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@j7nn7k
Last active May 2, 2019
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Wifi thermometer powerd by arduino compatible esp8266, DTH11 sensor and Azure IoT Hub
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <WiFiUdp.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <sys/time.h>
#include <AzureIoTHub.h>
#include <AzureIoTProtocol_MQTT.h>
#include <ArduinoJson.h>
#include <DHT.h>
#define DHTTYPE DHT11
#define DHTPIN 13
DHT dht(DHTPIN, DHTTYPE);
float humidity, temperature; // Values read from sensor
#define IOT_CONFIG_CONNECTION_STRING "GET_THIS_FROM_AZURE_IOT_HUB"
#define DEVICE_ID "YOUR_DEVICES_ID"
#define WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PW "YOUR_WIFI_PW"
#define MESSAGE_MAX_LEN 256
static bool messagePending = false;
static IOTHUB_CLIENT_LL_HANDLE iotHubClientHandle;
// Time to sleep (in seconds):
const int sleepTimeSec = 10;
void setup()
{
delay(1000);
Serial.begin(115200);
connect();
initTime();
iotHubClientHandle = IoTHubClient_LL_CreateFromConnectionString(IOT_CONFIG_CONNECTION_STRING, MQTT_Protocol);
if (iotHubClientHandle == NULL)
{
Serial.println("Failed on IoTHubClient_CreateFromConnectionString.");
while (1);
}
}
void loop()
{
if (!messagePending){
readSensorData();
char messagePayload[MESSAGE_MAX_LEN];
composeMessage(messagePayload);
queueMessage(iotHubClientHandle, messagePayload);
Serial.println("mesage queued - not sent yet");
}
IoTHubClient_LL_DoWork(iotHubClientHandle);
Serial.println("-");
delay(500);
}
void connect()
{
if (WiFi.status() == WL_CONNECTED)
{
return;
}
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(WIFI_SSID);
WiFi.begin(WIFI_SSID, WIFI_PW);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}
void initTime() {
time_t epochTime;
configTime(0, 0, "pool.ntp.org", "time.nist.gov");
while (true) {
epochTime = time(NULL);
if (epochTime == 0) {
Serial.println("Fetching NTP epoch time failed! Waiting 2 seconds to retry.");
delay(2000);
} else {
Serial.print("Fetched NTP epoch time is: ");
Serial.println(epochTime);
break;
}
}
}
void readSensorData() {
delay(2000);
humidity = dht.readHumidity(); // Read humidity (percent)
temperature = dht.readTemperature(); // Read temperature as Celsius
}
void composeMessage(char *payload)
{
StaticJsonBuffer<MESSAGE_MAX_LEN> jsonBuffer;
JsonObject &root = jsonBuffer.createObject();
root["deviceId"] = DEVICE_ID;
// NAN is not the valid json, change it to NULL
if (std::isnan(temperature))
{
root["temperature"] = NULL;
}
else
{
root["temperature"] = temperature;
}
if (std::isnan(humidity))
{
root["humidity"] = NULL;
}
else
{
root["humidity"] = humidity;
}
root.printTo(payload, MESSAGE_MAX_LEN);
}
static void queueMessage(IOTHUB_CLIENT_LL_HANDLE iotHubClientHandle, char *buffer)
{
IOTHUB_MESSAGE_HANDLE messageHandle = IoTHubMessage_CreateFromByteArray((const unsigned char *)buffer, strlen(buffer));
if (messageHandle == NULL)
{
Serial.println("Unable to create a new IoTHubMessage.");
}
else
{
Serial.printf("Queueing message: %s.\r\n", buffer);
if (IoTHubClient_LL_SendEventAsync(iotHubClientHandle, messageHandle, onMessageSentCallback, NULL) != IOTHUB_CLIENT_OK)
{
Serial.println("Failed to hand over the message to IoTHubClient.");
}
else
{
messagePending = true;
Serial.println("IoTHubClient queued the message for delivery.");
}
IoTHubMessage_Destroy(messageHandle);
}
}
static void onMessageSentCallback(IOTHUB_CLIENT_CONFIRMATION_RESULT result, void *userContextCallback)
{
if (IOTHUB_CLIENT_CONFIRMATION_OK == result)
{
Serial.println("Message sent! Going to deep sleep!");
// remember to tie the RST pin to GPIO 16 on the ESP8266
// https://www.losant.com/blog/making-the-esp8266-low-powered-with-deep-sleep
ESP.deepSleep(sleepTimeSec * 1000000);
delay(5000);
}
else
{
Serial.println("Failed to send message to Azure IoT Hub");
}
messagePending = false;
}
@j7nn7k
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j7nn7k commented Dec 10, 2017

Note that you have to install a couple of dependencies for the code to compile. The required dependencies are:

  • AzureIoTHub
  • AzureIoTUtility
  • AzureIoTProtocol_MQTT
  • ArduinoJson
  • DHT sensor library
  • Adafruit Unified Sensor

@Bunkr1
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Bunkr1 commented Jan 8, 2019

Jannik,

I wounder if you could help me, I tried to load your code onto Arduino IDE and I'm getting this error code? Any ideas/pointers please?
Arduino: 1.8.8 (Windows 7), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Enabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

Build options changed, rebuilding all
In file included from C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\libraries\ESP8266WiFi\src/WiFiClient.h:25:0,

             from C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:39,

             from C:\Users\Sugden-brook\Documents\Arduino\libraries\AzureIoTUtility\src\adapters\sslClient_arduino.cpp:9:

c:\users\sugden-brook\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits\random.tcc: In member function 'void std::poisson_distribution<_IntType>::param_type::_M_initialize()':

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

c:\users\sugden-brook\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits\random.tcc: In member function 'void std::binomial_distribution<_IntType>::param_type::_M_initialize()':

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

exit status 1
Error compiling for board NodeMCU 0.9 (ESP-12 Module).

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

@kevinunger
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kevinunger commented Mar 5, 2019

Jannik,

I wounder if you could help me, I tried to load your code onto Arduino IDE and I'm getting this error code? Any ideas/pointers please?
Arduino: 1.8.8 (Windows 7), Board: "NodeMCU 0.9 (ESP-12 Module), 80 MHz, Flash, Enabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200"

Build options changed, rebuilding all
In file included from C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\libraries\ESP8266WiFi\src/WiFiClient.h:25:0,

             from C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\libraries\ESP8266WiFi\src/ESP8266WiFi.h:39,

             from C:\Users\Sugden-brook\Documents\Arduino\libraries\AzureIoTUtility\src\adapters\sslClient_arduino.cpp:9:

c:\users\sugden-brook\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits\random.tcc: In member function 'void std::poisson_distribution<_IntType>::param_type::_M_initialize()':

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

c:\users\sugden-brook\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits\random.tcc: In member function 'void std::binomial_distribution<_IntType>::param_type::_M_initialize()':

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

C:\Users\Sugden-brook\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.0-beta2\cores\esp8266/Arduino.h:137:22: error: expected unqualified-id before '(' token

#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))

                  ^

exit status 1
Error compiling for board NodeMCU 0.9 (ESP-12 Module).

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

I had this error too. 'Fixed' it by using the 2.4.0 version of the ESP8266. Select this version instead of the 2.5.0 version in the arduino board manager.

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