Hi. I'm making wifi plant irrigator using ESP32 dev module and Capacitive Soil Moisture Sensor v1.2. I'm quite new at programming . I have problem with soil moisture data reading. While I'm using this code it shows correct data.
const int pin = 4;
const int Air = 3970;
const int Water = 1620;
int soilread;
int soilpercent;
void setup() {
Serial.begin(115200);
pinMode(pin, INPUT);
}
void loop() {
soilread = analogRead(pin);
soilpercent = map(soilread, Air, Water, 0, 100);
if(soilpercent>100){
Serial.println("Soil Moisture 100%");
}
if(soilpercent<0){
Serial.println("Soil Moisture 0%");
}
if(soilpercent>=0 && soilpercent <=100){
Serial.println("Soil Moisture");
Serial.print(soilpercent);
Serial.print("[%]");
}
delay(1000);
}
But when I use code with sending data to web server it always show 169, no matter if sensor is in the water or in the air.
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include <Adafruit_Sensor.h>
#include <DHT.h>
const char* ssid = " ";
const char* password = " ";
const int air = 3970;
const int water = 1620;
int soilread; //analogRead soilpin
int soilpercent;
int soilpin = 13;
#define DHTPIN 4
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
AsyncWebServer server(80);
String readSoilMoisture() {
if (soilpercent <0){
return "0";
}
if (soilpercent >100){
return "100";
}
if (soilpercent>=0 && soilpercent <=100){
return String(soilpercent);
}
}
String readDHTTemperature() {
float t = dht.readTemperature();
if (isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
}
else {
Serial.println(t);
return String(t);
}
}
String readDHTHumidity() {
float h = dht.readHumidity();
if (isnan(h)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
}
else {
Serial.println(h);
return String(h);
}
}
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<style>
html {
font-family: Arial;
display: inline-block;
margin: 0px auto;
text-align: center;
}
h2 { font-size: 3.0rem; }
p { font-size: 3.0rem; }
.units { font-size: 1.2rem; }
.dht-labels{
font-size: 1.5rem;
vertical-align:middle;
padding-bottom: 15px;
}
</style>
</head>
<body>
<h2>Sensor data</h2>
<p>
<i class="fas fa-seedling"" style="color:#09993e;"></i>
<span class="soil-labels">Soil Moisture</span>
<span id="soilmoisture">%SOILMOISTURE%</span>
<sup class="units">%</sup>
</p>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="dht-labels">Air Temperature</span>
<span id="temperature">%TEMPERATURE%</span>
<sup class="units">°C</sup>
</p>
<p>
<i class="fas fa-tint" style="color:#00add6;"></i>
<span class="dht-labels">Air Humidity</span>
<span id="humidity">%HUMIDITY%</span>
<sup class="units">%</sup>
</p>
</body>
<script>
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("soilmoisture").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/soilmoisture", true);
xhttp.send();
}, 5000 ) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperature").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperature", true);
xhttp.send();
}, 10000 ) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("humidity").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/humidity", true);
xhttp.send();
}, 10000 ) ;
</script>
</html>)rawliteral";
String processor(const String& var){
//Serial.println(var);
if(var == "TEMPERATURE"){
return readDHTTemperature();
}
else if(var == "HUMIDITY"){
return readDHTHumidity();
}
else if(var == "SOILMOISTURE"){
return readSoilMoisture();
}
return String();
}
void setup(){
Serial.begin(115200);
pinMode(soilpin, INPUT);
dht.begin();
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
// Print ESP32 Local IP Address
Serial.println(WiFi.localIP());
// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor);
});
server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDHTTemperature().c_str());
});
server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDHTHumidity().c_str());
});
server.on("/soilmoisture", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readSoilMoisture().c_str());
});
// Start server
server.begin();
}
void loop(){
soilread = analogRead(soilpin);
soilpercent = map(soilread, air, water, 0, 100);
Serial.println(soilpercent);
delay(1000);
}
This code is from ESP32 DHT11/DHT22 Web Server using Arduino IDE | Random Nerd Tutorials
I changed it that way that it send soil moisture data to web server. But as I mentioned received sensor data is wrong.
How can I fix this.