Developing a microcontroller controlled Wetting balance measuring device

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Supervisor:
Dr. Krammer Olivér
Department of Electronics Technology

In order to keep up the sustainable development of electronics technology it is necessary to impress the technology methods continuously. However it is required to classify the result quality of these methods. Current thesis deals with one of these methods in particular called Wetting Balance test. The test is used to measure the soldering’s most significant parameter called wetting ability. In this semester I designed an instrument that can measure this parameter and store the obtained results.

In order to implement this I performed literature research about Wetting Balance as well as the components of constructing the instrument. These components are DC stepper motors, force transducer sensors and microcontrollers to manage controlling.

To plan the controlling I analyzed the construction, the nature and programming of microcontrollers. In addition I investigated the construction and actuation of peripherals used for planning. Finally I chose to use an 8-bits PIC microcontroller, called PIC18F67J50. This controller uses its inner CCP module to create PWM (pulse width modulation) signal to control the DC stepper motor which moves a solder container. The controller processes a dynamic force measurement by an analog, resistive load cell. The results are converted by a built-in 8-bit resolution analog-to-digital converter and saved to the microcontroller’s inner flash-type EEPROM memory. The saved data can be loaded by PICkit programmer via ICSP (In-Circuit Serial Programming) port.

In the course of planning I made an attempt for the future expandability of the equipment so it can be easily supplemented with additional peripherals or a secondary control unit. Furthermore I made an effort to design a clear controlling program.

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