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#1 2015-12-13 16:48:20

Registered: 2015-12-13
Posts: 1

Connect ESP8266

I'm new to PiDome. I want to connect a ESP 8266 to PiDome. What would be the right process to do this? Are there any project/way, which I could use to simplify the integration? The ESP8266-14 covers a STM8 microcontroller, which I would like to use.
Thanks for any information


#2 2015-12-15 01:02:32

PiDome Dev
From: Netherland
Registered: 2015-01-07
Posts: 604

Re: Connect ESP8266

It depends on the implementation, what do you want to do with it, or better said what purpose does it get or should fulfill.


#3 2016-07-31 15:49:12

From: Belgium
Registered: 2015-09-15
Posts: 29

Re: Connect ESP8266


I've done this today using a NodeMCU v3 (interesting post comparing ESP8266 based NodeMCUs). Note the new ESP8285.
My board has DHT22 and IR LED attached. For testing, the IR led is replaced by a regular blue LED. The IR received is currently not connected, it was used to decode IR signals from a Mitsubishi IR remote.

Note my sketch is MQTT based and a modified version of the Adafruit IO sample group_sensor.ino.

Global overview :

  1. Have PiDome running on a RPi B+ with its own MQTT broker (I was using Mosquito before this)

  2. Have a NodeMCU programmed using Arduino IDE 1.6.9 (1.6.10 is out, maybe I'll upgrade but always afraid of breaking libs)

  3. Use the NodeMCU as both a sensor (DHT22 for temperature + humidity) and an emitter (IR led to a Mitsubishi HVAC)

  4. Have the NodeMCU attach to my WIFI (will have to be careful for distance, currently in the same room as router)

  5. As a first step : Display DHT info to a PiDome dashboard

  6. As a second step : Enhance sketch to also send commands to HVAC (see Controls / Climate-HVAC / Transmitting IR commands for specific HVAC device/control)

What I did so far (assuming PiDome is already working):

  1. Added a custom MQTT device "NodeMCU-DHT22"

  2. Added a new device based on this custom device (simply named A1, like some fancy name I was looking after smile)

  3. Added my A1 device to dashboard

For reference, my sketch (there are a few Adafruit IO leftovers, see AIO prefixes; also disliked the CSV format used in Adafruit IO sample).
My custom device A1 has ID 17, so device is publishing to /hooks/devices/17
More screenshots after code block.

 *  adafruit-io-basics/esp8266/group_sensor/group_sensor.ino

// Include librairies
  #include <ESP8266WiFi.h>
  #include "Adafruit_MQTT.h"
  #include "Adafruit_MQTT_Client.h"

// Global consts
  #define LOOP_DELAY 5000  // Delay in ms between loops
//#include <pins_arduino.h>
#define D0 16
#define D1 5 // I2C Bus SCL (clock)
#define D2 4 // I2C Bus SDA (data)
#define D3 0
#define D4 2 // Same as "LED_BUILTIN", but inverted logic
#define D5 14 // SPI Bus SCK (clock)
#define D6 12 // SPI Bus MISO 
#define D7 13 // SPI Bus MOSI
#define D8 15 // SPI Bus SS (CS)
#define D9 3 // RX0 (Serial console)
#define D10 1 // TX0 (Serial console)

// function prototypes
void connect(void);

/************************* WiFi Access Point *********************************/

#define WLAN_SSID "$$$ SET WIFI SSID $$$"
#define WLAN_PASS "$$$ SET WIFI PWA $$$"

/**************************** MQTT Broker Setup ******************************/

#define AIO_SERVER      "$$$ PiDome IP $$$"
#define AIO_SERVERPORT  1883
#define AIO_USERNAME    ""
#define AIO_KEY         ""

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;

// Store the MQTT server, client ID, username, and password in flash memory.
// This is required for using the Adafruit MQTT library.
// Set a unique MQTT client ID using the AIO key + the date and time the sketch
// was compiled (so this should be unique across multiple devices for a user,
// alternatively you can manually set this to a GUID or other random value).

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.

