ATmega32 to PC Communication with LED Display
Several devices collect data from sensors and other input devices and these data needs to be sent to another devices, like a computer, for further processing. Data communication between two devices is generally done in two ways: parallel and serial. In the parallel communication, data transfer is fast and uses more number of signal lines. This mode is good for short range data transfer. Serial communication on the other hand, uses only one or two data lines to transfer data and is generally used for long distance communication.
There are many ways to interface microcontroller to computer; the easiest way is through serial port of computer. But the current generation PCs and Laptops do not have Serial Ports in them. So, we will use a USB to Serial Cable with computer. A USB to Serial Cable creates a virtual serial port in the computer. The communication between a PC and a microcontroller through serial port can be achieved by using USART protocol in asynchronous mode, MAX232 and a terminal software. USART is a full duplex communication protocol used to transfer data between two device serially, MAX232 is a level converter which converts the CMOS logic levels from microcontroller into RS232 logic levels of computer and vice versa. And the terminal software is used to send data from computer and to see received data in computer.
In this project, we will learn How to interface a PC with ATmega32 AVR microcontroller and How to send data from microcontroller to computer. Here, the ATmega32 microcontroller will send the string “ABLab Solutions www.ablab.in” character by character to the computer with a delay of 500 milli second between each character. After sending the above string, the microcontroller will send the carriage return to computer. The carriage return is sent to display next string or character in new line and the ASCII value of carriage return is 0X0D. The ATmega32 microcontroller will also display each character of the string “ABLab Solutions www.ablab.in” in the 1×8 LED array. The above process continues forever.
Softwares Required
- AVR Studio 4 Software
- WinAVR 2010 Software
- SinaProg Hex Downloader Software
- USBasp Driver
- RealTerm Terminal Software
- USB to Serial Driver
Hardwares Required
Name | Quantity |
AVR Trainer Board-100 with ATmega32 | 1pc |
AVR USB Programmer | 1pc |
12V, 1A DC SMPS Adaptor | 1pc |
RS-232 Driver Board | 1pc |
USB to Serial Cable-Y-105 | 1pc |
10 to 10 FRC Female to Female Connector | 3pc |
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