PERANCANGAN DAN REALISASI PROTOTIP ALAT VALIDASI KOIN BERBASIS MIKROKONTROLER 80C32

• Main Author: Sakriyani, Sridewi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/4521
• Institution: Institut Teknologi Bandung

<b>Abstract :</b><p align=\"justify\"> <br /> In this thesis a coin validator prototype has been designed and realized based on 80C32 microcontroller. The main componentsfor the coin detection are a pair of ferrite core with a kind of pot-core, four infra red LEDs and 8 photodiodes. Other necessary components are an 8 bit analog to digital converter (0804 ADC), an 8 kbytes 27C64 EPROM, 74HCT373 latch, TM161A LCD display, a solenoid, a keypad, and 5V & 26V solenoid power supplies. <p align=\"justify\"> <br /> There are two different microcontroller programs that have been designed and realized in this thesis, that is an identification program and a coin validation program. The identification program requires 1499 bytes from the 8 kbytes 27054 EPROM. In this program, coin material/thickness data and size data occupy 128 bytes in 80C32 internal data memory. Each type of coin requires 5 bytes of memory location. Therefore, the system can identify 25 different types of coins. In addition, coin validation can also be carried-out by the identification program. The validation program requires 852 bytes of memory from the 27C64 EPROM. In this program, data obtained from the identification process are stored in the EPROM as a look-up table. Each program is stored in a separate 27C64 EPROM memory. <p align=\"justify\"> <br /> The coin validator prototype has been tested for Indonesian coins and a number of foreign coins. From the results, it can be concluded that this prototype can successfully validate 16 kind of Indonesian coins with current consumptions of 45 mA and 40 mA in active and non active conditions respectively. Further development can be done using CMOS version microcontroller which has an on chip EPROM, an on chip ADC, and using a solenoid which requires very low current so that the overall current consumption can be reduced as low as possible. In conclusion, the coin validator prototype has fulfilled the requirement of a working laboratory prototype.