HTC S8 Button replacement

Step by step video guide. The easiest way to do it your self.


Part A

Youtube link:  https://youtu.be/6FYMtZgLitw



Part B

Youtube link: https://youtu.be/1DMq98ABiz8

SIM800L EVB - Arduino Nano Diagram - Alarm system

This is a cellular based alarm system. 

Basic specifications:
Once the magnetic reed sensor recognise intrusion, the alarm system sends sms or makes a call to a predifined cellphone number

The alarm system could be deactivated through a phonecall.
If you make a call to the alarm's cellphone-number, the alarm systen being inactive for five minutes and then return to an active status.
If you send an sms to the alarm system that contains the text / character 's'  (without:  '   ').
The system responds with the current alarm status (active/inactive)


More Details: 
This is the connection diagram of an arduino nano with the sim800 evb (gsm - gprs) module.
Requirements:
1 x Mini usb cable to give power to arduino nano
2 x 10k resistor
1 lx ed
1 x arduino nano microcontroller
1 x sim800l evb gsm/gprs module
1 x 3.7v li-ion battery
1 x step up controller
1 x magnet reed sensor

Download Code:
Click Here

Hp pavillion dv6 disassembly, cooller clean , overheating repair

See my video on youtube to repair yourself easy and safe the hp pavillion dv6 notebook.
In the video you will find detailed step by step instructions

Video link here: https://youtu.be/FqwKiH2ZcIA

Galaxy s4 i9505 screen replacement

See my video on youtube. It is ideal for home users also. Very easy detailed step to achive your goal(Change your broken or faulty screen)

Youtube link Here--> https://youtu.be/jDRDTaqQpFo

Arduino HC-06 bluetooth pc-button (schema and arduino code here)

The following project gives you the ability to switch on your desktop computer over bluetooth.

The way this thing works is:  You send a command over bluetooth (by pressing a key on your phone) and the electromagnet(attached on the arduino nano) connects two cables (that are acting as a switch).

The following circuitry support 5V and 12V electromagnets with the usage of PN222A transistor as shown 

It is necessary to connect those two cables direct on the mainboard of your pc (where the power button connector is  placed)

Another alternative could be a relay switch, but in this case I used an electromagnet.
 

Video on Youtube   --> https://youtu.be/ChciUi8SHEA





Arduino Code under this line:


//  voulios.blogspot.com (Technology Blog)
//  Chrysovalantis Eleftheriadis

int button = 8;  
int state;        //State '1' activates power-on button, state '0' deactivates it.
int flag=0;       //makes sure that the serial only prints once the state


void setup() {
    pinMode (button, OUTPUT);
    Serial.begin(9600);
}

void loop() {
    //if some date is sent, reads it and saves in state
    if(Serial.available() > 0){    
      state = Serial.read();
      Serial.println(state);  
      flag=0;
    }  
   
    if (state == '0') {   
        digitalWrite(button, LOW);
        if(flag == 0){
          Serial.println("Button is deactivated");
          flag=1;
        }
    }

    //Receives '1' from serial and activates the power button for 3 secs
    else if (state == '1') {
        digitalWrite(button, HIGH);     //activates the button
        delay(3000);                    //for three seconds
        state='0';                      //sets the state to '0' (for the next loop)
        if(flag == 0){
          Serial.println("Power Button has been pressed for 3 seconds");
          flag=1;
        }
    }
          

}

Happy 2016

Happy

Usb powerbank diy(easiest way) with 18650 batteries

Parts you need for it

1. 18650 batteries (Can be taken from an old laptop battery)
2. Step up controller
3. Li-ion Charger

Video link under this line:
https://youtu.be/wuKbyflB1_s

Here are some photoes