Teaching the Laws of Signs Kit
PART NO. 2221376
The device is based on a 2x4 decoder (74LS139) because this decoder shows a configuration that corresponds exactly in its inputs to
the combination of signs of the operations of multiplication and division while its outputs give a result to each combination of inputs.
Go to the following websites:
https://www.youtube.com/watch?v=lbvYyCkHG1k
http://www.instructables.com/id/Teaching-The-Laws-of-Signs-Kit/
Time required: 8 hours depending on experience
Experience Level: Intermediate
Required tools and parts:
Soldering Station
Solder Roll
Plastic Cable Clamps 1/2"
Foam Tape
Wire Cutter
Pliers
Bill of Materials:
Qty
Jameco SKU
Component Name
1
18893
High Class ABS Plastic Speedy Box Enclosure 6.0"L x 3.5"W x 1.9"D
It's important that this component be utilized because it has a structural function in the project.
1
2152438
Arduino Uno Proto Shield (PCB only)
This is a critical component so that the project functions correctly.
4
690700
Resistor Carbon Film 220 Ohm 1/4 Watt 5% (In Bags of 10 and 100)
This component regulates the current to each LED where it's connected.
1
2137756
Pass-Through Female Headers for Arduino Shields - 1x8 and 1x6 Position (2 each)
These components are part of the interface between the two PCB utilized in the project.
10
14277
LED MOUNTING HARDWARE,T1-3/4,CLEAR,STANDARD
This component is essential for the project.
1
222033
CABLE,USB2.0,A/A,6 FEET,BLACK,USB-A MALE TO USB-A MALE
A practical component for this project.
10
2128500
5mm Water Clear RGB LED - Common Anode
This is a vital component for the project
1
47466
QUAD 2-INPUT POSITIVE OR GATE DIP-14
An important component for this project
1
112214
Socket IC 14 Pin Dual Wipe Soldertail Low Profile 0.03 Inch Width
A necessary component for this project
1
301268
Decoder/Demultiplexer Dual 2-to-4 16-Pin Plastic Dip Tube
An indispensable component for this project
1
112222
Socket IC 16 Pin Dual Wipe Soldertail Low Profile 0.30 Inch Width
This component is necessary for the project.
1
76523
Toggle Switch Single Pole Single Throw (On-Off) (MTS101) Solder 125 VAC @ 5 Amp 1/4 Inch Mounting
This component is necessary for the project.
1
101566
Switch Rotary Shaft Solder Lug 25mm 10M 4 Position
An essential component for this project
1
419127
HEAT SHRINK TUBING,FIT-221B-1/16-BLACK,4 FEET,BLACK POLYOLEFIN
This component is a good help for the project.
1
102788
KNOB,1/4 INCH SHAFT,POINTER,WITH SET SCREW
This component is necessary for the project.
1
2187876
10 Color Stranded Wire Kit Assortment
Component almost indispensable for this project
1
2214555
Breadboard Jumper Wire-One Pin Male to Male 15cm 10pcs
This component is necessary so that the project be done the best possible.
Step 1 - Bill of Materials
1
1
4
1
10
1
10
1
1
1
1
1
1
1
1
1
1
High Class ABS Plastic Speedy Box Enclosure 6.0"L x 3.5"W x 1.9"D
Arduino Uno Proto Shield (PCB only)
Resistor Carbon Film 220 Ohm 1/4 Watt 5% (In Bags of 10 and 100)
Pass-Through Female Headers for Arduino Shields - 1x8 and 1x6 Position
(2 each)
LED MOUNTING HARDWARE, T1-3/4, CLEAR, STANDARD
CABLE, USB2.0, A/A, 6 FEET, BLACK, USB-A MALE TO USB-A MALE
5mm Water Clear RGB LED - Common Anode
QUAD 2-INPUT POSITIVE OR GATE DIP-14 (74LS32)
Socket IC 14 Pin Dual Wipe Soldertail Low Profile 0.03 Inch Width
Decoder/Demultiplexer Dual 2-to-4 16-Pin Plastic Dip Tube (74LS139)
Socket IC 16 Pin Dual Wipe Soldertail Low Profile 0.30 Inch Width
Toggle Switch Single Pole Single Throw (On-Off) (MTS101) Solder
125 VAC @ 5 Amp 1/4 Inch Mounting
Switch Rotary Shaft Solder Lug 25mm 10M 4 Position
HEAT SHRINK TUBING, FIT221-1/16-Black, 4 FEET, Black POLYOLEFIN TUBING
KNOB, 1/4 INCH SHAFT, POINTER, WITH SET SCREW
10 Color Stranded Wire Kit Assortment
Breadboard Jumper Wire-One Pin Male to Male 15cm 10pcs
Step 2 - Working With the Enclosure of Your Project 1
In this step, you need to make a few holes: ones of 1/4" and another one of 3/8"
Step 3 - Working With the Enclosure of Your Project 2
It´s important that this drill be made so that you can install the switch
to turn (ON/OFF) your project. Note that this hole is 1/4”.
