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  環(huan)境(jing)溫(wen)(wen)度(du)(du)(du)(du)與我(wo)們生(sheng)活息(xi)(xi)息(xi)(xi)相關(guan)，溫(wen)(wen)度(du)(du)(du)(du)高了會感覺(jue)熱，溫(wen)(wen)度(du)(du)(du)(du)低了會感覺(jue)冷，那么(me)我(wo)們怎樣知道(dao)環(huan)境(jing)中的溫(wen)(wen)度(du)(du)(du)(du)究竟是(shi)多少攝氏(shi)度(du)(du)(du)(du)呢？這里給大家介紹一(yi)個數字(zi)測溫(wen)(wen)電路(lu)，電路(lu)通電后LED顯示實時溫(wen)度(du)測(ce)量值，溫(wen)度(du)計的溫(wen)度(du)測(ce)量范圍為(wei)0~99.9℃。該電路不僅可(ke)以(yi)顯(xian)示實時(shi)測量(liang)溫(wen)(wen)度(du)值(zhi)，還(huan)可(ke)以(yi)通(tong)過按鍵選(xuan)擇溫(wen)(wen)度(du)計的(de)報(bao)警值(zhi)，當(dang)溫(wen)(wen)度(du)高于(yu)某個設定溫(wen)(wen)度(du)時(shi)，溫(wen)(wen)度(du)計報(bao)警指示燈點亮。

溫度檢(jian)測電(dian)路：溫度檢(jian)測電(dian)路主要由并聯式穩(wen)壓器、電(dian)橋(qiao)和差(cha)分放大器組成(cheng)，由U5構成的并(bing)聯式穩壓(ya)電(dian)源，為電(dian)橋提(ti)供(gong)高精(jing)度4.096V的電壓(ya)，電橋(qiao)由R29、R30、R39、R40和PT100組成，RP4用于電路調試(shi)，在電路調試(shi)過程(cheng)中(zhong)通過調節RP4來模擬(ni)PT100的溫度(du)變化，方便(bian)電(dian)路調試，電(dian)橋輸出的差分電(dian)壓V=4.096*(RP1/(R29+ RP1)-(R39//R40)/(R30+ R39//R40))，該(gai)信號通過(guo)R31和R34送入由U7B組成的差分放大器(qi)進行(xing)前級放大。