This project is a programmable encoder because its functionality depends on an Arduino Uno and its suitable code. Since the project is an encoder generates the numbers from 0 - 9, it'll also need a common cathode display and some switches for showing its practical use. Because this programmable encoder is ideal if you want to learn to manipulate switches in an Arduino environment, it'd be recommended its lecture and analysis so that you can better your projects with this new knowledge if this knowledge is unknown for you. Also, knowing about coding switches give you an extra skill for developing much more projects and ideas that you have. Then, for uploading the code, go to: http://pastebin.com/b6iUs1bh

Important Note:

If your project is dependable switches one, this this project is a good option so that you can begin or continue learning about manipulating switches in an Arduino environment.

What you will need:
Soldering Iron Solder

Wire #22 (5m)

Nose pliers

Wire cutter

9 Volt Battery

Step 1: List of Materials

1 Arduino MEGA Protoboard PCB (Rev3)

1 Arduino Uno R3 DIP Edition (Revision 3)

1 Red Common Cathode Display 697nm LHDP/RHDP

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

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

11 Switch Push Button Tactile Single Pole Single Throw Off Momentary (On)

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

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

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

Step 2: Schematic Diagram

The schematic diagram shows clearly how to connect the switches and the common cathode display to the corresponding Arduino pins.

Step 3: Identifying the Common Cathode Display

This step shows the corresponding CC display pins from A to G.

Step 4: Installing the Common Cathode Display

Once installed the CC display in the PCB, identify the corresponding pins form A to G so that you can connect them correctly later.

Step 5: Connecting the Resistors to CC Display

Connect the 7 resistors of 220 Ohm to your common cathode(CC) display and Arduino Uno respectively and according to the connections showed in the photo. That is, the resistors are connected between Arduino Uno and the CC display pins and you shouldn't also forget the connection to GND from CC display pin 16.

Step 6: Install 10 Resistors of 10k

Install 10 resistors of 10K without forgetting the common connection to GND while leaving free the remaining leads of those resistors installed.

Step 7: Install the 11 Switches

Once installed the 11 switches, define and mark each switch with its respective number so that you can identify them. That is, you will have a keyboard from 0 to 9 and Clear.

Step 8: Connecting the Switches to +5V

Each switch should be connected to +5V, so you need to take a pin of each switch to be connected to +5V while the remaining pin of each switch will be connected to an Arduino pin and a resistor of 10K respectively.

Step 9: Connecting the Switches: Clear, 9, and 8

Connect the switches marked with a clear, 9, and 8 to D3, D4, and D5 Arduino pins respectively.

Step 10: Connecting the Switches: 7, 6, 5, and 4

Connect the switches marked with the numbers: 7, 6, 5, and 4 to D6, D7, D8, and D9 Arduino pins individually.

Step 11: Connecting the Switches: 3, 2, 1, and 0

Connect the switches labeled with a 3, 2, 1, and 0 to D10, D11, D12, and D13 Arduino pins respectively.

Step 12: Connecting the 11th Resistor of 10K

Once connected the 11th resistor of 10K and without forgetting the connection to GND also, draw connections from the remaining leads of the 11 resistors of 10K now to D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, and D13 Arduino pins individually.