THIS IS THE COMPLETE MODULE WITH THE DTMF DECODER,RING DETECTOR,MOTHER BOARD AND THE UART PORT(DB-9)
THIS IS THE DTMF DECODER WITH MT8870 IC.WE HAVE 5 OUTPUT PINS HERE FOR DECODING.
PARO WITH THE DECODER WONDERING HOW SEXY IT LOOKS
GOMZY WITH A SMILE
THE POWER SOURCE
40 PIN MOTHER OF OUR PROJECT
OUR MOTHER BOARD GIVING US THE LAUNCH PAD FOR THE REST OF THE CIRCUITRY
ITS ME AGAIN
MY PROJECT PARTNER ASHWIN GOMES
FIRST SUCCESSFUL TEST EXECUTION OF THE MOTHER BOARD WHERE WE WROTE A SMALL CODE IN 8051 ASSEMBLY FOR RACING LIGHTS
HEY THATS ME WITH THE GUN IN THE BATTLE FIELD WITH MY TEENY MEENY CIRCUITRY
MY PROJECT PARTNER PARVINDER AND ME DOING SOME SERIOUS SOLDERING ; )
THE RING DETECTOR CIRCUIT THAT WE MADE AFTER MUCH SEARCHING AND RESEARCH. IT SENSES THE RING AND LED GLOWS GIVING A +5V SIGNAL AT ITS O/P THUS DRIVING AN I/O PIN IN OUR MICROCONTROLLER.
THE MOTHER BOARD WITH THE ATL89C51 MICROCONTROLLER WITH 8 LEDS DEPICTING THE DEVICES WITH A POWER REGULATION CIRCUIT OF +5 VOLTS.THERE IS UART CIRCUIT BUILT IN THE SAME BOARD USING MAX232 LINE CONVERTER
THIS IS THE DTMF DECODER WITH MT8870 IC. WE HAVE 5 OUTPUT PINS HERE FOR DECODING.
CIRCUIT DESCRIPTION MADE ON ORCAD CIS
THIS IS THE IVRS CONTROL CIRCUITRY WHICH WE COULD NOT IMPLEMENT SUCCESSFULLY DUE TO LACK OF EXPERT KNOWLEDGE