Step 4 - Completing the Holes in the Front Panel
It´s imperative that this hole be made so that you have all of holes
you need for the project. This hole is to pass through the enclosure the USB-A cable.
Step 5 - LED MOUNTING HARDWARE, T1-3/4, CLEAR, STANDARD
This hardware is a support for installing the LEDs used in the project,
and so showing a better presentation. In the current step, it´s necessary
to install 10 sockets of this type where will be inserting the RGB LEDs.
Step 6 - Diagram 1
In the diagram 1, you can see the changes in the combination of inputs and outputs by observing the inputs (0, 0) Minus, Minus for an
output (+) Plus while the black and orange wires are respectively GND and +5V.
Step 7 - Diagram 2
.In the diagram 2, you can see the different combination of inputs and outputs and also the use of black and orange wires for doing the
connections.to GND and +5V respectively where you can observe the inputs (0, 1) Minus, Plus for an output (-) Minus.
Step 8 - Diagram 3
In the diagram 3, you can observe the changes in the combination of inputs and outputs but also can note that the black and orange
colors are the wires used to do the connections in the rotary switch by representing the zeros and ones respectively. In this diagram is
observable the inputs (1, 0) Plus, Minus for a result (-) Minus...
Step 9 - Diagram 4
In the diagram 4, you can see the changes in the combination of inputs and outputs by observing the inputs (1, 1) Plus, Plus for an
output (+) Plus.
Step 10 - Working With RGB LEDs 1
Before using the RGB LEDs, take 6 RGB LEDs and check them by
using a multimeter for verifying their quality either good or bad.
Also cut the blue terminal of each RGB.
Step 11 - Working with RGB LEDs 2
Once checked the 6 RGB LEDs, insert them into the sockets previously
installed where you can use Heat Shrink Tubing. Note that you should insert
each LED with its red end toward bottom and for forming a line will be matching
each color terminal of these RGB LEDs without blue terminal by interconnecting
each group of 3 LEDs with their respective color terminal.
Step 12 - Working with RGB LEDs 3
Before connecting the 4 RGB LEDs, you can use Black
Heat Shrink Tubing in each terminal of these LEDs if want.
Step 13 - Working with RGB LEDs 4
For this step, you can use orange wire for interconnecting the
two groups of 5 LEDs and their common anode terminal. Also
interconnect the rest of the common anodes of each LED except
the green terminal of the bottom LEDs...
Step 14 - Working with RGB LEDs 5
Now, interconnect the missing green terminals of the bottom
LEDs and use green wire for these connections if want.
Step 15 - Installing the Toggle Switch ON/OFF
Install The Toggle Switch ON/OFF and connect an orange wire to
one of its terminals while the other end of the orange wire to common
anode of the RGB LEDs.
Step 16 - Preparing the Jumper Wires 1
Take 6 Jumper Wires Male to Male by thinking in the colors
that you want to use in your project and cut them in two same parts
and reserve for the following step.
Step 17 - Preparing the Jumper Wires 2
Cut wires for preparing your jumper wires male to male. In this step, I’m
preparing 2 green wires and 2 red wires for each group of RGB LEDs for
being connected to their green and red terminal respectively. Also prepare
1 white wire and 1 brown wire for being connected to the 2 poles of your
rotary switch, to A0 and A1 respectively.
