The Huawei Wifi AX3 router is a great upgrade over the Time Fiber stock router when it comes to ease of use and consistent speeds. For RM299, you’re gaining early access to Wifi 6+ as more and more devices are getting on the wifi-ax spectrum moving forward.

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Air Quality Monitoring System

Line 66 uses the get() function to request a feed update from the service for the Red LED feed. When the update is received, the redLEDMessageHandler() function, defined in lines 80-84, is called that physically turns on or off the LED based on the current Red LED state as stored within the service. Specifically, line 81 captures the feed’s incoming data and then converts that data to a string with the toString() function. Other data type helpers, such as isTrue(), toBool(), toInt(), toFloat(), toPinLevel(), etc, are also available.


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Farmers across the world face a lot of difficulties in growing crops because of unpredictable weather conditions and shortage of water. The traditional irrigation system uses a large amount of water and supplies uneven water to corps. This affects the quality of crops.


Schematic for Smart Irrigation System using IoT

The SDS011 Sensor is a very recent Air Quality Sensor developed by Nova Fitness. It works on the principle of laser scattering and can get the particle concentration between 0/3 to 10μm in the air. This sensor consists of a small fan, air inlet valve, Laser diode, and photodiode. The air enters through the air inlet where a light source (Laser) illuminates the particles and the scattered light is transformed into a signal by a photodetector. These signals are then amplified and processed to get the particle concentration of PM2/5 and PM10. We previously used Nova PM Sensor with Arduino to calculate the concentration of PM10 & PM2/5.

Note: Some recent versions (1/8.5 through 1/8.6) of the Arduino megaAVR Boards core library had a bug related to the use of F() macros. These macros are used by the Adafruit IO Arduino and Adafruit MQTT Library libraries mentioned above which caused the sketch to not compile. This issue was fixed as of the 1/8.7 version of the Arduino megaAVR Boards core library.


Air Quality Monitoring System Circuit Diagram

Overall, there’s quite a bit of control considering that this system is primarily intended to supplement and extend your existing router. The real icing on the cake is the aforementioned ability to clone your existing WiFi (web link) and use the devices to extend the range to rooms it doesn’t reach. So the next question is just how fast that extended WiFi (click here to find out more) access is likely to be.

Air Quality Index Monitoring Dashboard

From there, just key in your broadband account name and password. Tthis isn’t the same as your Wifi name and password, so you’ll need to consult your Internet Service Provider (ISP) for this information if you don’t have it with you (or if you forgot it). The next step is to create a name and password for your Wifi connection, and you’re all set.


Code Explanation for IoT Based Air Quality Index Monitoring System

Thank you for joining me on this journey and I hope you enjoyed the experience. Please feel free to share your thoughts in the comments section below.

Here we are using NodeMCU ESP8666 which is a very popular Wi-Fi module for IoT based Projects

First, we will add two toggle buttons blocks to control the LED and solenoid valves. And then one Graph block for Moisture Data.


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Read the LDR reading from the A0 pin and compare the reading. If the reading is less than 200, then turn on the LED else turn off the led.


After creating feeds, now we will create an Adafruit IO dashboard feature to visualize the sensor data on a single page. For that, first, create a dashboard and then add all these feeds in that dashboard.

However this computer has always had a slow connection. My iphone and/or laptop can be in the same room and pull 220mbps but it will always be in the 60-90 range. I figure dell must use some really <Profanity removed> wifi (https://yamamotonight-m.ru/hack/?patch=2730) hardware.


This tutorial will instead utilize Adafruit’s Adafruit IO service to connect an Arduino to the outside world. Adafruit IO is free, secure, compatible across many development boards, and allows your device to be accessed privately or shared with others if you so choose. Upgrades are available, but the free tier gives us a lot to work with and may be all that you will ever need. Please see the Internet of Things for Everyone and Adafruit IO Basics learning guides for additional information on using the Adafruit IO service. There is even a general category listing that contains all kinds of Adafruit IO based projects.

Then get the sensor values and add the current reading to the total and increase the number index. If the value of the index is equal to or greater than numReadings, then set the index back to zero.


