描述
當(dāng)用TCS230識(shí)別顏色時(shí),就用這3個(gè)參數(shù)對(duì)所測(cè)顏色的R、G和B進(jìn)行調(diào)整。這里有兩種方法來(lái)計(jì)算調(diào)整參數(shù):①依次選通三種顏色的濾波器,然后對(duì)TCS230的輸出脈沖依次進(jìn)行計(jì)數(shù)。當(dāng)計(jì)數(shù)到255時(shí)停止計(jì)數(shù),分別計(jì)算每個(gè)通道所用的時(shí)間。這些時(shí)間對(duì)應(yīng)于實(shí)際測(cè)試時(shí)TCS230每種濾波器所采用的時(shí)間基準(zhǔn),在這段時(shí)間內(nèi)所測(cè)得的脈沖數(shù)就是所對(duì)應(yīng)的R、G和B的值。②設(shè)置定時(shí)器為一固定時(shí)間(例如10ms),然后選通三種顏色的濾波器,計(jì)算這段時(shí)間內(nèi)TCS230的輸出脈沖數(shù),計(jì)算出一個(gè)比例因子,通過這個(gè)比例因子可以把這些脈沖數(shù)變?yōu)?55。在實(shí)際測(cè)試時(shí),使用同樣的時(shí)間進(jìn)行計(jì)數(shù),把測(cè)得的脈沖數(shù)再乘以求得的比例因子,然后就可以得到所對(duì)應(yīng)的R、G和B的值。
3TCS230的應(yīng)用——顏色識(shí)別電路
基于上述分析,采用89C51和TCS230設(shè)計(jì)一個(gè)醫(yī)用液體顏色識(shí)別裝置。該裝置具有結(jié)構(gòu)簡(jiǎn)單、識(shí)別精度和效率高的特點(diǎn),并且能夠和上位機(jī)通信,以將識(shí)別的結(jié)果實(shí)時(shí)傳送給上位機(jī)。由于是說(shuō)明TCS230的使用情況,下面僅給出其中的TCS230識(shí)別電路,如圖2所示。圖2中用89C51的P1口的幾圖3軟件流程個(gè)引腳來(lái)控制TCS230的各個(gè)控制引腳,而TCS230的輸出引腳連接到89C51的定時(shí)器/計(jì)數(shù)器1的輸入端(P35)。設(shè)置89C51定時(shí)器/計(jì)數(shù)器為相應(yīng)的工作方式,初始化89C51定時(shí)器為一個(gè)定值,再選擇TCS230的輸出比例因子,并使能輸出引腳。實(shí)際使用中,通過讀取89C51計(jì)數(shù)器的值,就可以分別計(jì)算出TCS230的3種輸出頻率,進(jìn)而確定R、G、B值及顏色。
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