publications
publications in reversed chronological order
2019
- Low-cost 3D-Printed Prosthetic HandKe Wei Zhang, Li Ren Liu, and Minyue JinSingapore Science and Engineering Fair 2019
Current prosthetic hands are extremely expensive and thus inaccessible to patients with upper limb deficiency in impoverished countries. Hence, we wish to 3D-print a low-cost prosthetic hand. Analysis of electromyography (EMG) signals with the bandpass filter and fast fourier transform (FFT) yielded characteristic frequencies and amplitudes unique to certain motions, identifying motions with a 10% total error rate, thus this method is suitable for identification of patients’ desired motions and control of the hand. Furthermore, the system allows for quick patient training and adaptation for a fairly accurate identification of motion. A novel electrically conductive acrylonitrile butadiene styrene/carbon nanotube (ABS/CNT) composite can be 3D-printed with the hand, allowing it to interface with touchscreens. Testing of ABS/CNT strips with different surface areas on an capacitive touchscreen revealed a direct linear correlation between the effectiveness of the finger-touchscreen interface and the surface area of ABS/CNT used. Experiments with the finger on a capacitive touchscreen at different velocities revealed a inverse linear relationship between the velocity of the finger and the effectiveness of the finger-touchscreen interface. Overall, a proof of concept of a digit capable of interacting with a touchscreen has been demonstrated and shows the feasibility of such an endeavour.