Step 18 - Working with RGB LEDs 6
Of the jumper wires previously prepared in the step 17, connect the
green and red wires of each group of RGB LEDs. From the left group,
draw the wires for connecting to pin 10 the red one and to pin 11 the
green one while from the right group, will connect to pin 8 the green
one and to pin 9 the red one. For the rest of the wires, you should
reserve until new instructions. .
Step 19 - Working with the Rotary Switch 1
For working with the rotary switch 2 poles, 4 positions, you should
check it so that you can know where is each position of each pole
and so you do the connections correctly. In the connections done
in the rotary switch, you can observe orange and black wires for
the 4 positions. Also note that the 2 poles represent the 2 inputs of
your project (A0 , A1 read from left to right) while the 4 positions
represent the combination of inputs, that is, the black wires are 0´s
and the orange wires are 1´s and these combinations of inputs in
the left side comes up to down, but the right side comes down to up.
Step 20 - Working with the Rotary Switch 2
Connect the white and brown wires to the poles of your rotary
switch by connecting to A0 and A1 respectively while the black
and orange wires should be connected to GND and +5V respectively.
Step 21 - Preparing the USB-A Cable 1
Take the CABLE, USB2.0, A/A, 6 FEET, BLACK, USB-A MALE TO USB-A MALE
\and cut one of its ends so that you can only leave the red and black wire that
are +5V and GND respectively while removing the other two wires.
Step 22 - Working with the Rotary Switch 3
Using the USB-A cable prepared in the previous step and without forgetting
pass it through the enclosure, do a node to support it inside of the box and
connect it in your rotary switch to GND and +5V the black and red wire
respectively. Besides that, draw an orange wire of your rotary switch for using later.
Step 23 - Working with the Rotary Switch 4
In your enclosure, install the rotary switch by adjusting perfectly
the USB-A cable previously passed through the hole done in this and
without forgetting connecting the extra orange wire that should be
connected to the toggle switch ON/OFF.
Step 24 - Preparing the USB-A Cable 2
In this step, you are going to install a holder cable so that you can
support the knot done previously in your USB-A cable. Here I´m using a
plastic adjusted holder of 1/2" with an adhesive base for fixing perfectly
inside the box.
Step 25 - Working with the PCB 1
In this step, you are going to install the socket for the 74LS139 and 74LS32
then you need to install IC socket:: one of 14-pin and other of 16-pin. Also do the
connections from these sockets to GND and +5V and connect the resistors
by using black heat shrink tubing if want.
Step 26 - Working with the PCB 2
Do the rest of connections and install the Pass-Through Female Headers
for Arduino Shields -(2) 1x8 and (1) 1x6 Position.
Step 27 - Working with the PCB 3
Now, you can insert the integrated circuits: 74LS139 and 74LS32
Step 28 - Working with the PCB 4
Connect the red and green wires to pins 8, 9, 10, and 11 while
orange and black wires to +5V and GND respectively by installing also
white and brown wires to A0 and A1 in that order.
Step 29 - Power Switch
You can also use a few foam tape close to the power switch so that
you can write ON and OFF and so control the power of your project.
Step 30 - Completing the Project
To complete the project, you can use a few foam tape in the scale
and so representing the combination of signs that you will want to
select in this interesting project.
Step 31 - Using the Project 1
The laws of the signs of multiplication and division in their first
combination: minus, minus (- -) will result in a positive sign (+).
Then select the first scale: minus, minus (- -) so that you can
observe the result: plus (+)
Step 32 - Using the Project 2
The laws of the signs of multiplication and division in their second
combination: minus, plus (- +) will result in a negative sign (-). Then
select the second scale: minus, plus (- +) so that you can observe
the result: minus (-).
Step 33 - Using the Project 3
The laws of the signs of multiplication and division in their third
combination: plus, minus (+ -) will result in a negative sign (-).
Then select the third scale: plus, minus (+ -) so that you can observe
the result: minus (-).
Step 34 - Using the Project 4
The laws of the signs of multiplication and division in their forth combination:
plus, plus (+ +) will result in a positive sign (+). Then select the forth scale:
plus, plus (+ +) so that you can observe the result: plus (+).