The Relay based Multiplexer
© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Populate Common Parts
D1Back EMF dampener
 LED1
 LED2
 Output 3 pin header
 R1 470ohm
 R2 470ohm
 SW1 3 pin header
 SW2 3 pin header
 RL1 Relay

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Populate Sensor-MUX Qty4
R3 TBD
 R4 TBD
 R5 TBD
 R6 TBD
 R7 TBD
 R8 TBD

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Populate MUX main tree Qty3
SW1 3 pin header
 SW2 3 pin header

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Jumper Cables
© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Assemble the boards-Parts
3 SPST switch harnesses
 1-9v battery harness
 10-3 wire connectors
 4 Sensor boards
 3 standard boards

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Step one
© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE

Connect switch to topmost
board SW1

Connect SW1 to SW2 on next
board down

Continue on remaining 2 boards
Step 2
© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE

Connect switch to
topmost board SW1

Connect SW1 to SW2 on
next board down

Connect first row of
boards to second row as
shown
Step 3

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Connect
last board,
switch and
battery as
shown.
Activity 1
If a green light
indicates a zero,
 and a red light
indicates a one,
 What binary number
will select input E?
 What is that in
decimal?

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
Activity 2

What are the
binary numbers
for:
◦
◦
◦
◦

© 2010 Akula LLC,
Jeremy R. Hertzberg,
BS CMPE
A?
B?
C?
D?
What is the
decimal number
for H?