Components Required

The following component needed for this tutorial.

• Arduino Uno
• 2 Common anode 7 segment display
• 74hc595 shift register
• 220-ohm resistor
• Breadboard
• Some jumper wire
  

Pin Configuration

Fig: Common anode 7 segment display pinout

Fig: 74hc595 pinout

Circuit Schematic

The following figure shows the 7 segment display multiplexing with 74hc595 shift register using Arduino.

Fig: 7 Segment display multiplexing

Circuit Description

The shift register has 16 pins in which 7 output pins will connect with 7 segment LEDs pin. The shift register Vcc pin 16 and MR pin 10 will connect to +5V.  The ground pin 8 and output enable pin 13 will goes to ground. Next, shift register clock, latch, and data pins are gradually 11,12 and 14 will connect to Arduino digital pin 2, 3 and 4 respectively. Seven segment display common pins will connect to Arduino digital pin 6 and 7 through the 220-ohm series resistor.   

7 segment display ----------------- 74hc595 shift register

Pin_7(Seg_a)    ---------------          Pin_15(Q_A)

Pin_6(Seg_b)    ---------------          Pin_1(Q_A)

Pin_4(Seg_c)     ---------------          Pin_2(Q_A)

Pin_2(Seg_d)     ---------------          Pin_3(Q_A)

Pin_1(Seg_e)     ---------------          Pin_4(Q_A)

Pin_10(Seg_f)     --------------         Pin_5(Q_A)

Pin_9(Seg_g)     --------------          Pin_6(Q_A)

Source Code

Overview

In this Arduino tutorial, we will learn how to interface common anode and cathode 7 segment display with Arduino. 7 segment display is most common and popular display to show the number in the digital electronics and embedded system. It can be displayed in 0 to 9 decimal number.  They are easy to use and cheap. 7 Segment displays are two types of display called common cathode (common negative) and common anode (common positive).

Components Required

• Arduino Uno
• 7 Segment Display Common Anode
• 7 Segment Display Common Cathode
• 220-ohm resistor
• Breadboard
• Some jumper wire

7 Segment Pinout

Fig: 7 segments display pinout

Circuit Schematic

The following figure shows Arduino and the common cathode 7 segment display interfacing.

Fig: 7 segments common cathode display interfacing

The following figure shows Arduino and the common anode 7 segment display interfacing.

Fig: 7 segments common anode display interfacing

Circuit Description

Both types of seven segment display internal connection are nearly the same. The difference is the polarity of the LEDs and common terminal. In a common cathode display, we need to connect common pins to ground and others pin to +5V. Alternatively, in a common anode display, we need to connect common pins +5V.

Arduino--------------------Seven Segment

Pin_1     ----------------   Pin_7 (Seg_a)

Pin_2     ----------------   Pin_6 (Seg_b)

Pin_3     ----------------   Pin_4 (Seg_c)

Pin_4     ----------------   Pin_2 (Seg_d)

Pin_5     ----------------   Pin_1 (Seg_e)

 Pin_6     -----------------  Pin_10 (Seg_f)

Pin_7     ----------------   Pin_9 (Seg_g)

Source Code

Overview

In this tutorial, we will learn how to interfacing 4*4 keypad with Arduino by a single analog pin. The use of a lot of pins can be reduced by following this procedure. It helps to use rest of pins for another purpose. For this tutorial, we will use a single analog pin to interfacing keypad with Arduino. 

You can watch the following video below:-

Components Required

Keypad Pinout

Fig 2.1: 4*4 Keypad Pinout

Circuit Schematic

The given below schematic is single wire keypad with Arduino:- 

Fig 3.1: One wire keypad with Arduino

Circuit Description

Fig: 4.1

Fig 4.2: One wire keypad with LCD using Arduino

Source Code

Overview

In this Arduino tutorial, we will learn how to make an audio player using Arduino and SD card module. Any kind of micro-controller project will look cool and interesting when we adding sounds. We can easily interfacing SD card module and Arduino. Also, we have easily found some Arduino libraries. 

You can watch the following video below:-

Components Required

The required components list for this project given below:-

• Arduino Uno
• Micro SD card Adapter
• Micro SD card
• Card Reader
• Speaker with 3.5mm jack output
• Some Jumper wire

Convert Audio to .wav Format

If you want to play any audio file with Arduino you must need to convert the audio in wav format because Arduino can play through SD card module an audio file in a specific format. Now follow the below procedure to convert an audio file in wav format.

1. Go to the link: https://audio.online-convert.com/convert-to-wav 
2. Upload your audio you want to convert to WAV
3. Set bit resolution: " 8bit ".
4. Change sampling rate: " 16000Hz ".
5. Fixed audio channels: " mono ".

Next click on "Convert file" and download the file.

Circuit Schematic

The circuit schematic of audio player given below:-

Circuit Diagram

Circuit Description

SD card module has six pins whose Vcc and GND pin will connect with arduino 5V and GND pin respectively. Next comes to MISO, MOSI and SCK pin which use for SPI communication with arduino. These pin will connect with arduino digital pin 12 , 11 and 13 respectively. Last one CS pin will connect to digital pin 10.

3.5mm Jack

After that arduino digital pin 9 will connect to sleeve end of the speaker 3.5mm jack. Tip end of the speaker jack will go to the ground pin of the Arduino.

Source Code

The source code given below:-

You can download the library here: https://github.com/TMRh20/TMRpcm

Overview

Components Required

The required components list for this project given below:-

•  Arduino Uno
• 16*2 LCD Display
• 74HC595 Shift Register
• 10k Potentiometer
• 220-ohm Resistor
• Bread Board
• Some Connecting Wire 

LCD Pinout

74hc595 Shift Register Pinout

Circuit Diagram

Circuit Description