ESP32 Touch Capacitive with WIFI OTA and sending readings over UDP

gistfile1.txt

#include <WiFi.h>
#include <ESPmDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>


const char* ssid = "WIFI_SSID";
const char* password = "WIFI_PASSWORD";

const char * udpAddress = "192.168.10.6";  //IP TO SEND UDP Packets with Reading. (UDP so there is no need of a connection state)
const int udpPort = 44444;
WiFiUDP udp;

//variabls for blinking an LED with Millis
const int led = 2; // ESP32 Pin to which onboard LED is connected
unsigned long previousMillis = 0;  // will store last time LED was updated
const long interval = 1000;  // interval at which to blink (milliseconds)
int ledState = LOW;  // ledState used to set the LED

void setup() {

  pinMode(led, OUTPUT);
  
  Serial.begin(115200);
  Serial.println("Booting");
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.println("Connection Failed! Rebooting...");
    delay(5000);
    ESP.restart();
  }

  // Port defaults to 3232
  // ArduinoOTA.setPort(3232);

  // Hostname defaults to esp3232-[MAC]
  // ArduinoOTA.setHostname("myesp32");

  // No authentication by default
  // ArduinoOTA.setPassword("admin");

  // Password can be set with it's md5 value as well
  // MD5(admin) = 21232f297a57a5a743894a0e4a801fc3
  // ArduinoOTA.setPasswordHash("21232f297a57a5a743894a0e4a801fc3");

  ArduinoOTA
    .onStart([]() {
      String type;
      if (ArduinoOTA.getCommand() == U_FLASH)
        type = "sketch";
      else // U_SPIFFS
        type = "filesystem";

      // NOTE: if updating SPIFFS this would be the place to unmount SPIFFS using SPIFFS.end()
      Serial.println("Start updating " + type);
    })
    .onEnd([]() {
      Serial.println("\nEnd");
    })
    .onProgress([](unsigned int progress, unsigned int total) {
      Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
    })
    .onError([](ota_error_t error) {
      Serial.printf("Error[%u]: ", error);
      if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
      else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
      else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
      else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
      else if (error == OTA_END_ERROR) Serial.println("End Failed");
    });

  ArduinoOTA.begin();

  Serial.println("Ready");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  udp.begin(udpPort);
}

void loop() {
  ArduinoOTA.handle();

  //loop to blink without delay
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
  // save the last time you blinked the LED
  previousMillis = currentMillis;
  // if the LED is off turn it on and vice-versa:
  ledState = not(ledState);
  // set the LED with the ledState of the variable:
  digitalWrite(led,  ledState);
  Serial.println(touchRead(T0));  // get value using T0
  
  //data will be sent to server
  uint8_t buffer[50] = "Reading: \n";
  char cstr[50];
  sprintf_P(cstr, (PGM_P)F("T0 Level: %d, T3 Level %d.\n"),touchRead(T0),touchRead(T3));
  //send hello world to server
  udp.beginPacket(udpAddress, udpPort);
  //udp.write(buffer,sizeof(buffer) );
  //udp.print(touchRead(T0));
  udp.print(cstr);
  udp.endPacket();
  memset(buffer, 0, 50);
  }
}
//This code gave 23 levels without grounded strip and 29 levels grounded

how did you guys get the range up to 700 on arduino ide??

Hello,

Thank you for your post. I am trying to run this code directly from my pc and not through a wireless adapter. Will it work? Also, I cant find the ESPmDNS on the library manager. Any suggestions? I however found MDNS_Generic. Is that the same by any chance?

Thank you for your time.

Edit: So I solved this problem by manually adding the ESPmDNS library from https://github.com/espressif/arduino-esp32/tree/master/libraries/ESPmDNS

Now I have this error

Arduino: 1.8.19 (Windows 7), Board: "Arduino Uno"
In file included from C:\Users*********\Desktop\sketch_dec27a\sketch_dec27a.ino:2:0:
C:\Users**********\Documents\Arduino\libraries\ESPmDNS\src/ESPmDNS.h:45:10: fatal error: IPv6Address.h: No such file or directory
#include "IPv6Address.h"

      ^~~~~~~~~~~~~~~

compilation terminated.
exit status 1
Error compiling for board Arduino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Any help is appreciated.

Thank you

This might be too late for you, but I'll chime in, in case anyone else is curious: I assume you're getting the error because an arduino Uno doesn't have a wifi module onboard, whereas an esp32 does.