NFC Attendance System Main Features NFC token exchange WeChat Mini-Program WiFi SmartConfig support Audio prompt (I2S output) GUI output (GIF animations) OTA firmware update (HTTP / HTTPS) Repositories ESP32 Core Controller WeChat Mini-Program PHP Backend Server EAGLE Schematic Board Mini-Program Code Videos Links 智慧校园NFC考勤系统简介 (YouTube) 智慧校园NFC考勤系统配套微信小程序 (YouTube)