avr单片机开发板原理图。具有232，485等通信接口，isp，jtag，i2c等总线，热敏电阻，8位LED显示等常用功能。-avr microcontroller development board schematics. With 232,485 other communication interface, isp, jtag, i2c, etc. bus, thermal resistance, 8-bit LED display common features.