本程序提供AVR单片机ATMEL8515的光控倒数计时后自动报警程序。属于AVR单片机的综合应用。程序简单易懂，注释可读性强。-This program provides the light control AVR microcontroller ATMEL8515 countdown to automatically alarm program. AVR microcontroller are integrated application. Procedures are simple and

px4flow光流传感器固件，可以直接利用pixhawk飞控实现室内自主飞行。-Px4flow optical flow sensor firmware, pixhawk can be directly used to achieve autonomous flight flight control room.