发现

 DF创客社区 产品资料库 DF创客商城
回到首页 返回首页
回到顶部 回到顶部
返回上一页 返回上一页

ESP32-C5为什么连接模拟TDS传感器无法获取数值呢？ 简单

头像 余老师 2025.10.19 8 0

测试一、C5连接oled屏幕、温湿度传感器

连接示意图：

image.png

代码
#include <Arduino.h>
#include <Wire.h>
#include "SSD1306Wire.h"  
#include <dht11.h>  // 添加DHT传感器库
dht11 DHT;

// 引脚定义
#define SDA 9
#define SCL 10
#define DHT_PIN 2        // DHT11连接到2号引脚

// 初始化OLED显示
SSD1306Wire display(0x3c, SDA, SCL);



// 温湿度变量
float temperature = 0;
float humidity = 0;

void setup() {
  Serial.begin(9600);
  
  // 初始化OLED
  display.init();
  display.setContrast(255);
  display.setFont(ArialMT_Plain_16);
  display.flipScreenVertically();  // 可选：根据安装方向调整
    
  // 初始化I2C引脚
  Wire.setPins(SDA, SCL);
  Wire.begin();
  
  // 显示启动信息
  display.clear();
  display.drawString(0, 0, "NSFZ JNFX");
  display.drawString(0, 16, "Initializing...");
  display.display();
  
  delay(2000);  // 给传感器预热时间
  
  Serial.println("DHT11 Sensor Test");
  Serial.println("=================");
}

void loop() {
  int chk;
  chk = DHT.read(DHT_PIN); 
  // 读取DHT11传感器数据
  temperature = DHT.temperature;  // 读取温度（摄氏度）
  humidity = DHT.humidity;        // 读取湿度
  
  // 检查读取是否成功
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    
    display.clear();
    display.drawString(0, 0, "NSFZ JNFX");
    display.drawString(0, 16, "Sensor Error!");
    display.drawString(0, 32, "Check DHT11");
    display.display();
    
    delay(2000);
    return;
  }
  
  // 格式化显示字符串
  String tempStr = String(temperature, 1) + "°C";
  String humStr = String(humidity, 1) + "%";
  
  // 清屏并显示数据
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  
  // 显示标题
  display.drawString(0, 0, "NSFZ JNFX");
  
  // 显示温度
  display.drawString(0, 16, "Temp:");
  display.drawString(50, 16, tempStr);
  
  // 显示湿度
  display.drawString(0, 32, "Humidity:");
  display.drawString(80, 32, humStr);
  
  // 更新显示
  display.display();
  
  // 串口输出调试信息
  Serial.printf("Temperature: %.1f°C\n", temperature);
  Serial.printf("Humidity: %.1f%%\n", humidity);
  Serial.println("-------------------");
  
  // DHT11需要至少2秒的读取间隔
  delay(2000);
}

测试结果：

数据正常显示。

image.png

测试二、C5连接oled屏幕、模拟tds传感器

连接示意图：

image.png

代码
#include <Arduino.h>
#include <Wire.h>
#include "SSD1306Wire.h"  
#include <dht11.h>  // 添加DHT传感器库
#include <EEPROM.h>
#include "GravityTDS.h"

dht11 DHT;

// 引脚定义
#define SDA 9
#define SCL 10
#define DHT_PIN 3        // DHT11连接到2号引脚
#define TdsSensorPin 2
GravityTDS gravityTds;

float tdsValue = 0;

// 初始化OLED显示
SSD1306Wire display(0x3c, SDA, SCL);

// 温湿度变量
float temperature = 0;
float humidity = 0;

void setup() {
  Serial.begin(9600);
  // 初始化OLED
  display.init();
  display.setContrast(255);
  display.setFont(ArialMT_Plain_16);
  display.flipScreenVertically();  // 可选：根据安装方向调整
    
  // 初始化I2C引脚
  Wire.setPins(SDA, SCL);
  Wire.begin();
  
  // 显示启动信息
  display.clear();
  display.drawString(0, 0, "NSFZ JNFX");
  display.drawString(0, 16, "Initializing...");
  display.display();
  
  delay(2000);  // 给传感器预热时间
  
  Serial.println("DHT11 Sensor Test");
  Serial.println("=================");

  gravityTds.setPin(TdsSensorPin);
  gravityTds.setAref(3.3);  //reference voltage on ADC, default 5.0V on Arduino UNO
  gravityTds.setAdcRange(4096);  //1024 for 10bit ADC;4096 for 12bit ADC
  gravityTds.begin();  //initialization