/****************************** Feeds ***************************************/

// Setup a group called 'weather' for publishing changes.
// Notice MQTT group CSV paths for AIO follow the form: <username>/groups/<groupname>/csv
const char WEATHER_FEED[] PROGMEM = AIO_USERNAME "/groups/DHT/csv";
Adafruit_MQTT_Publish weather = Adafruit_MQTT_Publish(&mqtt, WEATHER_FEED);

//const char NODES_A1_TEMP[] PROGMEM = AIO_USERNAME "/nodes/DHT/A1/temp";
//const char NODES_A1_HUMI[] PROGMEM = AIO_USERNAME "/nodes/DHT/A1/humi";
const char NODES_A1_TEMP[] PROGMEM = AIO_USERNAME "/hooks/devices/17/dht/temp";
const char NODES_A1_HUMI[] PROGMEM = AIO_USERNAME "/hooks/devices/17/dht/humi";
Adafruit_MQTT_Publish nodeA1Temp = Adafruit_MQTT_Publish(&mqtt, NODES_A1_TEMP);
Adafruit_MQTT_Publish nodeA1Humi = Adafruit_MQTT_Publish(&mqtt, NODES_A1_HUMI);

/************************** [Code] [Main setup & loop] *****************************/

void setup() {
  // General board setup
  Serial.println(F("Switching to 115200 bauds"));
  Serial.println(F("Delay before connecting to WIFI..."));
  for (int i = 1; i <= 10; i++) {
    Serial.println(F("\tSleeping . . ."));

  // WIFI and MQTT setup
  connect(); // To MQTT broker

  // Other inits

void loop() {

/******************************* [Code] [WIFI] ***************************************/

void connectToAP()
  Serial.print(F("Connecting to "));
  while (WiFi.status() != WL_CONNECTED) {

  Serial.println(F("WiFi connected"));
  Serial.print(F("IP address: "));

/******************************* [Code] [DHT22] **********************************/

// DHT sensor consts/vars
  #include "DHT.h"
  #define DHTPIN     D2     // What pin we're connected to
  #define DHTTYPE    DHT22  // Can be DHT11, DHT22 (AM2302), DHT21 (AM2301)
  DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor for normal 16mhz Arduino

void loopDHT()
  Serial.println(F("Dump DHT . . ."));
  Serial.println(F("Publish DHT to MQTT . . ."));

void initDHT()
  Serial.print(  F("\tType                = ")); Serial.println(DHTTYPE, DEC);
  Serial.print(  F("\tPin                 = ")); Serial.println(DHTPIN, DEC);

void printDHT()
  float humi    = dht.readHumidity();
  float temp    = dht.readTemperature(); // Read temperature as Celsius
  float humidex = 0;
  // Check if any reads failed
  if (isnan(humi) || isnan(temp)) {
    Serial.println(F("Failed to read from DHT sensor!"));
  } else {
    humidex = dht.convertFtoC(dht.computeHeatIndex(dht.convertCtoF(temp), humi));
    // computeHeatIndex uses Fahrenheit as input/output
    // Convert input temp C>F and resulting temp F>C
    //Serial.println(F("DHT sensor"));
    Serial.print(F("Humidity: "));
    Serial.print(F(" %\tTemperature: "));
    Serial.print(F(" *C \tHumidex: "));
    Serial.println(F(" *C"));

void publishDHT() {
  // ping MQTT broker a few times to make sure we remain connected
  // if we don't ping, reconnect MQTT broker
  if(! {
    if(! mqtt.connected())

  // Read values from sensor
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Build buffer
  char sendbuffer[80];
  char numberbuffer[20];

  // add temp feed name
  strcpy(sendbuffer, "temp,");

  // add temp value
  dtostrf(temp, 2, 2, numberbuffer);
  strcat(sendbuffer, numberbuffer);

  // add new line and humidity feed name
  strcat(sendbuffer, "\nhumidity,");
  // add humidity value
  dtostrf(humidity, 2, 2, numberbuffer);
  strcat(sendbuffer, numberbuffer);
  // Now we can publish stuff!
  Serial.print(F("Publish temp     . . .")); Serial.println(nodeA1Temp.publish(temp)     ? " Success!" : " Failed!");
  Serial.print(F("Publish humidity . . .")); Serial.println(nodeA1Humi.publish(humidity) ? " Success!" : " Failed!");

  Serial.println(F("\nSending full weather buffer: "));
  Serial.print(F("Publish weather . . .")); Serial.println(weather.publish(sendbuffer) ? " Success!" : " Failed!");

/******************************* [Code] [MQTT] **********************************/

