Transcript SECO Secure Electronic Communications for Offices Cycle 1

Cycle 1 Accomplishments
 Cycle 1 Obstacles
 Box Design Changes
 Fingerprint Scanner Interface
 Locking Mechanism Design
 Motion Detector System
 Cycle 2 Goals

Individual hardware components for one
complete mailbox
 A working motion detector to identify
mail
 Lock opens and closes with different
input signals
 Lock and motion detector have been
tested with sbRIO and software
 Initial programming to facilitate overall
control and component communication


Development sbRIO did not function properly
and actual sbRIO delayed until mid-October
› Replacement sbRIO is scheduled to arrive this week

IR Transmitter did not have a strong signal for
motion detector
› Found a different transmitter that provides a better
LED

Fingerprint scanner has a complicated
datasheet and has been tedious to wire
› Care is being taken to fully understand the
functionality of the scanner board and crimping
terminals were purchased for ease of connection
Made of Plexiglas
 Mailbox dimensions 13 3/4” x 11 1/8” x 7 3/4”
 Smaller door that folds down
 Mail slot above door
 Lock and motion
detector above door


9 pin connection required for operation
of fingerprint scanner

Default input and output settings ideal
for this application
No complete serial bus is available from
manufacturer for connection
 Connection can be constructed

Crimp
Housing
Crimp
Terminal

Better option is to
salvage alreadycrimped wires from
another crimp
housing of different
size and plug them
into 9-pin housing

Implemented recommended circuitry for
interface between 9-pin connector and sbRIO

BJT Switch
› High signal from sbRIO 
12V across lock = OPEN
› No signal from sbRIO 
0V across lock = CLOSED
Locking Mechanism LabVIEW FPGA Code





Emitter sends
infrared light
Detector collects
infrared light
Voltage measured
after detector
No blockage,
Vo = 0.2V
Blockage,
Vo = 4V
Motion Detector LabVIEW FPGA Code
Get sbRIO here and operating
 Secure mailbox built
 Lock override in place
 Fingerprint scanner working properly
 Email system setup to send email when
mail is placed in mailbox
 SECO should be fully functional!
