Dilshan R Jayakody’s Web Log

Simtelic Music Module is a user-programmable module that uses RTTTL data to store and play melodies. EL0003 - Programmable music module. RTTTL , which stands for Ring Tone Text Transfer Language , was created to provide a simple, text-based format for sharing ringtones on early mobile phones. Developed by Nokia , it quickly became popular due to its compact size and compatibility with text messaging services. This format allowed users to easily exchange custom melodies without needing specialized software or data connections. RTTTL is a human-readable data format where each ringtone is represented as a sequence of notes, durations, and optional settings. According to Simtelic naming conventions, this module is identified as EL0003 and is available for purchase online. Top view of the EL0003 module. This module is built around a 32-bit MCU, a 2Kbit EEPROM, and a CH340 USB bus conversion chip. It is compatible with the latest Windows and Linux-based PCs. The module is user-fr...

In this project we design low cost high performance programmable home security system using few LDR’s as an input sensors. When above sensor(s) get triggered system may dial the user specified phone number (using build-in DTMF generator) and activate the high power audio alarm and lights. All the parameters of DTMF generator, audio alarm and light interface are programmed through the RS232 serial interface. Current firmware of this system presents interactive control system through the RS232 interface. This control system consist with the menu driven configuration options, self tests, system report generators, etc. This system also contain 5W (with 4Ω speaker) audio alarm with three selectable tone configurations, which include Police siren, Fire engine siren and Ambulance siren. This system uses a Microchip’s PIC16F877A as a main controller, LM339 as sensor interface, UM3561 as a tone generator and μPC2002 as a speaker driver (audio amplifier). LM7805, LM7812 and LM317 voltage...