2, and 3. It will

give a number from 0 to 4095, which tells what the voltage is in a range from 0 to 5 volts. The converter

used here is a 12-bit, 200 ksps SPI ADC, with a 5-volt supply reference.

10) Propeller I/O Pin Access

Access to Propeller I/O pins P0...P15. Use jumper wires to connect these I/O pins to circuits on the

breadboard, or to the WX wireless communication module access header.

NOTE: The accuracy of the 5 V supply will affect the accuracy of the D/A readings. 5 V power from a

USB port may vary by as much as ten percent. For more accurate readings, power the Propeller Activity

Board WX solely from the 2.1 mm barrel jack.

11) WX Wireless Access & Communication Header

The six-socket header labeled WX, to the left of the Propeller I/O pin access header, is the wireless access

& communications header. Use jumper wires between the two headers to connect Propeller I/O pins to

corresponding sockets on the wireless module socket:

• DO (data out)

• DI (data in)

• RTS (ready to send)

• CTS (clear to send)

The SEL socket makes it possible to override the Propeller Activity Board WX’s automatic mode, and

route serial communication for programming and default terminal communication through either the USB

connection or the wireless communication module socket. Here are the three ways the SEL socket can

be configured:

• SEL unconnected - Automatic

• SEL to 3.3V – Wireless Communication Socket

• SEL to GND – USB

The default mode when the SEL socket is left unconnected is automatic. For more info on automatic port

selection, see 15) USB Port, p. 5, and 19) WX Wireless Communication Module Socket, p. 6. For

information on the I/O pins the Propeller chip uses for programming and default terminal communication,

see P31 and P30 in the Propeller I/O Pin Assignments table, p. 7.

NOTE: When Rev A of the Propeller Activity Board WX is not connected to a USB host or charger, and the

Wireless Communication Socket is automatically selected, the automatic selection system may switch to

the disconnected USB input. This may prevent successful programming or interrupt communications.

When programming or communicating with Rev A, through the Wireless Communication Socket, when a

USB host or charger is not present, connect the SEL socket to 3.3V, to override the automatic selection.

IMPORTANT: When SEL is set for the Wireless Communication Socket, do not try to send signals from

an I/O pin to the DI socket because they will interfere with signals transmitted by the Propeller chip’s P30

I/O pin to the wireless module’s DI connection.