ARM9315开源电路板，可供学习和借鉴，包含原理图和PCBLayout，实测可用。(ARM9315 open source circuit board for learning and reference, including schematics and PCBLayout, measured available.)

恒拓科技源码分享，开发飞控的同学的，可以下载来看看学习(Heng billiton technology source sharing, the development of the flight control of students, you can download to look at the learning)

51单片机，普中科技学习班v3.0 HC6800-EM3 原理图(51 MCU, general science and technology learning class v3.0 HC6800-EM3 schematic)