看水质
本帖最后由 gada888 于 2019-7-17 16:00 编辑有时候想检测一下水质,可是不想通过串口来看,想更加便携一点,于是通过一个Nokia5110显示屏来看。5100的特点是屏大。显示行数多。================================
项目使用模块如下:
TDS(Total Dissolved Solids),中文名总溶解固体,又称溶解性固体总量,表明1升水中溶有多少毫克溶解性固体。一般来说,TDS值越高,表示水中含有的
溶解物越多,水就越不洁净。因此,TDS值的大小,可作为反映水的洁净程度的依据之一。
常用的TDS检测设备为TDS笔,虽然价格低廉,简单易用,但不能把数据传给控制系统,做长时间的在线监测,并做水质状况分析。使用专门的仪器,虽然能
传数据,精度也高,但价格很贵。为此,我们专门推出了这款arduino兼容的TDS传感器,连接至arduino控制器后,就可用于测量水的TDS值。
该产品专为arduino设计,即插即用,使用简单方便。3.3~5.5V的宽电压供电,0~2.3V的模拟信号输出,使得这款产品兼容5V、3.3V控制系统,能非常方便
的接到现成的控制系统中使用。测量用的激励源采用交流信号,可有效防止探头极化,延长探头寿命的同时,也增加了输出信号的稳定性。TDS探头为防水探
头,可长期浸入水中测量。
该产品可应用于生活用水、水培等领域的水质检测。有了这个传感器,就可轻松DIY一套TDS检测仪了,轻松检测水的洁净程度,为你的水质把好关。
输入电压:3.3~5.5V
输出信号:0~2.3V
工作电流: 3~6mA
TDS测量范围:0~1000ppm
TDS测量精度:±10% F.S.(25℃)
写的测试代码
// made by gada888
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>
#define TdsSensorPin A0
#define VREF 5.0 // analog reference voltage(Volt) of the ADC
#define SCOUNT30 // sum of sample point
int analogBuffer; // store the analog value in the array, read from ADC
int analogBufferTemp;
int analogBufferIndex = 0,copyIndex = 0;
float averageVoltage = 0,tdsValue = 0,temperature = 25;
///////////////////////////////////////////////////////////
Adafruit_PCD8544 display = Adafruit_PCD8544(13, 11, 5, 4, 3);
void setup() {
Serial.begin(9600);
pinMode(TdsSensorPin,INPUT);
// Display initialisieren
display.begin();
display.setContrast(60);
display.clearDisplay(); // clears the screen and buffer
}
void loop()
{
display.setTextSize(1);
set_text(11,0,"gada888!",BLACK);
delay(500);
display.setTextSize(1);
set_text(1,20,"TDS:",BLACK);
delay(500);
display.setCursor(20,20);
display.print(""); //this will be written on the LCD
display.println(tdsValue);
display.display();
delay(1000);
// Ein kleines bisschen Scroll-Text-Magie
int x=0;
for(int i=0;i<(5.6*8);i++){
set_text(x,40,"gada888@msn.com",BLACK);
delay(i==0?1000:100);
if(i<(5.6*8)-1)set_text(x,40,"gada888@msn.com",WHITE);
if((i)<(2.74*8))x-=1;else x+=1;
}
delay(250);
display.clearDisplay(); // Display wieder löschen
static unsigned long analogSampleTimepoint = millis();
if(millis()-analogSampleTimepoint > 40U) //every 40 milliseconds,read the analog value from the ADC
{
analogSampleTimepoint = millis();
analogBuffer = analogRead(TdsSensorPin); //read the analog value and store into the buffer
analogBufferIndex++;
if(analogBufferIndex == SCOUNT)
analogBufferIndex = 0;
}
static unsigned long printTimepoint = millis();
if(millis()-printTimepoint > 800U)
{
printTimepoint = millis();
for(copyIndex=0;copyIndex<SCOUNT;copyIndex++)
analogBufferTemp= analogBuffer;
averageVoltage = getMedianNum(analogBufferTemp,SCOUNT) * (float)VREF / 1024.0; // read the analog value more stable by the median filtering algorithm, and convert to voltage value
float compensationCoefficient=1.0+0.02*(temperature-25.0); //temperature compensation formula: fFinalResult(25^C) = fFinalResult(current)/(1.0+0.02*(fTP-25.0));
float compensationVolatge=averageVoltage/compensationCoefficient;//temperature compensation
tdsValue=(133.42*compensationVolatge*compensationVolatge*compensationVolatge - 255.86*compensationVolatge*compensationVolatge + 857.39*compensationVolatge)*0.5; //convert voltage value to tds value
//Serial.print("voltage:");
//Serial.print(averageVoltage,2);
//Serial.print("V ");
Serial.print("TDS Value:");
Serial.print(tdsValue,0);
Serial.println("ppm");
}
}
int getMedianNum(int bArray[], int iFilterLen)
{
int bTab;
for (byte i = 0; i<iFilterLen; i++)
bTab = bArray;
int i, j, bTemp;
for (j = 0; j < iFilterLen - 1; j++)
{
for (i = 0; i < iFilterLen - j - 1; i++)
{
if (bTab > bTab)
{
bTemp = bTab;
bTab = bTab;
bTab = bTemp;
}
}
}
if ((iFilterLen & 1) > 0)
bTemp = bTab[(iFilterLen - 1) / 2];
else
bTemp = (bTab + bTab) / 2;
return bTemp;
}
void set_text(int x,int y,String text,int color){
display.setTextColor(color);
display.setCursor(x,y);
display.println(text);
display.display();
}
连线图
https://v.youku.com/v_show/id_XNDI3NjY2NTE1Ng==.html?spm=a2h3j.8428770.3416059.1
不错不错
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