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

I watched your YouTube video on this. Looks like wires are just connecting from the esp32. Is that correct? Have you tried it on thicker plastic? Say like a 55 gallon drum? Have you tried using the aluminum/metal duct tape? I am very curious.

Yes, wires straight to ESP32. I tried it on a Home Depot bucket with the copper tape and it worked as well.

That is fantastic thanks 👍

…

On Mon, May 16, 2022, 3:37 PM Charles Gomes ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ I watched your YouTube video on this. Looks like wires are just connecting from the esp32. Is that correct? Have you tried it on thicker plastic? Say like a 55 gallon drum? Have you tried using the aluminum/metal duct tape? I am very curious. Yes, wires straight to ESP32. I tried it on a Home Depot bucket with the copper tape and it worked as well. — Reply to this email directly, view it on GitHub <https://gist.github.com/425ec526a05566cceadcebe78860611d#gistcomment-4168849>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEH2IJMNRKDNPO7UBT5ECGDVKKPXDANCNFSM5KZ4SGGQ> . You are receiving this because you commented.Message ID: <charlesrg/gist: ***@***.***>

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.