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t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻,天空是陰暗的,空氣里有著剛下過雨之后的清新因子。想要的,不想要的,界限明確,好像沒有什么可以撼動(dòng)自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。 } void delay5ms(void) //誤差 0us { unsigned char a,b。 LCD_WriteCom(0x38)。 LCD_RW=0。 _nop_()。aNum_Adat。 TH0=0xfc。 View_Change=1。 } else { Xintiao_Jishu=0。 View_Data[1]=(60000/Xintiao_Jishu)%100/10+0x30。 } break。 } case 2: { if((P3amp。0x07) { case 0x06:Key_Value=1。 TH1=0xd8。 View_H[1]=Xintiao_H%100/10+0x30。 if(View_L[0]==0x30) View_L[0]=39。 lcd_1602_word(0xc0,16, )。 39。 } case 2: { if(View_Con==2) { if(Xintiao_H150) Xintiao_H++。 lcd_1602_word(0x80,16,Heart Rate: )。 uchar Xintiao_H=100。 /*1602 字符顯示函數(shù),變 量依次為字符顯示首地址,顯示字符長度,所顯示的字符 */ void InitLcd()。 sbit LCD_RW =P2^6。祖先曾經(jīng)教導(dǎo)我們:一年之計(jì)在于春,一日之計(jì)在于晨。這次的設(shè)計(jì)為讓我的學(xué)到的東西定會(huì)在我以后的人生中起到非凡的作用。 延安大學(xué)西安創(chuàng)新學(xué)院本科畢業(yè)論文(設(shè)計(jì)) 15 7 結(jié)束語 脈搏檢測中關(guān)鍵技術(shù)是單片機(jī)設(shè)置與傳感器輸出的信號(hào)提取問題 , 本文設(shè)計(jì)系統(tǒng)模擬電路簡單,由 AT89S51 芯片實(shí)現(xiàn)脈搏信號(hào)采集,信號(hào)處理,脈搏計(jì)數(shù)等功能,因此體積小,功耗低,系統(tǒng)穩(wěn)定性高。 Keil C51軟件提供豐富的庫函數(shù)和功能強(qiáng)大的集成開發(fā)調(diào)試工具,全 Windows界面。雙電源 (177。 12M) =1us。 只讀取外部的程序存儲(chǔ)器中的內(nèi)容,讀取的地址范圍為 0000H~ FFFFH( 64KB),片內(nèi)的 4KB Flash 程序存儲(chǔ)器不起作用。 ),由 VPD 向內(nèi)部 RAM供電,以保持內(nèi)部 RAM中的數(shù)據(jù)。電容的值沒有嚴(yán)格要求,但其取值對(duì)振蕩器的頻率輸出的穩(wěn)定性、大小、振蕩電路起振速度稍有影響, C C2 可在 20pF~100pF 之間選擇。 MCS- 51的主要特點(diǎn)為: 8位; ,頻率范圍為 ~12MHz; 128字節(jié)的數(shù)據(jù)存儲(chǔ)器;( RAM) 4KB的 Flash 程序存儲(chǔ)器;( ROM) 64KB;(需要擴(kuò)展 ROM) 64KB;(需要擴(kuò)展 RAM) ( 16字節(jié))用戶位尋址空間;(在 128個(gè)字節(jié)中) SFR( MCS— 52 子系列為 21個(gè)); 8位的并行 I/O接口: P0、 P P P3; 16位定時(shí)器 /計(jì)數(shù)器 T0、 T1;( MCS52子系列為 3個(gè), T2) 5個(gè)中斷源;(高、低 2 個(gè)) I/O接口,可多機(jī)通信; ; ; 延安大學(xué)西安創(chuàng)新學(xué)院本科畢業(yè)論文(設(shè)計(jì)) 5 A T8 9 S5 1 圖 41 DIP 引腳圖 89S51有 40個(gè)引腳 引腳按其功能可分為如下 3類: — - VCC、 VSS; XTAL XTAL2; — RST/VPD、 ALE/PROG、 PSEN、和 EA/VPP; —— P0、 P P P3,為 4 個(gè) 8位 I/O口。 顯示部分 通過對(duì)顯示器的 觀察和了解, 最終采用 LCD1602 液晶顯示器, LCD1602 在顯示數(shù)字和字母上比較方便;在控制上比較簡單;而且成本相對(duì)較低。脈搏傳感器的精度、靈敏度、抗干擾能力及安裝方式?jīng)Q定了 脈搏測量精度,因此其選型對(duì)整個(gè)設(shè)計(jì)具有決定性的作用。當(dāng)血液回流到心臟時(shí),人體組織內(nèi)的半透明度會(huì)增大。采用紅外對(duì)管脈心率感器作為傳感器對(duì)人體的脈搏心率警醒數(shù)據(jù)采集。一個(gè)人的心率值基本能反映出他心臟的健康狀況,心臟是我們身體中最重要的器官之一,它為我們提供源動(dòng)力。 心率計(jì)通過感知手指內(nèi)的微弱波動(dòng)來接收信號(hào),可以避免 人工聽診器所帶來不必要的麻煩。 關(guān)鍵詞: AT89S51單片機(jī)、心率計(jì)數(shù)器、 LM358P Ⅱ DESING OF DIGITAL HEARAT RATE METER Abstract: This paper is the design of 51 singlechip digital rate meter based on the infrared tube, sensor and photoelectric conversion principle to detect heart rate. Heart rate meter to receive signals through the weak fluctuation in the finger of perception, so as to avoid unnecessary trouble caused by the artificial stethoscope. A heart rate sensor sampling pulse signal, uses AT89S51 as the MCU, a heart rate sensor output Fang Bo ining MCU, MCU each receives a pulse waveform, digital tube counting time. The number of beats overrun with buzzer alarm. Increase power triode, drive to work. So as to realize the heart rate counting functions, further can detect diseases purpose. Key words: Heart counter、 AT89S5 LM358P Ⅲ 目 錄 引言 ..................................................................................................................................................... 1 系統(tǒng)方案選擇與論證 ..................................................................................................................... 1 、 任務(wù) .............................................................................................................................................. 1 、 心率計(jì)的選用 .............................................................................................................................. 1 、 各個(gè)電路的選擇 .......................................................................................................................... 2 、 脈搏傳感器部分 .................................................................................................................. 2 、 單片機(jī)選擇 .......................................................................................................................... 2 、 顯示部分 .............................................................................................................................. 3 、 系統(tǒng)各模塊的最終方案 ...................................................................................................... 3 系統(tǒng)簡述 ............................................................................................................................................ 3 本系統(tǒng)核心器件簡介 ..................................................................................................................... 4 、 AT89S51單片機(jī) ........................................................................................................................... 4 、 電源引腳 .....................................................................................................