Arduino Logic Probe

This project is an instrument of measuring so that you can measure logic levels of voltage. That is, with an Arduino Uno, and a 3-digit common cathode display, you will probe logic levels as zeros and ones, even pulses. For obtaining the code, you can go to: http://pastebin.com/cCBQLDyU

What you will need:
Soldering iron and solder

Wire strippers and cutter

Needle nose pliers

Multimeter

22 AWG wire, 1 meter

1 Arduino Uno Proto Shield (PCB only)

1 ABS Plastic Enclosure for Arduino Boards - Fits UNO or MEGA

1 Displays Segmented Panel 3DIGIT 24LED Orange CC 12-Pin DIP

1 Arduino Uno R3 DIP Edition (Revision 3)

7 Resistor Carbon Film 220 Ohm 1/4 Watt 5%

1 Resistor Carbon Film 10k Ohm 1/4 Watt 5%

1 Connector Unshrouded Header 40 Position 2.54mm Straight Thru-Hole

1 Test Lead Red

1 Cable USB2.0 A/B 3 Feet Black USB-A Male To USB-B Male

1 9V Battery Snap with 2.1mm Barrel Plug

This is the project's general diagram where you see each connection for carrying out your project successfully. That is, it's an easy way of following the project and with it to avoid errors.

Observing carefully this Display, you will connect correctly the device because the corresponding pins are exactly the same, the picture and the component physically.

Installing the led display, you can realize how it is fitted perfectly in the PCB. This photo is to your help.

This picture describes how to make each connection to your display. In this side of the PCB, follow the instructions to avoid errors. Note the clear directions to connect correctly the 3-digit display.

With the step #5 and the help of the project's diagram, install and solder the resistors to your display and Arduino pins respectively.

This picture shows how to complete the rest of connections to your display. To complete this step, make the connections to the common display pins, d1, d2, and d3.

This picture shows how to connect the resistor of 10K to Arduino pin 10 and GND respectively. Also, the connection of GND to GND close to 5V pin on your PCB.

Taking the Connector Unshrouded Header 40 Position 2.54mm Straight Thru-Hole, cut the pins that you will need to install in the project.

Install the pins previously prepared in the step #9.

This picture shows the pins are already installed and soldered.

With this front view of your project, you can realize if everything is OK.

This picture shows how to prepare the test lead of your project.

This picture shows how to install the test lead.

In this front view of your project, you can verify if everything is OK with help of the schematic.

With this front view of your project, you can already think on an enclosure.

Mounting the project on the Arduino enclosure, you can already think about the code.

Upload the code so that you can use it to measure logic levels of voltage. Also note before measuring something, you will only see zeros because nothing is measured; and therefore, zero voltage is detected. For uploading the code, you can go to: http://pastebin.com/cCBQLDyU

Once uploaded the code, you can already measure logic zeros.

Once uploaded the code, you can already measure logic ones.