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You can use 8051 also in the place of TI controller. Check the specification of the TI controller pins and find out the equailent pins from 8051. If the specs are matching then u can just replace the controller. You may find an 8051 variant with inbuilt ADC. Actually the TI controller has very low power requirement. If you dont have any power constrains then there is no problem of using 8051. As I mentioned in the previous post design of the chamber is very important.