44
stranded hookup wire, and strip and tin the ends about 1/4 inch. As shown
below, solder one end of the twisted pair to pads “O” and “P” on the rear
upper corner of the front panel circuit board, and the other end to the
speaker. Either wire goes to either speaker terminal. Position the speaker
on the bottom enclosure cover, underneath the main circuit board; it will
be held in place by the speaker magnet.
Note: If you want to try out your
controller before you install a speaker, then you must temporarily solder a
1000
Ω
Ω
Ω
Ω
– 2.2 K
Ω
Ω
Ω
Ω
resistor between pads “O” and “P” to use as a load.
Otherwise your controller will exhibit erratic behavior.
The magnet in the miniature speaker holds it in place on the steel
bottom cover of the StationPro II enclosure
(12) Following the steps below, prepare a 4-conductor programming cable for your
StationPro II. This cable will connect between a serial port on your computer and the
program port P208 on the microcontroller circuit board.
Hint: If your computer does not
have a serial port, you can buy a USB-to-serial adapter from Parallax, Inc. (the company
that makes the Basic Stamp microcontroller) for $15. The item number is 28030 and the
website is www.parallax.com
(a) Cut a 5 ft length (approx) of 4-conductor cable. No shield is required, so
you can bundle lengths of hookup wire together if you don’t have 4-conductor
cable. Strip each end of the cable wires by about 1/8 inch.
Hint: You can save
yourself some time by purchasing a ready-made nine wire serial cable with a
molded female DB-9 connector on one end. Clip off and discard the connector
at the other end and then jump to step (e), below.
(b) Assemble the components of a 9-pin serial computer connector (Radio Shack
part numbers are given below):
9-pin D-Sub female connector with crimp terminals (p/n 276-1428)
9-pin shielded D-Sub hood (p/n 276-1513 or 276-1539)
(c) Crimp and solder a terminal onto the wires at one end of the 4-conductor cable.
If your cable has a shield, also attach a terminal to the shield. (Use needle-nose
pliers to crimp the wires.)