增强型单总线数字温度传感器DS1820的说明书，pdf格式的，-Enhanced single bus DS1820 digital temperature sensor, the PDF.

51单片机学习板，可以通过PDF来学习，有DS1302,18B20,有4x4键盘，可以通过电脑的键盘来控制学习板，有红外接收功能-51 MCU learning board, you can PDF to learn, there DS1302, 18B20, a 4x4 keypad, you can learn the computer keyboard to control the boards, with infrared reception