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Showing posts from April, 2017

Setup Mosquitto MQTT broker in Windows

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MQTT (Message Queueing Telemetry Transport) is a Client Server messaging transport protocol. It provides a lightweight method of carrying messages using a publish/subscribe model. The pub/sub model being lighweight makes it suitable for IOT messaging with low power devices, sensors, phones or microcontrollers. How MQTT works? MQTT follows publish/subscribe model which is alternative to server-client model where client communicates directly with server. The pub/sub model defines the client which send a message(publisher) to another client which received that message(subscriber). The subscriber and publisher are unaware of the presence of each other. The main part, which we call the Broker, which our both publisher and subscriber are aware of, filters all the coming messages and distributes them respectively.

Now we know what is MQTT and how it works. Let's dive in to set this up on Windows 7/8/10.
Mosquitto: This is an open source message broker used for handling lightweight data t…

Time scheduled electric switch controlled with Blynk app

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Most of the times when we go out of home for some days, we think of having some device that could switch ON/OFF (let's say) Refrigerator (or any other important appliance)for some hours during the day. Today, we are going to make such time scheduled electric switch which switches ON/OFF at times which we set the in our Blynk app. Woah!

Let's begin!
Things we need:
Hardware:5V relayNodeMCUJumper wiresBreadboard3V3 and 5V power sourceElectrical WiresSoftware:Arduino IDEBLYNK app It's circuit is same as we have created for our Smart Switch. So, if you already have that circuit set up, go ahead with Blynk app set up and Start playing.
Circuit:
Connections:D5 pin of NodeMCU connects to IN1 pin of 5V relay.3V3 of NodeMCU connects to 3V3 powers source and GND to GND.Vcc of relay connects to 5V source and GND to GND.Live wire is connected directly to appliance.Neutral wire from source comes to relay NC pin and another wire goes out from COM pin which is connected to the appliance.Let…

Control switch over internet with BLYNK

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Yo... yo... yo... Shippers! It's been quite a few days that we have not built anything awesome. Come let's gather up the stuff and get ready to roll. Today, we are going to control switch over internet using our very precious BLYNK app, let's call this Smart Switch. Cool!
Overview: The 5V relay connected to D5 pin of NodeMCU goes ON when D5 pin is set LOW and relay goes OFF when D5 pin is set HIGH.

We are simply going to set D5 pin HIGH to turn ON the appliance and D5 as LOW to turn OFF the appliance, considering the neutral wire is passing through the NC and COM of the relay.
Stuff required:Hardware:5V relayNodeMCUJumper wiresBreadboard3V3 and 5V power sourceElectrical WiresSoftware:Arduino IDEBLYNK appCircuit:
Connections:D5 pin of NodeMCU connects to IN1 pin of 5V relay.3V3 of NodeMCU connects to 3V3 powers source and GND to GND.Vcc of relay connects to 5V source and GND to GND.Live wire is connected directly to appliance.Neutral wire from source comes to relay NC pin and…

Home made temperature and humidity meter

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Hello Shippers! Once again, it's time to create something awesome. How about a temperature and humidity sensor controlled with NodeMCU or ESP8266 which sends the temperature of your room and our very special Blynk app shows the data with values and graphs. That sounds cool!

Let's sail.
Overview: The NodeMCU collects the temperature and humidity from DHT11 sensor and sends it to Blynk app every second. Wow!
Things we need:Hardware:NodeMCUDHT11/DHT22 sensorJumper Wires4K7 resistor3V3 power sourceSoftware:Arduino IDEBlynk app Now that we have gathered all the stuff we need. Let's connect them.
Temperature and humidity sensor circuit:
Connections:D4 pin of NodeMCU connects to pin 2 of DHT11.3V3 pin of NodeMCU connects to pin 1 of DHT11 & GND of NodeMCU to pin 4 of DHT11.4K7 ohm resistor connected between pin 1 and pin 2 of DHT11 sensor.Connect power(3.3V) to NodeMCU to make it work without USB cable. Before we dive into the code, let's setup the Blynk app to receive the d…

Controlling Servo Motor with BLYNK app over WiFi

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Hello Shippers, hope you are having a great time! Today, we are gonna build a simple project of controlling servo motor with BLYNK app over Wifi.
Overview: The slider on the blynk app will send a value to the NodeMCU/ESP8266 and this value will be written on PIN 8 and the servo rotates that much degrees. That's the way we are controlling servo motor. Ahaa!


Things we need:Hardware:Servo SG90NodeMCUMicroUSB cableJumper WiresSoftware:Arduino IDEBLYNK appCircuit:
Connections:D8 pin of NodeMCU connects to Command pin of Servo Motor.3V3 PIN of NodeMCU connects to Power PIN of Servo motor (usually RED one).GND PIN of NodeMCU connects to GND of servo motor (usually BLACK one). Simple connections, huh!
BLYNK app Setup on phone:Create a New Project in BLYNK app.Write Project Name and Select ESP8266 or NodeMCU from dropdown.An AUTH token will be sent to your registered email, note this down.Tap on the screen and add a SLIDER widget on the screen.Tap on the Widget, select Digital PIN 8 and Start…