外文翻譯---自動洗碗機(jī)的控制系統(tǒng)設(shè)計(jì)-其他專業(yè)(編輯修改稿)
2025-02-24 09:43 本頁面
【文章內(nèi)容簡介】 針對上述功能及可靠性、成本和方便使用維護(hù)等因素，筆者設(shè)計(jì)了圖２所示的洗碗機(jī)控制系統(tǒng)。 單片機(jī)最小系統(tǒng)采用與ＭＣＳ－５１兼容的ＡＴ ＭＥＬ公司低功耗高性能ＣＭＯＳ芯片ＡＴ８９ＬＳ８２５２設(shè)計(jì)，其中片內(nèi)８ｋ 字節(jié)在線可編程閃存用以存放系統(tǒng)程序，可通過ＳＰＩ接口來下載程序；而２ｋ字節(jié)的ＥＥＰＲＯＭ則用以存放關(guān)鍵參數(shù)，如開機(jī)維護(hù)密碼、產(chǎn)品的序列號、開機(jī)次數(shù)、洗滌設(shè)置參數(shù)等；２５６字節(jié)的ＲＡＭ用來存放臨時(shí)變量。 外文翻譯 5 鑒于本洗碗機(jī)有較多的開關(guān)量信號，故此，設(shè)計(jì)中使用并行芯片８２５５來擴(kuò)展Ｉ／Ｏ接口，以配合Ｐ１和Ｐ３口部分管腳的使用，其輸出和輸入的比例為２１／１４，其中蜂鳴器由Ｐ１．３控制。從可靠性角度出發(fā)，輸入和輸出部分都采用光電隔離措施?？紤]到部分驅(qū)動信號所要求的驅(qū)動電流較大，因此，本設(shè)計(jì)選用功率驅(qū)動器件ＵＬＮ２８０３來 驅(qū)動。 溫度采集有兩種方案：一是使用熱敏電阻配合芯片ＭＡＸ１５０進(jìn)行ＡＤ轉(zhuǎn)換，然后通過存放在程序存儲器里的表格來求得當(dāng)前溫度；二是使用三端溫度傳感器ＤＳ１８Ｂ２０進(jìn)行采集，直接得到溫度數(shù)據(jù)。相比之下，后一種方案較為經(jīng)濟(jì)簡捷。 鍵盤和ＬＥＤ顯示選用ＨＤ７２７９Ａ ３ 來進(jìn)行控制，其電路圖如圖３所示。ＨＤ７２７９Ａ無需外圍元件即可直接驅(qū)動８位共陰式ＬＥＤ數(shù)碼管；引腳ＤＩＧ０～３對應(yīng)０～３位數(shù)字輸出驅(qū)動；引腳ＳＡ～ＳＧ和ＤＰ則對應(yīng)于段ａ～ｇ及小數(shù)點(diǎn)的驅(qū)動輸出；各位可獨(dú)立控制譯碼／不譯碼及消隱和閃爍等屬性。 PO Bus Driver74LS245 DB 8255 Switch output CB Buzzer Address buffer74LS573 AB Switch Input CPU AT89LS8252 Y8255 DB P2 Address decoding74LS138 YMAX150 AD samplingMAX150 CB Minimum System CB Read / write control Keyboard and Four 8segment LED circuit continuity display management 4*4 keyboard P1 Figure 2 controller hardware structure 外文翻譯 6 The chip there are three types of instruction: The first one is without six of the eight dataorders, such as reduction, testing, left / right (cycle) and transposition。 second is the 7 with 16 orders data , including downloading data by means 0 / 1 decoder, download not decoding, scintillation, blanking, paragraph lit, closed。 third keyboard data is read instructions. Serial way they are used to municate with AT89LS8252, DATApin serial data from the chip into by the CLKsynchronization. When the chipselect signal CS into low, the data on DATApin will be in the CLK pin at the rising edge of the buffer HD7279A was written into the register. In addition, the chip contains HD7279A to jitter circuitry, which can be controlled 64 key keyboard matrix. Figure 2, ponents for the 4 4 JKEY keyboard interface, when a key is pressed, the output pin LOW KEY, LED1 bright lightemitting diodes, the state has been key to the release. If at this time to receive the Reading keyboard mands 15 H, in the first half of the directive, DATA pin will be in a highimpedance state to receive instructions from the microprocessor. In the latter half of the directive, the DATA input pins from state to state output for the output value ofthe code by pressing the button. 該芯片共有三種類型的指令：第一種是６條不帶數(shù)據(jù)的８位純指令，如復(fù)位、測試、左／右（循環(huán)）移位等；第二種是７條１６位帶數(shù)據(jù)指令，包括下載數(shù)據(jù)按方式０／１譯碼、下載不譯碼、閃爍、消隱、段點(diǎn)亮、關(guān)閉等；第三種是讀取鍵盤數(shù)據(jù)指令。它們均采用串行方式與ＡＴ８９ＬＳ８２５２進(jìn)行通訊，串行數(shù)外文翻譯 7 據(jù)從ＤＡＴＡ引腳送入芯片并由ＣＬＫ端同步。當(dāng)片選信號ＣＳ變?yōu)榈碗娖胶?，ＤＡＴＡ引腳上的數(shù)據(jù)將在ＣＬＫ引腳的上升沿時(shí)被寫入ＨＤ７２７９Ａ的緩沖寄存器。 此外，ＨＤ７２７９Ａ片內(nèi)含有去抖動電路，可控制６４鍵鍵盤矩陣。圖３中，元件ＪＫＥＹ 為４ ４鍵盤接口，當(dāng)有鍵按下時(shí)，ＫＥＹ引腳
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