}

void loop() {
  analogWrite(5, 1024);  

  int chk;
  chk = DHT.read(DHT_PIN); 
  // 读取DHT11传感器数据
  temperature = DHT.temperature;  // 读取温度（摄氏度）
  humidity = DHT.humidity;        // 读取湿度
  gravityTds.setTemperature(25);  // set the temperature and execute temperature compensation
  gravityTds.update();  //sample and calculate
  tdsValue = gravityTds.getTdsValue();  // then get the value
  Serial.print(tdsValue, 0);
  Serial.println("ppm");
  
  // 检查读取是否成功
  if (isnan(temperature) || isnan(humidity)|| isnan(tdsValue)) {
    Serial.println("Failed to read from DHT sensor!");
    
    display.clear();
    display.drawString(0, 0, "NSFZ JNFX");
    display.drawString(0, 16, "Sensor Error!");
    display.drawString(0, 32, "Check DHT11");
    display.drawString(0, 48, "Check tds");
    display.display();
    
    delay(2000);
    return;
  }
  
  // 格式化显示字符串
  String tempStr = String(temperature, 1) + "°C";
  String humStr = String(humidity, 1) + "%";
  String tdsStr = String(tdsValue, 1) ;
  
  // 清屏并显示数据
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  
  // 显示标题
  display.drawString(0, 0, "NSFZ JNFX");
  
  // 显示温度
  display.drawString(0, 16, "Temp:");
  display.drawString(50, 16, tempStr);
  
  // 显示湿度
  display.drawString(0, 32, "Humidity:");
  display.drawString(80, 32, humStr);

  display.drawString(0, 48, "tds:");
  display.drawString(40, 48, tdsStr);
  
  // 更新显示
  display.display();
  
  // 串口输出调试信息
  Serial.printf("Temperature: %.1f°C\n", temperature);
  Serial.printf("Humidity: %.1f%%\n", humidity);
  Serial.printf("tds: %.1f%%\n", tdsValue);
  Serial.println("-------------------");
  
  // DHT11需要至少2秒的读取间隔
  delay(2000);
}

测试结果：

数据显示始终为0，数据异常。

测试三、UNO连接模拟tds传感器

连接示意图：

image.png
image.png

代码
#define TdsSensorPin A0 //analog pin of UNO R3
#define VREF 5.0      // analog reference voltage(Volt) of the UNO R3 ADC
#define ADCRes 1024  //ADC resolution of UNO R3
#define SCOUNT  30           // sum of sample point
int analogBuffer[SCOUNT];    // store the analog value in the array, read from ADC
int analogBufferTemp[SCOUNT];
int analogBufferIndex = 0, copyIndex = 0;
float averageVoltage = 0, tdsValue = 0, temperature = 25;

void setup()
{
  Serial.begin(115200);
  pinMode(TdsSensorPin, INPUT);
}

void loop()
{
  static unsigned long analogSampleTimepoint = millis();
  if (millis() - analogSampleTimepoint > 40U)  //every 40 milliseconds,read the analog value from the ADC
  {
    analogSampleTimepoint = millis();
    analogBuffer[analogBufferIndex] = 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[copyIndex] = analogBuffer[copyIndex];
    averageVoltage = getMedianNum(analogBufferTemp, SCOUNT) * (float)VREF / ADCRes; // 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[iFilterLen];
  for (byte i = 0; i < iFilterLen; i++)
    bTab[i] = bArray[i];
  int i, j, bTemp;
  for (j = 0; j < iFilterLen - 1; j++)
  {
    for (i = 0; i < iFilterLen - j - 1; i++)
    {
      if (bTab[i] > bTab[i + 1])
      {
        bTemp = bTab[i];
        bTab[i] = bTab[i + 1];
        bTab[i + 1] = bTemp;
      }
    }
  }
  if ((iFilterLen & 1) > 0)
    bTemp = bTab[(iFilterLen - 1) / 2];
  else
    bTemp = (bTab[iFilterLen / 2] + bTab[iFilterLen / 2 - 1]) / 2;
  return bTemp;
}

测试结果：

数据正常显示，串口数据如下图

image.png

Makelog作者原创文章，未经授权禁止转载。
#Arduino#科学探究

评论

user-avatar
余老师
余老师2023.02.03
icon
创造力411
icon
项目文章14

icon 他的勋章
    展开更多

    你可能感兴趣的