// connect to MQTT broker
void connect() {
  Serial.print(F("Connecting to MQTT broker... "));

  int8_t ret;
  while ((ret = mqtt.connect()) != 0) {
    switch (ret) {
      case 1: Serial.println(F("Wrong protocol")); break;
      case 2: Serial.println(F("ID rejected")); break;
      case 3: Serial.println(F("Server unavail")); break;
      case 4: Serial.println(F("Bad user/pass")); break;
      case 5: Serial.println(F("Not authed")); break;
      case 6: Serial.println(F("Failed to subscribe")); break;
      default: Serial.println(F("Connection failed")); break;

    if(ret >= 0)

    Serial.println(F("Retrying connection..."));

  Serial.println(F("MQTT broker connected!"));

/***************************** [Code] [HVAC / IR] ********************************/

// Libraries
  #include "IRremoteESP8266.h"    
  #include "IRremoteInt.h"

// IR emitter consts/var
  int HVAC_IR_LED = D3;
  IRsend irsend(HVAC_IR_LED);

typedef struct {
      HvacMode                  Mode;           // Example HVAC_HOT  HvacMitsubishiMode
      int                       Temp;           // Example 21  (°c)
      HvacFanMode               FanMode;        // Example FAN_SPEED_AUTO  HvacMitsubishiFanMode
      HvacVanneMode             VanneMode;      // Example VANNE_AUTO_MOVE  HvacMitsubishiVanneMode
      int                       OnOff;          // Example false
      bool                      CommandPending; // Do we have something pending?
} MitsubishiCommand;
MitsubishiCommand hvacCmd;

void initHVAC()
  Serial.print(F("HVAC IR LED at pin : ")); Serial.println(HVAC_IR_LED);
  Blink(HVAC_IR_LED, 300);
  Blink(HVAC_IR_LED, 100);
  Blink(HVAC_IR_LED, 300);
  Blink(HVAC_IR_LED, 100);
  hvacCmd.CommandPending = false;

void loopHVAC()
  // Hack to always send something, each loop will send a command
  hvacCmd.Mode = HVAC_AUTO;
  hvacCmd.Temp = 22;
  hvacCmd.FanMode = FAN_SPEED_AUTO;
  hvacCmd.VanneMode = VANNE_AUTO_MOVE;
  hvacCmd.OnOff = false; // FALSE = ON
  hvacCmd.CommandPending = true;

  // Actual processing to send IR command

void processHVAC()
  if (hvacCmd.CommandPending) {
    // Process pending command and send it using IR
    Serial.println(F("Sending command to HVAC"));
    Serial.print(  F("  Mode:      ")); Serial.println(hvacCmd.Mode, DEC);
    Serial.print(  F("  Temp:      ")); Serial.println(hvacCmd.Temp, DEC);
    Serial.print(  F("  FanMode:   ")); Serial.println(hvacCmd.FanMode, DEC);
    Serial.print(  F("  VanneMode: ")); Serial.println(hvacCmd.VanneMode, DEC);
    Serial.print(  F("  OnOff:     ")); Serial.println(hvacCmd.OnOff, DEC);
    irsend.sendHvacMitsubishi(hvacCmd.Mode, hvacCmd.Temp, hvacCmd.FanMode, hvacCmd.VanneMode, hvacCmd.OnOff); 

    // Once sent, no more command to process
    hvacCmd.CommandPending = false;

/********************************* Support functions *********************************/
void Blink(byte PIN, int DELAY_MS)
  pinMode(PIN, OUTPUT);

Custom device :

Full setup of my custom device, basically added 2 floats for temperature/humidity :

"Your devices" showing Rasp server (ID 1) and A1 (ID 17) devices :

A1 device properties :

Device plugin: MQTT Server hook :

Dashboard with focus on A1 device :

MQTT.fx subscribed to /hooks/devices/17/# :

Arduino IDE with Serial monitor showing NodeMCU outputs:

NodeMCU on 2 breadboards (NodeMCU is too wide to fit on a single one, so I cheat!) :

Focus on the DHT22 part with resistor on data line and signal connected to D2/GPIO 4. (D3 is connected to IR Led)

Hope this will be of some help.

Last edited by amayii (2016-07-31 19:56:23)


#4 2016-07-31 15:57:41

From: Belgium
Registered: 2015-09-15
Posts: 29

Re: Connect ESP8266

(I'm not yet using this one for PiDome)
More compact "sensor node only" (DHT22) on a half breadboard.

Note the added capacitor on DHT22 power lines:


#5 2017-06-04 19:05:55

Registered: 2017-06-04
Posts: 20

Re: Connect ESP8266

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#6 2017-08-02 10:06:58

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Re: Connect ESP8266

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