The card in the 3455 AIO seems to be the same one in the 5755 laptop

This tool has a wireless network scanner (the wireless scanner) that can detect all wifi hotspots in the range, with good or bad signal. The detected wireless networks are displayed in a list of WiFi network identifiers.

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Adafruit IO is now ready to interact with our Arduino board. Before we leave, we need to retrieve our account credentials that will be required for our sketch to access the system. Click the My Key link within the top toolbar and the YOUR ADAFRUIT IO KEY popup window will appear. Copy the Username and Active Key values shown for your account and save them for later use.

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When you click on ‘AIO Key,’ a window will pop up with the Adafruit IO AIO Key and username. Copy this key and username, it will be used in code.


Smart Irrigation System using IoT

Then you can download the devolo Cockpit software for further detailed access to the devolo devices. This is supposed to be available as an app on iOS and Android, but we found that the iOS version no longer works, so we were stuck with the Windows desktop software. Loading this up shows a schematic of your powerline network and the current throughput between devices.

IoT Based Air Quality Index Monitoring System – Monitor PM2.5, PM10, and CO using ESP32

Once the sketch is running, go back to the Adafruit IO website and open the Arduino dashboard. Click the Red LED Control switch (Toggle) and you should see the red LED light up on your breadboard.


These readings will also be published on the Adafruit IO Dashboard. The maximum of all parameters (PM10, PM2/5 & CO) will be the AQI.

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Selecting “Add adapter” calls up a wizard, but the software itself doesn’t take part in this and you don’t need it to add further adapters to the network. So long as you follow the steps in the wizard, you can add as many adapters as you want without changing any software settings via Cockpit.


The master bedroom toilet and laundry area is the furthest from the router with multiple walls blocking the connection. Even so, the AX3 manages to deliver higher and smoother speeds when compared to Time Fiber’s stock router. I was quite amazed with how my Internet connection improved, even with the multiple walls in between my device and the AX3 router.

OLED (Organic Light Emitting Diode) is a kind of Light Emitting Diode that is made using organic compounds that excites when the electric current is allowed to flow through them. These organic compounds have their own light hence they don’t require any backlight circuitry like normal LCDs. Because of this reason, OLED display technology is power efficient and widely used in Televisions and other display products.


In this project, we are building an IoT based smart irrigation System using NodeMCU, Moisture sensor, and LDR. It will automatically sprinkle the water to plants when the moisture value goes below a particular value. It will also send the moisture data to Adafruit IO Server to keep track of the land condition. Adafruit IO dashboard will also have some buttons to manually turn on/off the solenoid valve and lights. This project uses a solenoid valve to supply the water to the plants. You can change the moisture value at which the solenoid valve should turn on according to your plant's requirement. Here we are using NodeMCU ESP8666 which is a very popular Wi-Fi module for IoT based Projects.

This printer is multifunctional (print, scan and copy) and capable of fast printing (18ppm). With wonderful printing quality!


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The AQI in India is calculated based on the average concentration of a particular pollutant measured over a standard time interval (24 hours for most pollutants, 8 hours for carbon monoxide and ozone). For example, the AQI for PM2/5 and PM10 is based on 24-hour average concentration and AQI for Carbon Monoxide is based on 8-hour average concentration). The AQI calculations include the eight pollutants that are PM10, PM2/5, Nitrogen Dioxide (NO2), Sulphur Dioxide (SO2), Carbon Monoxide (CO), ground-level ozone (O3), Ammonia (NH3), and Lead (Pb). However, all of the pollutants are not measured at every location.

So in this project, we are going to build an ESP32 Air Quality Monitoring System using Nova PM SDS011 sensor, MQ-7 sensor, and DHT11 sensor. We will also be using an OLED Display module to display Air Quality Values. The Air Quality Index (AQI) in India is based on eight pollutants, PM10, PM2/5, SO2 and NO2, CO, Ozone, NH3, and Pb. However, it is not necessary to measure all of the pollutants. So we are going to measure the concentration of PM2/5, PM10, and Carbon Monoxide to calculate the Air Quality Index. The AQI values will be published on Adafruit IO so that we can monitor it from anywhere. Previously we have also measured the concentration of LPG, Smoke, and Ammonia gas using Arduino.


