1、arduino代码如下：

可直接进行串口打印或者oled显示（spi）

#include <SPI.h>
#include <Wire.h>
#include <math.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSerif9pt7b.h>
#include <MsTimer2.h> 
#include "TSL2581.h"
//---------------------------TDS-----------------------------------
#include <OneWire.h>
#include <DallasTemperature.h>
//-----------------------------------------------------------------
#include <SoftwareSerial.h>      //开启软串口SoftwareSerial mySerial(2 , 3); //第2= RX,第3= TX   //开启软串口
WaveShare_TSL2581 tsl = WaveShare_TSL2581();#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels// Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_MOSI   9
#define OLED_CLK   10
#define OLED_DC    11
#define OLED_CS    12
#define OLED_RESET 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);#define NUMFLAKES     10 // Number of snowflakes in the animation example#define Blank_KEY      7
#define Dark_KEY_INT   1
#define LED_Control    8//************************* User Defined Variables for TDS********************************************************////##################################################################################
//-----------  Do not Replace R1 with a resistor lower than 300 ohms    ------------
//##################################################################################int R1= 1000;
int Ra=25; //Resistance of powering Pins
int ECPin= A0;
int ECGround=A1;
int ECPower =A3;//*********** Converting to ppm [Learn to use EC it is much better**************//
// Hana      [USA]        PPMconverion:  0.5
// Eutech    [EU]          PPMconversion:  0.64
//Tranchen  [Australia]  PPMconversion:  0.7
// Why didnt anyone standardise this?float PPMconversion=0.7;//*************Compensating for temperature ************************************//
//The value below will change depending on what chemical solution we are measuring
//0.019 is generaly considered the standard for plant nutrients [google "Temperature compensation EC" for more info
float TemperatureCoef = 0.019; //this changes depending on what chemical we are measuring//********************** Cell Constant For Ec Measurements *********************//
//Mine was around 2.9 with plugs being a standard size they should all be around the same
//But If you get bad readings you can use the calibration script and fluid to get a better estimate for K
float K=2.88;//************ Temp Probe Related *********************************************//
#define ONE_WIRE_BUS 6          // Data wire For Temp Probe is plugged into pin 6 on the Arduino
const int TempProbePossitive =5;  //Temp Probe power connected to pin 5
const int TempProbeNegative=4;    //Temp Probe Negative connected to pin 4//***************************** END Of Recomended User Inputs *****************************************************************//void read2581_id(void);
void displayValue(void);unsigned long TSL2581_CH0=0,TSL2581_CH1=0;
float Absorbance=0.0;
float Turbidity=0.0;
unsigned int dark=0;
unsigned int blank=0;
int inCOMdate=0;
volatile int darkState = LOW;
volatile int timerState = LOW;
//----------------------------------------------TDS-------------------------------------------------------------
OneWire oneWire(ONE_WIRE_BUS);// Setup a oneWire instance to communicate with any OneWire devices
DallasTemperature sensors(&oneWire);// Pass our oneWire reference to Dallas Temperature.float Temperature=10;
float EC=0;// EC
float EC25 =0;// EC for 25oC
int ppm =0;//  TDS
float GH=0;// hardness of waterfloat raw= 0;
float Vin= 5;
float Vdrop= 0;
float Rc= 0;
float buffer=0;
int timeCount=0;
//-------------------------------------------------------------------------------------------------------------void setup() {//------------------------------------Serial----------------------Serial.begin(115200);mySerial.begin(115200);   //  设置虚拟串口波特率//---------------------------------LED and KEY---------------------pinMode(Blank_KEY, INPUT_PULLUP);pinMode(LED_Control,OUTPUT);digitalWrite(LED_Control, LOW);//led ONattachInterrupt(Dark_KEY_INT, dark_KEY, LOW);//-------------------------------18B20 and EC------------------------pinMode(TempProbeNegative , OUTPUT ); //seting ground pin as output for tmp probedigitalWrite(TempProbeNegative , LOW );//Seting it to ground so it can sink currentpinMode(TempProbePossitive , OUTPUT );//ditto but for positivedigitalWrite(TempProbePossitive , HIGH );pinMode(ECPin,INPUT);pinMode(ECPower,OUTPUT);//Setting pin for sourcing currentpinMode(ECGround,OUTPUT);//setting pin for sinking currentdigitalWrite(ECGround,LOW);//We can leave the ground connected permanantly//-----------------------------18B20 one wire-----------------------------------delay(100);// gives sensor time to settlesensors.begin();delay(100);//** Adding Digital Pin Resistance to [25 ohm] to the static Resistor *********//// Consule Read-Me for Why, or just accept it as trueR1=(R1+Ra);// Taking into acount Powering Pin Resitance//---------------------------------SSD1306 OLED-------------------// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internallyif(!display.begin(SSD1306_SWITCHCAPVCC)) {//Serial.println(F("SSD1306 allocation failed"));for(;;); // Don't proceed, loop forever}display.display();display.clearDisplay();displayValue();//------------------------------------TSL2581---------------------Wire.begin(); //i2c configread2581_id();/* Setup the sensor power on */tsl.TSL2581_power_on();delay(2000);//  /* Setup the sensor gain and integration time */tsl.TSL2581_config();//----------------------------------------------------------------MsTimer2::set(250, acquireData);        // 中断设置函数，每 500ms 进入一次中断MsTimer2::start();
