| Summary: | 碩士 === 國立臺灣科技大學 === 自動化及控制研究所 === 103 === In this thesis, we present three methods to implement a 3D printer without using any microcontroller. The output signal is decoded to 24bits signal from computer which could directly drive stepper motor, or converted into analog signal to drive MOSFET to achieve frequency modulation to drive heating element by using DAC with amplifier, in addition, analog signal acquisition from reading partial voltage of temperature element by using ADC with latche and be delivered to the computer terminal. Therefore, by the decoding manner of these additions, we find that it would achive thermal controlling, temperature capturing and stepper motors driving. Furthermore it could replace the control board of 3D printer in order to fulfill the aim of a 3D printer without using any microcontroller.
The results indicated when we using signal decoded of RS232 in the Exp.1 and Exp.2, we would able to print object, despite the signal dislocation in the signal control process influncing control signal jitter, In the Exp.3, we use computers to control output signal directly, so the control signal is stable. We find the frequency of control signal is higher than the standard control signal of printing circle column object with commercial 3D printer, this method is umcompicated to achieve the demand of normal print speed.
In this thesis, the control methods can be realized to change the printing parameters of 3D printer, to design out a leaner, more flexible, lower cost, higher reproducibility and can avoid a number of commercial 3D printer patent.
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