Hello All,
First post here! I am working on a senior project for school and have been trying to put an MQTT and WiFi code onto an ESP 32 to read temperatures through a K-type thermocouple. A lot of this is building of off a project that was done last year and we are continuing there work. So I have been getting errors such as:
(see attached Photo)
Now for the WiFi.h error I went into the one that is used and tried to delete the WiFi folder all together from either location and I run into a system error that won't let me delete either folder. So now there is that road block that I have no idea how to cross. Attached will be the code so anyone can take a look at it. I have also been referencing a website as a general model. I will include this as well. The original model seemed to use libraries to do the temperature reading and I took our already working code that get a temperature reading and replaced the existing code with that. I am not to good with Arduino code and I am trying to learn it quickly so I am hoping someone can help. Thanks!
Website Referenced: ESP32 MQTT - Publish DS18B20 Temperature Readings (Arduino IDE) | Random Nerd Tutorials
When attempting to delete WiFi.h from WindowsApps: (see Attached Photo)
#include <WiFi.h>
extern "C" {
#include "freertos/FreeRTOS.h" //unsure if this is needed for our code. refer to artical above.
#include "freertos/timers.h"
}
#include <AsyncMqttClient.h>
// Our included libraries not original to this code
#include <driver/adc.h>
#include "esp32-hal-cpu.h"
#define WIFI_SSID "jester"
#define WIFI_PASSWORD "oliver2011"
// Raspberry Pi Mosquitto MQTT Broker
#define MQTT_HOST IPAddress(192, 168, 1, 0) //need to adjust per different wifi networks
// For a cloud MQTT broker, type the domain name
//#define MQTT_HOST "example.com"
#define MQTT_PORT 1883
// Temperature MQTT Topic
#define MQTT_PUB_TEMP "esp32/model-a/Temperature" //model a is for the first test model, will change to b and c for the remaining two models
// GPIO where the DS18B20 is connected to
const int analogPin = 34; // This has been changed to try and reflect the current pin setup for us
float Temp; //Temperature, everything after Temp is added in from previous codes
float Vout; //Voltage after adc
float SenVal; // Analog Sensor value
float Beta = 0.9;//RC factor
float FilteredVal;//voltage after digital filter
void getTemp();//adc & Temp function declaration
AsyncMqttClient mqttClient;
TimerHandle_t mqttReconnectTimer;
TimerHandle_t wifiReconnectTimer;
unsigned long previousMillis = 0; // Stores last time Temperature was published
const long interval = 1000; // Interval at which to publish sensor readings (Currently set to 1 second intervals)
void connectToWifi()
{
Serial.println("Connecting to Wi-Fi...");
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}
void connectToMqtt()
{
Serial.println("Connecting to MQTT...");
mqttClient.connect();
}
void WiFiEvent(WiFiEvent_t event)
{
Serial.printf("[WiFi-event] event: %d\n", event);
switch(event) {
case SYSTEM_EVENT_STA_GOT_IP:
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
connectToMqtt();
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
Serial.println("WiFi lost connection");
xTimerStop(mqttReconnectTimer, 0); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
xTimerStart(wifiReconnectTimer, 0);
break;
}
}
void onMqttConnect(bool sessionPresent) {
Serial.println("Connected to MQTT.");
Serial.print("Session present: ");
Serial.println(sessionPresent);
}
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println("Disconnected from MQTT.");
if (WiFi.isConnected()) {
xTimerStart(mqttReconnectTimer, 0);
}
}
void onMqttPublish(uint16_t packetId) {
Serial.println("Publish acknowledged.");
Serial.print(" packetId: ");
Serial.println(packetId);
}
void setup() {
// Serial.begin(9600); //From original code this is what serial begin was set to
Serial.begin(115200);
Serial.println();
Serial.println();
mqttReconnectTimer = xTimerCreate("mqttTimer", pdMS_TO_TICKS(2000), pdFALSE, (void*)0, reinterpret_cast<TimerCallbackFunction_t>(connectToMqtt));
wifiReconnectTimer = xTimerCreate("wifiTimer", pdMS_TO_TICKS(2000), pdFALSE, (void*)0, reinterpret_cast<TimerCallbackFunction_t>(connectToWifi));
WiFi.onEvent(WiFiEvent);
mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
mqttClient.onPublish(onMqttPublish);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
// If your broker requires authentication (username and password), set them below
//mqttClient.setCredentials("REPlACE_WITH_YOUR_USER", "REPLACE_WITH_YOUR_PASSWORD");
connectToWifi();
}
void getTemp()
{
SenVal = analogRead(analogPin);//adc1_get_raw(ADC1_CHANNEL_5); //Analog value from AD8495 output pin
Vout = (SenVal *3.33)/4095; //Conversion analog to digital for the Temperature read voltage
Temp = (211.137*Vout)-221.928;//calibrated conversion of digital voltage level to Temperature
Serial.println (Vout);
Serial.println (Temp);
}
void loop()
{
unsigned long currentMillis = millis();
// Every X number of seconds (interval = 10 seconds)
// it publishes a new MQTT message
if (currentMillis - previousMillis >= interval)
{
// Save the last time a new reading was published
previousMillis = currentMillis;
// New Temperature readings
//sensors.requestTemperatures(); // I believe that in this we can add the getting Temperature process in order to get the Temperature.
getTemp(); //proposed solution to line above.
// Temp1 = getTemp(); //sensors.getTempFByIndex(0);
// Publish an MQTT message on topic esp32/model-a/Temperature
uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(Temp).c_str());
Serial.printf("Publishing on topic %s at QoS 1, packetId: ", MQTT_PUB_TEMP);
Serial.println(packetIdPub1);
Serial.printf("Message: %.2f /n", getTemp()); //error here and not sure why
}
}
