LiPo 배터리(18650) 3.7V 2.9mAh: https://www.amazon.de/gp/product/B013GFRNOQ/ref=oh\_aui\_detailpage\_o02\_s00?ie=UTF8&psc=1
테스터: https://www.conrad.de/de/drucktaster-24-v-dcac-01-a-1-x-aus-ein-rafi-1101070110104-tastend-1-st-705110.html
프로세서: Microchip PIC 16F628A