單片機畢業(yè)設(shè)計外文翻譯---基于at89s51單片機的微型土壤濕度檢測儀設(shè)計-單片機(存儲版)
【正文】 則放大后的輸 出模擬信號電壓 V0=48?Vi，故輸出模擬信號電壓范圍為 0~。通道受控情況如下： ①當(dāng) DI 依次輸入 0 時，只對 CH0 通道進行單通道轉(zhuǎn)換； ②當(dāng) DI 依次輸入 1 時，只對 CH1 通道進行單通道轉(zhuǎn)換； ③當(dāng) DI 依次輸入 0、 0 時，將 CH0 作為正輸入端 “ IN+”， CH1 作為負輸入端“ IN”； ④當(dāng) DI 依次輸入 0、 1 時，將 CH0 作為負輸入端“ IN”， CH1 作為正輸入端“ IN+”。 液晶顯示器的使用 顯示器件采用微型液晶顯示器 1602LCD，其性能特點是：工作電壓僅需 ～；功耗非常低（工作電流只有 ）；且工作可靠；體積?。娠@示 16 2 個字符）。時鐘分頻器（ 通過它可以得到 的轉(zhuǎn)換時鐘 ）在A/D 轉(zhuǎn)換器空閑時保持復(fù)位狀態(tài)，在 ADCR 的 START 字段被寫入 01（立即啟動轉(zhuǎn)換）或所選邊沿出現(xiàn)在選擇的信號上時可立刻啟動采樣時鐘。 //讀 取 ADC 結(jié) 果 ， 并 清 除 DONE 標志位 第五章 測溫系統(tǒng)的 Proteus 軟件仿真 為確保系統(tǒng)的可靠工作， 對軟硬件系統(tǒng)進行了 Proteus 軟件仿真。系統(tǒng)整體設(shè)計結(jié)構(gòu)簡單，運行可靠，在試用中取得了良好效果。 則其放大后的模擬電壓： V0=48 =， 土壤的相對濕度應(yīng)為： RH= 100=45%RH。當(dāng) DONE 位為 1 時， A/D 轉(zhuǎn)換模塊向向量中斷控制器（ VIC）發(fā)出中斷請求，如果 VIC 中 VICIntEnable 的 Bit8（ A/D 轉(zhuǎn)換中斷使能位）使能， 則會產(chǎn)生中斷。本系統(tǒng)的驅(qū)動程序采用 C 語言設(shè)計，其主程序如： main (void) { unsigned int AD_val。但由于 DO 和 DI 兩個端口 在通信時并未同時使用，而是先由 DI 端口輸入兩位數(shù)據(jù)（ 0 或 1）來選擇通道控制，再由 DO端輸出數(shù)據(jù) 。根據(jù)協(xié)議，當(dāng) ADC0832 未工作時，必須將片選端 CS 置于高電平，此時芯片禁用。 第二章 系統(tǒng)的組成 微型土壤檢測儀的信號處理系統(tǒng)包括土壤濕度傳感器、 A/D 采集電路、單片機和微型液晶顯示器。 DO = / / read take ADC and fruit, and clear except DONE mark bits while (1) . . } Section5 temperature measuring system of Proteus software simulation To ensure system on the hardware and software system, reliable work the Proteus software simulation. The basic process is first draw HaoTu 3 illustrates the simulation Electricity by road after Keil soft thing, Ed into the translation and born of dynamic soft thing ec flooding (files) : LPC2131 loaded. And Proteus software environment The simulation results ( + 3V corresponding full amount 30Kpa) the process design of the software and hardware the results show that the system is correct To ensure that the design of the software and hardware of soil detector is correct this paper designs proteus soft thing into line imitation true. The base this process is first draw had made good figure 2 shows simulation circuit, Keil software piled by again and to create system driver ( *. Wen pieces ) load: the monolithic machine, and will figure 2 virtual dc voltage signal generator set to 45mV. Then the simulation of voltage: enlarge V0 = 48 x = V, soil relative humidity should be: RH = by 100 = 45% RH. Start the simulation can see 1602LCD in figure 2 The simulation results show that the % RH (for the calculation and existing tiny According to convert error). The results show that the system software and hardware design are right. Section6 conclusion This paper introduces some machine oxygen pressure detection adjustment system design of the software and hardware square method. This set with set in A project into A/D turn changing mould pieces of high sexual can LPC2131 chip, tell the plus special A/D acquisition chip, simplified the peripheral circuit design. The system design is simple in structure, reliable in trial has obtained good effect. (1) this design using highly integrated humidity detector A/D conversion chip, SCM and LCD module, greatly simplifying the hardware circuit and significantly reduce the size and cost of A circuit board. (2) electric pressure letter in ADC0832, integrating core piece of work is really is. Ec The most important premise, to ensure reliable of the analog signal collection, collection need before use integrated amp sensor signal amplifier. (3) the loam soil by small, measuring devices body product by pure degree is high and measured this very low, suitable to use of agricultural first production line. (4) the system can shorten Proteus simulation designing cycle, managing hardware
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