用AVR的模拟SPI总线读取，K型热电偶转换芯片的数据，可用，不过跳动挺大，可能硬件干扰，芯片的转换-with AVR simulation SPI bus read, K-type thermocouple conversion chip data available, but beating Tingda. may interfere with the hardware, chips conversion

研华8路热电偶输入USB模块USB-4718使用手册-Advantech 8 Thermocouple Input USB Module USB-4718 User