Temperature measuring system circuit box circuit with thermocouple cold end temperature compensation and converter MAX6675

Published:2011/8/30 22:12:00 Author:Jessie | Keyword: Temperature measuring system, circuit box, thermocouple cold end temperature compensation, converter | From:SeekIC

The temperature measuring system composedof MAX6675 is shown in the diagram. K thermocouple is connected to the T+ and T- of MAX6675, and the cold endof thermocouple is in the ground. Host chooses the 8051 microcontroller, and MAX6675 is the slave. From the P1.1 port of 8051, it sends serial clock to MAX6675,and P1.0 portis used to receive MAX6675 output temperature data. P1.2 port outputs low level to set CS 0. System is equipped withfive-position common cathode LED digital tube. Set decimal pointat ten behind, then wecan measure the temperature of 0~ +1024 ℃, and resolution is 0.1 ℃. P0 port is used to respectively connect decoding drive CD4511 and driver 74LS154.



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