Archive for 09.02.2018

Class : Technology

Software : Arduino IDE

Equipment : Arduino UNO Board, HC-05 Bluetooth Module, Breadboard, Jumper Wires, Fan

Challenges :
  • Making proper connections from Arduino to the components.
  • Understanding the Rx and Tx connections from Bluetooth Module to Arduino.
  • Programming the code.


To advance with our projects here in Shukhov Lab, it was necessary for us to learn how to operate and program the Arduino boards and perform basic activities. In this project I was trying to work with an Arduino and bluetooth module setup for controlling a DC Motor (A fan in this case) using a smartphone.

  Process: First it is required to assemble all components together and make the connections.


I have initially connected the bluetooth module to the breadboard and made necessary connections to the arduino board using male-male jumper cables.


The connection for the bluetooth module are as follows:

BLUETOOTH    –           ARDUINO

Txd  –  Rx

Rxd  –  Tx

Gnd  –  Gnd

Vcc  –  3.3V


Next I connected the DC powered fan to the arduino and connected it with GND for the negative terminal and PIN-8 for the positive terminal.

I chose pin 8 here because I have activated it in the code using the statement (int ledpin = 8;)

The connections to the arduino board are shown on the image below:

Finally we upload the developed code to the arduino board.

  • It is very important to disconnect the Rx and Tx cables from the bluetooth module before uploading the code or it might display an error.
  • Always disconnect the arduino power source before making any wiring changes to avoid short circuit.
  The code which I used can be found below:

char val;

int ledpin = 8;

void setup() {

pinMode(ledpin, OUTPUT);



void loop() {

if( Serial.available() )


val =;


if( val == ‘H’ )


digitalWrite(ledpin, HIGH);

} else {

digitalWrite(ledpin, LOW);




  I have also downloaded an application on my phone, from which I can send signal to the Bluetooth module.

It is necessary to download this app or a similar app. You can download one from the link below:  

After uploading the code, I disconnected the power from arduino board connected back the Rx and Tx cables and plugged back the power source into the arduino (it can be from your notebook’s USB or via 5V power adaptor)

Next I opened my bluetooth settings in my phone and paired the device with bluetooth module HC-05.

  •  In case of password prompt, use – 1234
  •  Typing H on the bluetooth app activates signal and typing anything else switches it off.

Then open the app (arduino bluetooth controller) and select the device (HC-05) from the list of paired devices and connect with the switch or terminal modes as shown below. In my case I have used the Switch mode and set the parameters for ON button as “H” and OFF button as “X”. Otherwise you can manually use the Terminal mode.

The fan rotates on sending the signal “H” (ON) and switches off on sending signal “X” (OFF) successfully.

It is demonstrated in the video below:


Class: Technology, Arduino



  • Arduino Uno
  • Breadboard Circuit
  • Jumper Wires
  • DHT11 sensor x 1
  • Mini Servo Motor x 2


  • Arduino


The idea was to program servo motors to rotate according to humidity and temperature as an input. I used two servo motors and DHT 11 sensor. When temperature gets higher than 26c, servos start rotating for 180, when the temperature goes down, they rotate back.


I prepared all the components. After I began to wire them, actually it took much time, because I didn’t know how how to do that. I started searching on for similar projects, i found some and began to create the code. When I finished it all worked well, servos were rotating according to the temperature and humidity. I was really proud of myself. You can check my code at the end of the post.


Arduino Uno code servo DHT11  
Class: Technology, Arduino
Software: Arduino 1.8.5
  • 1 Arduino Uno card
  • 1 solderless breadboard
  • 1 bipolar transistor
  • 1 LED scale
  • 1 1 kΩ resistor
  • 4 resistors with a rating of 220 Ohm
  • 8 wires “Male-male”




#define CONTROL_PIN  9
int brightness = 0;
void setup()
void loop()
{  brightness = (brightness + 1) % 256;
  analogWrite(CONTROL_PIN, brightness);


The door lock has been laser cutted with use of 2mm plastic. The door lock is used as a prototype object for Smart Cube: it is controlled by servo motor and remotely opens the door lock by usage of Smart Cube. The picture showing laser cutted part connected together by layers with Moment super glue.
Smart home lightbox prototype has been made by laser cutting in 2mm acrylic glass and 3mm plywood. LED/RGB light strip will be inserted inside. Materials: 2mm acrylic glass, 3mm plywood Software: Archicad Machine used: Laser cutter Technics: Pressfit    

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