airgradient_mqtt.ino

gistfile1.txt

/**
 * This sketch connects an AirGradient DIY sensor to a WiFi network, and sends
 * these metrics via MQTT. Adapted from original by Jeff Geerling.
 */

#include <AirGradient.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

#include <Wire.h>
#include "SSD1306Wire.h"

AirGradient ag = AirGradient();

// Config ----------------------------------------------------------------------

// Optional.
const char* deviceId = "airgradient";

// Hardware options for AirGradient DIY sensor.
const bool hasPM = true;
const bool hasCO2 = true;
const bool hasSHT = true;

// WiFi and IP connection info.
const char* ssid = "";
const char* password = "";
const int port = 9926;

// MQTT connection info.
const char* mqtt_user = "airgradient";
const char* mqtt_pass = "";
const char* clientId = "airgradient";
const char* MQTTtopic = "airgradient";

// Uncomment the line below to configure a static IP address.
// #define staticip
#ifdef staticip
IPAddress static_ip(192, 168, 2, 15);
IPAddress gateway(192, 168, 2, 1);
IPAddress subnet(255, 255, 255, 0);
#endif

//The mqtt server
IPAddress server(192, 168, 2 ,13);

// The frequency of measurement updates.
const int updateFrequency = 5000;
// The frequency of mqtt messages;
const int MQTTFrequency = 60000;

// For housekeeping.
long lastUpdate = millis();
long lastMQTT = millis();
int counter = 0;
String payload = "";

// Config End ------------------------------------------------------------------

SSD1306Wire display(0x3c, SDA, SCL);
WiFiClient espClient;
PubSubClient client(server, 1883, espClient);



void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    // Attempt to connect
    if (client.connect(clientId, mqtt_user, mqtt_pass)) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      // client.publish(MQTTTopic, "Starting...");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      yield();
      delay(5000);
    }
  }
}


void setup() {
  Serial.begin(57600);

  // Init Display.
  display.init();
  display.flipScreenVertically();
  showTextRectangle("Init", String(ESP.getChipId(),HEX),true);



  // Set static IP address if configured.
  #ifdef staticip
  WiFi.config(static_ip,gateway,subnet);
  #endif
  
  // Set WiFi mode to client (without this it may try to act as an AP).
  WiFi.mode(WIFI_STA);

  // Configure Hostname
  if ((deviceId != NULL) && (deviceId[0] == '\0')) {
    Serial.printf("No Device ID is Defined, Defaulting to board defaults");
  }
  else {
    // wifi_station_set_hostname(deviceId); # 'wifi_station_set_hostname' was not declared in this scope

    WiFi.hostname(deviceId);
  }
  
  // Setup and wait for WiFi.
  WiFi.begin(ssid, password);
  Serial.println("");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    showTextRectangle("Trying to", "connect...", true);
    Serial.print(".");
  }

  // Enable enabled sensors.
  if (hasPM) ag.PMS_Init();
  if (hasCO2) ag.CO2_Init();
  if (hasSHT) ag.TMP_RH_Init(0x44);

  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.print("MAC address: ");
  Serial.println(WiFi.macAddress());
  Serial.print("Hostname: ");
  Serial.println(WiFi.hostname());

  client.setServer(server, 1883);
}

void loop() {
  long t = millis();

  updateScreen(t);
  
  payload = GenerateMetrics();
  Serial.println("");
  Serial.println("payload: ");
  Serial.print(payload);
  if (!client.connected()) {
    reconnect();
  }
  
  sendMQTT(t, payload);
  
}


String GenerateMetrics() {
  String message = "{\"id\":\"" + String(deviceId) + "\",\"mac\":\"" + WiFi.macAddress().c_str() + "\"";

  if (hasPM) {
    int stat = ag.getPM2_Raw();

    // pm02 Particulate Matter PM2.5 value
    message += ",\"pm02\":" + String(stat);
  }

  if (hasCO2) {
    int stat = ag.getCO2_Raw();
    //rco2 CO2 value, in ppm
    message += ",\"rco2\":" + String(stat);
  }

  if (hasSHT) {
    TMP_RH stat = ag.periodicFetchData();

    //atmp Temperature, in degrees Celsius";
    message += ",\"atmp\":" + String(stat.t);

    //Relative humidity, in percent";
    message += ",\"rhum\":" + String(stat.rh);
  }
  message += "\}";

  return message;
}


// DISPLAY
void showTextRectangle(String ln1, String ln2, boolean small) {
  display.clear();
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  if (small) {
    display.setFont(ArialMT_Plain_16);
  } else {
    display.setFont(ArialMT_Plain_24);
  }
  display.drawString(32, 16, ln1);
  display.drawString(32, 36, ln2);
  display.display();
}

void updateScreen(long now) {
  if ((now - lastUpdate) > updateFrequency) {
    // Take a measurement at a fixed interval.
    switch (counter) {
      case 0:
        if (hasPM) {
          int stat = ag.getPM2_Raw();
          showTextRectangle("PM2",String(stat),false);
        }
        break;
      case 1:
        if (hasCO2) {
          int stat = ag.getCO2_Raw();
          showTextRectangle("CO2", String(stat), false);
        }
        break;
      case 2:
        if (hasSHT) {
          TMP_RH stat = ag.periodicFetchData();
          showTextRectangle("TMP", String(stat.t, 1) + "C", false);
        }
        break;
      case 3:
        if (hasSHT) {
          TMP_RH stat = ag.periodicFetchData();
          showTextRectangle("HUM", String(stat.rh) + "%", false);
        }
        break;
    }
    counter++;
    if (counter > 3) counter = 0;
    lastUpdate = millis();
  }
}


void sendMQTT(long now, String payload) {
  // send out the MQTT message.
  if ((now - lastMQTT) > MQTTFrequency) {
    int succ = false;
    int attempts = 10;
    while (succ == false && attempts-- > 0) {
        succ = client.publish(MQTTtopic, payload.c_str());
        Serial.print('Sending: ');
        Serial.println(succ);
        yield();
        delay(500);
    lastMQTT = millis();
    }
  }
}

as a newbie I copied the sktech and tried compiling
got these errors
no file or directory for PubSubClient.h so I excluded it
then got this in the end
no matching function call for AirGradient::AirGradient()

Also how do I configure MQTT for this? Just registered an account

any hints appreciated

lastly, very neat coding formatting

complete log attached..................

