Microprocessor Systems & Interfacing (EEE-342)
Lab # 11 Serial Communication with UART and
Interfacing Bluetooth HC-05
Name Arslan Shabeer
Registration Number FA20-BEE-033
Class BEE-5A
Instructor’s Name Sir Sikandar Gull SB
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Microprocessor and interfacing Lab Report 01, Study Guides, Projects, Research of Microprocessors
This is the Lab 01 of Microprocessor of Comsats University Islamabad
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2022/2023
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Microprocessor Systems & Interfacing (EEE-342)
Lab # 11 Serial Communication with UART and
Interfacing Bluetooth HC-
Name Arslan Shabeer
Registration Number FA20-BEE-
Class BEE-5A
Instructor’s Name
Sir Sikandar Gull SB
Objectives:
To implement serial communication using UART of Atmega328p
To establish Bluetooth connectivity between Atmega328p and an Android mobile device.
Pre-Lab: Serial Communication:
Microcontrollers must often exchange data with other microcontrollers or devices. Data may be
exchanged by using parallel or serial communication links. With parallel techniques, an entire
byte of data is typically sent simultaneously from the transmitting device to the receiver device.
Although this is efficient from a time point of view, it requires eight separate lines for the data
transfer. In serial transmission, a byte of data is sent a single bit at a time. Once 8 bits have been
received at the receiver, the data byte is reconstructed. Although this is inefficient from a time
point of view, it only requires a line (or two) to transmit the data.
In Lab: Task 1:
You will configure (i.e. set baud rate, frame format, parity settings etc ) UART present in
Atmega328P for Asynchronous Serial Communication. The rest of the code implements the
transmit and receive functionality and uses them in an echo back mechanism. This means that
the program waits for any data received on the UART receiver and then transmits it back.
SOLUTION:
Code:
#include <avr/io.h> // Most basic include files #include <avr/interrupt.h> // Add the necessary ones #include <util/delay.h> #include <string.h> #define F_CPU 16000000UL // a System clock of 16 MHz // ************** Definistion for USART ********************** #define BAUD 9600.00 // Baud Rate Declared as a float #define UBRR_VAL ( F_CPU /(16*BAUD))-1 // Corresponding UBRR Value //
void USART_Init(unsigned int ubrr); // function to Initialize the USART void USART_Transmit(unsigned char data); // Transmit Data via USART unsigned char USART_Receive(void); // Receive Data via USART void USART_send_str(char * string1); // Transmit a string void USART_read_str(char * ); // Read the USART buffer // ***********************************************************
ch = USART_Receive(); unsigned char i; str[i] = ch; } while(ch != '\0'); } Proteus Simulation: Task 2: Interfacing HC-05 Bluetooth device and Communicating with an Android Device
HC-05 is a module that is used to provide Bluetooth wireless connectivity to your
microcontrollers. HC-05 has a close cousin, the HC-06 also available in the market. Both devices
are Bluetooth transceiver modules but HC-05 can operate both as a Master or a Slave device
whereas HC-06 can only operate in the Slave mode. A Bluetooth master device can look for other
BT devices and then make a connection with them (called Paring in BT terminology). It is
recommended that you get an HC-05 device since the price is the same for the two modules.
Following figure shows the two modules side by side. The HC-05 has 6 pins compared to 5 pins of
HC-06.
Figure 11.4 HC-05 and HC-
Once paired with a device, the HC-05 acts as a communication bridge between the
microcontroller and the connected device.
Interfacing HC-05 with Arduino Nano
The following figure shows the electrical interface between the HC-05 and Arduino Nano. HC-
05 is powered from the 5V and the GND pins of the Arduino, the TX and RX pins of the module
are connected to D8 and D9 of the Arduino board.
Figure 11.5 Interfacing HC-05 with Arduino Nano
HC-05 and HC-06 operate in two modes.
1. Command Mode or AT mode
2. Communication Mode
Command mode is used to set configuration of the Bluetooth module (HC-05/06). These
configurations include baud rate , password , role (master/slave), address (unique for different
modules) etc. To start the module in this mode press and hold down the button on the corner of
the module when powering it. You can tell that the module is in communication mode by the
blinking of its LED. In communication mode, the LED will blink with a period of about 4 seconds.
The commands that can be issued to module are listed in the following link.
Critical Analysis / Conclusion: