Midnight Syndicate wanted to control that remotely.
XBee modules include a bit of analog and digital I/O
that can be accessed using AT commands. What worked
out really well for this project — because we wanted to
keep the remote as simple as possible — is that a remote
XBee's I/O can be accessed even if it's not connected to a
What this meant is that we could create a remote
with just an XBee, a pushbutton, a potentiometer, a power
switch, and a set of batteries. Figure 6 is the diagram I
Yes, the device is supposed to look home-built and
kind of retro. Matt did a fantastic job of fabrication and
programming the prop. The display animation is
wonderful. In the works, he also used my WX28xx pixel
driver and a SEETRON OLED driver that I wrote for the
display he chose.
To access the remote, we use the Remote AT frame
type ($17) with a command string of “IS” (queried
■ FIGURE 6. XBee
■ FIGURE 7. Ghost Hunter prop and remote.
■ FIGURE 8. Remote AT test.
48 November 2017
Propeller PAB Parallax 32123
XBee module Parallax 32407/32419
Xbee XStick1 Parallax 28186
XBee USB adapter Parallax 32400
XBee adapter Parallax 32403
10K potentiometer Parallax 152-01031
Tactile switch Parallax 400-00002
10K resistor Digi-Key 10KQBK-ND
Breadboard Parallax 700-32023
Power supply All Electronics MB-PS
Propeller boards, chips, and
RF / XBee products