Nangona uxhulumaniso phakathi kwe-tn901 kunye nezikhonkwane ze-MCU zilula, indlela i-in9 ehambisa ngayo idatha kwi-MCU kunye nendlela i-MCU efumana ngayo idatha kwaye ibala kugxininiso kunye nobunzima bolu yilo. Ngokubonisana nenani elikhulu leencwadi, ukuhlalutya indlela yokuhanjiswa kwe-SPI interface, kunye nokuqhuba iimvavanyo ezininzi kunye nezishwankathelo, kugqitywa ukuba isitshixo soyilo lwenkqubo silele ekubhaqweni komgca wokuwa kwesignali yewotshi, kunye ne-single-chip microcomputer ifunda amasuntswana edatha yesakhelo ngasinye esithunyelwe sisiva i-tn9. I-MCU ifunda iibyte ezi-5 ngexesha. <br>Kuphela xa i-byte yokuqala kunye ne-byte yokugqibela i-4CH (okanye i-66h) kunye ne-ODH ngokulandelanayo, inokuthathwa njengedatha esebenzayo, ngaphandle koko i-microcontroller iyaqhubeka nokufunda. I-MCU sele isenza loop okwethutyana. Xa isitshixo se-K1 okanye i-K2 sibangelwa, i-microcontroller inika umgangatho ophantsi kwi-P1 2 pin ukuqala i-infrared sensor tn901. Logama nje i-infrared sensor tn901 ivuliwe, iya kulinganisa ubushushu be-ambient kunye neqondo lobushushu ekujoliswe kulo, kodwa eyona ityhubhu ye-nixie edibeneyo enamanani ama-4 esiyisebenzisayo ayinakukwazi ukubonisa amaxabiso omabini ngaxeshanye. Ngoko ke, sahlula i-K1 kunye ne-K2 ukwahlula ukuba iqondo lobushushu le-ambient okanye iqondo lobushushu ekujoliswe kulo linokulinganiswa.
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