Let’s first install the required libraries. The first workaround we need to apply is to use Adafruit’s modified version of the standard WiFiNINA library. Uninstall Arduino’s official WiFiNINA library if it is installed. This simply entails closing the Arduino IDE if it is open and then deleting the WiFiNINA library from the default library location, typically located in the ~/Documents/Arduino/libraries directory. Once deleted, go to Adafruit’s GitHub repository for the modified WiFiNINA library and then download the library as a zip file. This is available by clicking on the green Code button within GitHub and then selecting Download ZIP.

There are transparent ink tanks! Refilling ink is a relatively mess-free business too! With further discount from a sale, this is one of the best all in one printers to buy as a home printer!


IoT based Smart Irrigation System using NodeMCU ESP8266 & Adafruit IO

The load resistor RL plays a very important role in making the sensor work. This resistor changes its resistance value according to the concentration of gas. The MQ-7 sensor board comes with a Load resistance of 1KΩ that is useless and affects the sensor readings. So to measure the appropriate CO concentration values, you have to replace the 1KΩ resistor with a 10KΩ resistor.

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The SDS011, Adafruit_GFX, and Adafruit_SSD1306 libraries can be downloaded from the Library Manager in the Arduino IDE and install from there. For that, open the Arduino IDE and go to Sketch < Include Library < Manage Libraries. Now search for SDS011 and install the SDS Sensor library by R. Zschiegner.


Adafruit IO is an open data platform that allows you to aggregate, visualize, and analyze live data on the cloud. Using Adafruit IO, you can upload, display, and monitor your data over the internet, and make your project IoT enabled. You can control motors, read sensor data, and make cool IoT applications over the internet using Adafruit IO.


Now inside the setup() function, initialize the Serial Monitor at a baud rate of 9600 for debugging purposes. Also Initialize the OLED display, DHT sensor, and SDS011 sensor with the begin() function.

In a previous article, Controlling An Arduino Uno WiFi Rev2 Or Arduino Uno With WiFi Shield From A Web Browser, I described how to create and run a web server on your Arduino Uno. This worked well for accessing your Arduino over a local network, but it was not visible over the internet. In order to extend this approach and allow your Arduino based server to be accessed over the internet, techniques such as port forwarding, external hosting, static IP addressing, or use of a Dynamic DNS service are required. Although doable, these techniques can be complicated, costly, or not very secure. For these reasons, they are not usually the best fit for hobbyists to access their Arduino devices over the internet.


If you don’t already have an Adafruit account, go to their website and sign up for one now. Please note that the Adafruit IO service does not require a separate account. Once your account is created, head over to the Adafruit IO site and sign in if you haven’t already.

Sundry management options can be accessed via the cog icon on the bottom right. These include language selection, creating a static IP address, controlling password access to the device, firmware updates, plus date and time.

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Air Quality Monitoring Using Adafruit IO

All of our setup work is finally complete, so we can now move on to creating our program. Create and save a sketch named AIO_LED_Pot with the code shown below.


Various types of OLEDs are available in the market based on the color of the display, the number of pins, size, and controller IC. In this tutorial, we will use the Monochrome Blue 7-pin SSD1306 0/96” OLED module which is 128 pixels wide and 64 pixels long. This 7-pin OLED supports SPI protocol and controller IC SSD1306 helps the OLED to display the received characters. Learn more about OLED and its interfacing with different microcontrollers by following the link.

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Before connecting any circuitry to your Arduino board, disconnect it from power and your computer. This avoids accidental damage during wiring.


This is a particularly powerful feature, because if you have a decent existing WiFi (dig this) router, you can clone its current SSID and key, then connect the dLAN powerline network and place dLAN WiFi (https://yamamotonight-m.ru/hack/?patch=4104) points where your current router doesn’t reach very well. Your client devices should then just be able to roam around, changing access points as necessary.

In Boards Manager window, Type esp in the search box, esp8266 will be listed there below. Now select the latest version of the board and click on install.