/Arduino/mqtt-air-grad/mqtt-air-grad.ino:250:22: warning: character constant too long for its type
250 | Serial.print('Sending: ');
| ^~~~~~~~~~~
mqtt-air-grad:14:30: error: no matching function for call to 'AirGradient::AirGradient()'
14 | AirGradient ag = AirGradient();
| ^
In file included from //Arduino/mqtt-air-grad/mqtt-air-grad.ino:7:
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:27:3: note: candidate: 'AirGradient::AirGradient(BoardType)'
27 | AirGradient(BoardType type);
| ^~~~~~~~~~~
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:27:3: note: candidate expects 1 argument, 0 provided
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:25:7: note: candidate: 'constexpr AirGradient::AirGradient(const AirGradient&)'
25 | class AirGradient {
| ^~~~~~~~~~~
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:25:7: note: candidate expects 1 argument, 0 provided
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:25:7: note: candidate: 'constexpr AirGradient::AirGradient(AirGradient&&)'
//Arduino/libraries/AirGradient_Air_Quality_Sensor/src/AirGradient.h:25:7: note: candidate expects 1 argument, 0 provided
mqtt-air-grad:63:1: error: 'PubSubClient' does not name a type
63 | PubSubClient client(server, 1883, espClient);
| ^~~~~~~~~~~~
//Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'void reconnect()':
mqtt-air-grad:69:11: error: 'client' was not declared in this scope; did you mean 'Client'?
69 | while (!client.connected()) {
| ^~~~~~
| Client
//Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'void setup()':
mqtt-air-grad:127:17: error: 'class AirGradient' has no member named 'PMS_Init'
127 | if (hasPM) ag.PMS_Init();
| ^~~~~~~~
mqtt-air-grad:128:18: error: 'class AirGradient' has no member named 'CO2_Init'
128 | if (hasCO2) ag.CO2_Init();
| ^~~~~~~~
mqtt-air-grad:129:18: error: 'class AirGradient' has no member named 'TMP_RH_Init'
129 | if (hasSHT) ag.TMP_RH_Init(0x44);
| ^~~~~~~~~~~
mqtt-air-grad:141:3: error: 'client' was not declared in this scope; did you mean 'Client'?
141 | client.setServer(server, 1883);
| ^~~~~~
| Client
//Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'void loop()':
mqtt-air-grad:153:8: error: 'client' was not declared in this scope; did you mean 'Client'?
153 | if (!client.connected()) {
| ^~~~~~
| Client
//Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'String GenerateMetrics()':
mqtt-air-grad:166:19: error: 'class AirGradient' has no member named 'getPM2_Raw'
166 | int stat = ag.getPM2_Raw();
| ^~~~~~~~~~
mqtt-air-grad:173:19: error: 'class AirGradient' has no member named 'getCO2_Raw'
173 | int stat = ag.getCO2_Raw();
| ^~~~~~~~~~
mqtt-air-grad:179:5: error: 'TMP_RH' was not declared in this scope
179 | TMP_RH stat = ag.periodicFetchData();
| ^~~~~~
mqtt-air-grad:182:38: error: 'stat' was not declared in this scope
182 | message += ","atmp":" + String(stat.t);
| ^~~~
//Arduino/mqtt-air-grad/mqtt-air-grad.ino:187:14: warning: unknown escape sequence: '}'
187 | message += "}";
| ^~~~
//Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'void updateScreen(long int)':
mqtt-air-grad:213:25: error: 'class AirGradient' has no member named 'getPM2_Raw'
213 | int stat = ag.getPM2_Raw();
| ^~~~~~~~~~
mqtt-air-grad:219:25: error: 'class AirGradient' has no member named 'getCO2_Raw'
219 | int stat = ag.getCO2_Raw();
| ^~~~~~~~~~
mqtt-air-grad:225:11: error: 'TMP_RH' was not declared in this scope
225 | TMP_RH stat = ag.periodicFetchData();
| ^~~~~~
mqtt-air-grad:226:43: error: 'stat' was not declared in this scope
226 | showTextRectangle("TMP", String(stat.t, 1) + "C", false);
| ^~~~
mqtt-air-grad:231:11: error: 'TMP_RH' was not declared in this scope
231 | TMP_RH stat = ag.periodicFetchData();
| ^~~~~~
mqtt-air-grad:232:43: error: 'stat' was not declared in this scope
232 | showTextRectangle("HUM", String(stat.rh) + "%", false);
| ^~~~
/~/Arduino/mqtt-air-grad/mqtt-air-grad.ino: In function 'void sendMQTT(long int, String)':
mqtt-air-grad:249:16: error: 'client' was not declared in this scope; did you mean 'Client'?
249 | succ = client.publish(MQTTtopic, payload.c_str());
| ^~~~~~
| Client
exit status 1
no matching function for call to 'AirGradient::AirGradient()'