Wireless Chat Known as ChatBot

Overview

The ChatBot project is a set of wireless chatting terminals that use 128x64 graphics LCD and Ericsson Mobile keyboards.

Explanation

The device incorporates RS232 link and 433MHz wireless UHF. The RF communication ranges up to 100m with independent half duplex RS232 modem. The RS232 modem is raising the interrupt for main processor and uses an 8-bit port to exchange data.

There are 3 buffers with 30 Registers in each Character on main processor. The Local Buffer is used for saving the message before being sent. The Tx Buffer is used for saving the message of Local Buffer for Tx and the Rx Buffer for saving and displaying the Rx message. Two Windows are shown in the Chatting terminal where the Rx message from other user is shown in line 1 & 2 displays of the Upper Window and Tx message in line 3 & 4 from first user.

The Local Buffer saves the message typed by the first user that appears in lower window. The message is shifting in upper window after pressing the Enter key on keyboard. The message is queued for shifting in modem after clearing the lower window and local buffer.