【導(dǎo)讀】水質(zhì)檢測儀對(duì)幫助人們了解水。質(zhì)情況起到了重要的作用。TDS水質(zhì)檢測儀以其結(jié)構(gòu)簡單，精巧實(shí)用，精度高，成本低，反應(yīng)快。等優(yōu)點(diǎn)備受關(guān)注。TDS水質(zhì)測試儀由于探頭極化現(xiàn)象，寄生電容，溫度對(duì)測量精度的影響,使其。針對(duì)這些現(xiàn)象，為了能夠更精確測量水質(zhì)，本研究分析。該電路設(shè)計(jì)以AT89C2051單片機(jī)為核心，由傳感器探頭、電導(dǎo)率信號(hào)采。集電路、溫度補(bǔ)償電路、控制電路、數(shù)碼管顯示電路和報(bào)警電路組成。系統(tǒng)引入了溫度測量環(huán)節(jié)，通過軟件算法補(bǔ)償因溫度變化引起的測量誤差。

　　

【正文】 a1=(uchar)(count_buff/100)。 a2=(uchar)(count_buff%100/10)。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 23 a3=(uchar)(count_buff%10)。 led1=0。 P1=num[a1]。 delay(5)。 led1=1。 led2=0。 P1=num[a2]。 delay(5)。 led2=1。 led3=0。 P1=num[a3]。 delay(5)。 led3=1。 } /*********************************************/ void t0(void) interrupt 1 { TR1=1。 i++。 if(i==21) { TR1=0。 i=0。 count=TH1*256+TL1。 flag=1。 TH1=0x00。 TL1=0x00。 } TH0=(6553650000)/ 256。 TL0=(6553650000)% 256。 } bit Init_DS18B20(void) {uchar m。 bit flag。 DQ = 1。 for(time=0。time10。time++) 。 DQ = 0。 for(m=0。m15。m++) for(time=0。time50。time++ 。) DQ = 1。 for(time=0。time50。time++) 。 flag=DQ。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 24 for(m=0。m3。m++) for(time=0。time50。time++)。 return (flag)。 } /***************************************************** 函數(shù)功能：從 DS18B20讀取一個(gè)字節(jié)數(shù)據(jù) 出口參數(shù)： dat ***************************************************/ unsigned char ReadOneChar(void) { unsigned char i=0,m。 unsigned char dat。 for (i=0。i8。i++) { DQ =1。 for(m=0。m4。m++) _nop_()。 DQ = 0。 for(m=0。m4。m++)。 dat=1。 for(m=0。m4。m++)。 DQ = 1。 if(DQ) dat|=0x80。 else dat|=0x00。 for(time=0。time25。time++) 。 } return(dat)。 } /***************************************************** 函數(shù)功能：向 DS18B20寫入一個(gè)字節(jié)數(shù)據(jù) 入口參數(shù)： dat ***************************************************/ WriteOneChar(uchar val) {unsigned char i,m,b。 for(i=8。i0。i) { DQ=1。 for(m=0。m2。m++)。 DQ=0。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 25 for(m=0。m4。m++) _nop_()。 DQ=valamp。0x01。 for(b=0。b2。b++) for(m=0。m40。m++) _nop_()。 val=val/2。 } DQ=1。 for(m=0。m7。m++) _nop_()。 } void caculate_TDS(void) { unit TDS。 if(temp10amp。amp。temp=1) {Ks=Kt/(+)。 } if(temp20amp。amp。temp=10) {Ks=Kt/(+)。 } if(temp30amp。amp。temp=20) {Ks=Kt/(+)。 } else { Ks=Kt/(+)。 } TDS=*Ks。 } /*********************************************/ void main(void) { TMOD=0x51。 while(1) { if(key==0) { while(!key)。 if(flag==0) { TH0=(6553650000)/ 256。 TL0=(6553650000)% 256。 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 26 TH1=0x00。 TL1=0x00。 EA=1。 ET0=1。 count=0。 TR0=1。 flag=1。 } else { TR0=0。 flag=0。 } show_num()。 } show_num()。 } } 湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 27 總體電路圖： TRIG2Q3R4CVolt5THR6DIS7VCC8GND1U25551 2J1 CON2VCCB1C2E3Q1 8050Y1 12MHZe1d246c4a11b73829f10112h3g5ABCU4 LED3DE2C3B1Q2 PNPE2C3B1Q3 8550E2C3B18550PNPR1 470R2 470R3 470R4 470R5 470R6 470R7 470R8 R9 C122pfC2 22pfC3 103C4 104VCCVCCVCCC5 22ufS1 SWPB12J2 CON2VCCR1010kR1110k1122S2 SWSPSTP1.0/AIN012P1.1/AIN113P1.214P1.315P1.416P1.517P1.618P1.719RST/Vpp1P3.0/RXD2P3.1/TXD3P3.2/^INT06P3.3/^INT17P3.4/T08P3.5/T19P3.711XTAL24XTAL15GND10VCC20U? at89c2051VCCR13470Q5PNPD1 LEDR12470LS1SPEAKERVCC123DS2DS18b20R14VCCVCCDA GND湖州師范學(xué)院求真學(xué)院本科畢業(yè)論文 28 g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。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 it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. 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。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。re clear about the terms of the agreement. It might be