}void loop() {if(timerState)//采集数据{timeCount++;// add 1 of 500mstsl.TSL2581_Read_Channel();TSL2581_CH0 = tsl.calculateLux(1, NOM_INTEG_CYCLE);TSL2581_CH1 = tsl.calculateLux(2, NOM_INTEG_CYCLE);}if(timeCount >= 10)//每5秒执行一次电导率采集,不能小于5秒{timeCount =0;GetEC(); PrintReadings();mySerial.write(ppm);mySerial.write(ppm);mySerial.write(Temperature); mySerial.write(Temperature);}if (Serial.available() > 0)//串口接收到数据{inCOMdate = Serial.read();//获取串口接收到的数据}switch(inCOMdate){case 'T':{inCOMdate =0;Serial.println(Turbidity,1);};break;// output the Turbiditycase 'E':{inCOMdate =0;Serial.println(EC25,2);};break;// output the ECcase 'S':{inCOMdate =0;Serial.println(ppm);};break;// output the TDScase 'G':{inCOMdate =0;Serial.println(GH,1);};break;// output the Hardnesscase 'W':{inCOMdate =0;Serial.println(Temperature,1);};break;// output the Temperaturedefault:break;}if((!digitalRead(Blank_KEY)) || (inCOMdate == 'B'))//KEY1 or COM=D{inCOMdate =0;blank = TSL2581_CH0;}if(darkState || (inCOMdate == 'D'))//采集暗电流{inCOMdate =0;digitalWrite(LED_Control, HIGH);//led OFFdelay(500);tsl.TSL2581_Read_Channel();TSL2581_CH0 = tsl.calculateLux(1, NOM_INTEG_CYCLE);TSL2581_CH1 = tsl.calculateLux(2, NOM_INTEG_CYCLE);dark = TSL2581_CH0;darkState = LOW;digitalWrite(LED_Control, LOW);//led ON}calculate();//计算吸光度和浊度displayValue();//display data}void dark_KEY(){darkState = HIGH;
}
void acquireData(){timerState = !timerState;
}void read2581_id(void)
{int   id;int a;id = tsl.TSL2581_Read_ID();a = id & 0xf0;      //The lower four bits are the silicon version numberif (!(a == 144))    //ID = 90H = 144D{//Serial.println("false....... ");display.clearDisplay();display.setCursor(0,10);display.print(F("false....... "));display.display();delay(500);} else {//Serial.print("I2C DEV is working ,id = ");//Serial.println(id);display.clearDisplay();display.setCursor(0,0);display.println(F("I2C DEV is working "));display.print(F("id = "));display.println(id);display.display();delay(500);}
}
void calculate(void){float temp1 = blank - dark;float temp2 = TSL2581_CH0 - dark;Absorbance = log10(temp1/temp2);Turbidity = (Absorbance - 0.0029)/0.004;//根据工作曲线计算斜率和截距
}void displayValue(void) {display.clearDisplay();display.setFont(&FreeSerif9pt7b);
//  display.setTextSize(1);display.setTextColor(WHITE);
//  display.setTextColor(BLACK,WHITE); // Draw 'inverse' textdisplay.setCursor(10,12);display.print(Absorbance,4);display.println(F(" A"));display.setFont();display.setCursor(89,4);display.print(TSL2581_CH0);display.setCursor(0,16);display.print(F("Dark  = "));display.print(dark);display.println(F(";"));display.print(F("Blank = "));display.print(blank);display.display();
}//************ This Loop Is called From Main Loop************************//
void GetEC(){//*********Reading Temperature Of Solution *******************//
sensors.requestTemperatures();// Send the command to get temperatures
Temperature=sensors.getTempCByIndex(0); //Stores Value in Variable//************Estimates Resistance of Liquid ****************//
digitalWrite(ECPower,HIGH);
raw= analogRead(ECPin);
raw= analogRead(ECPin);// This is not a mistake, First reading will be low beause if charged a capacitor
digitalWrite(ECPower,LOW);//***************** Converts to EC **************************//
Vdrop= (Vin*raw)/1024.0;
Rc=(Vdrop*R1)/(Vin-Vdrop);
Rc=Rc-Ra; //acounting for Digital Pin Resitance
EC = 1000/(Rc*K);//*************Compensating For Temperaure********************//
EC25  =  EC/ (1+ TemperatureCoef*(Temperature-25.0));
ppm=(EC25)*(PPMconversion*1000);//--------------GH value---------------------------------
if(ppm < 160)
{GH = ppm / 20.0;
}
else
{GH = ppm / 18.2;
}}
//************************** End OF EC Function ***************************////***This Loop Is called From Main Loop- Prints to serial usefull info ***//
void PrintReadings(){
Serial.print("Rc: ");
Serial.print(Rc);
Serial.print(" EC: ");
Serial.print(EC25);
Serial.print(" Simens  ");
Serial.print(ppm);
Serial.print(" ppm  ");
Serial.print(Temperature);
Serial.println(" *C ");};

/*开启软串口的目的是使用蓝牙传输数据给Android上位机，便于用户进行查看*/

#include <SoftwareSerial.h>      //开启软串口
SoftwareSerial mySerial(2 , 3); //第2= RX,第3= TX   //开启软串口

mySerial.begin(115200);   //  设置虚拟串口波特率

mySerial.write(ppm);
mySerial.write(ppm);
mySerial.write(Temperature); 
mySerial.write(Temperature);

2.电路图：

3.串口输出：