VIEWER SYSTEM COST PHONE USE IN CONJUNCTION WITH MICROCONTROLLER AT89S51
Denny Divayana(Alumni 2006)
Dosen Pembimbing :
Pembimbing 1 Drs. Jusuf Bintoro, MT
Pembimbing 2 Muhammad Yusro,SPd, M.T
This research aim to make display of telephone cost on a house which have some occupant, such as boarding house, with exploit microcontroller AT89S51. This research conducted in Electronic’s labolatory of major Technique electro, Faculty of Technique, State of Jakarta University, at anomalous semester, year of academic 2005/2006 with labolatory experiment method.
This research use DTMF decoder, hook detector, ring detector and keypad as input, microcontroller as the processor, and also LCD and Chip Corder ISD as output. Keypad used as input for password and chosening menu, its connected on 3rd port microcontroller, hook detector as the detector condition of telephone’s hook for begin the input password and start the phone call that conect at 1.6th microcontroller port , DTMF decoder give the input of pressed phone number on the port 1.0th – 1.3th, afterwards detected as lokal number or SLJJ number and counter the appropriate on rate. LCD will display information of date and time, select menu and display phone number and amount of telephone cost for each user. Chip corder ISD produce a sound message which used by user to guide them when operate the device.
The result show that Cost Telephone Display With Common User System operate with correctly, indicated with LCD can display the data that require and count the cost telephone, also produce some sound message as guider from ISD.
Keyword: telephone, microcontroller, DTMF, LCD, ISD