Black and decker pivot 18v lithium repair(power on failure), battery replacement

This handheld vacuum(Black and decker pivot lithium 18v) had power on failure.

It could charge but it couldn't start working. 

After a replacement of the thermal fuse. It works properly. See the step by step video instructions. 

Video link below this line: : https://youtu.be/BR19-Jv4ZVQ


Photoes:

Arduino relay, control 220v devices code and hardware(circuit diagram)

At the first part of the video (Part-A), I will explain each line of the small code.
At the second part of the video (Part-B) I will build the hardware.

I  build a solution to power on a water pump(or other 220v devices) when there is water overflow.
You can do it to power on other AC (220V) appliances such as Lights, TVs, etc.


Part-A (Code explanation).

Video link for Part-A below this line:
https://youtu.be/mQLTWnA4ZHI


Download code here: Download link
or copy the code unter this line:


#define relay1 4             //Defines pin 4
#define relay2 7             //Defines pin 7         
#define sensor 2          //Define sensor pin 2 (input pin)
#define alwaysHigh 10     //gives 5v to the sensor
//#define ledPin 8 

int sensorState=0;    //keeps the reading of sensor pin 2 (high or low)
int flag=0;     // Takes values 0 or 1. When the sensorState changes.

void setup() {
 // Open serial communications and wait for port to open:
  Serial.begin(9600);

    //pinMode(ledPin, OUTPUT);  // Set the LED pin as output
    pinMode(sensor, INPUT);     // Set the Sensor pin as input
 
    pinMode(relay1, OUTPUT);     
    pinMode(relay2, OUTPUT);
    pinMode (alwaysHigh, OUTPUT);   //5V sourch, gives power to sensor
 
 
    digitalWrite(relay1, !(LOW));  //OFF
    digitalWrite(relay2, !(LOW));  //OFF
    digitalWrite(alwaysHigh, HIGH); //ON

    Serial.println("Relay-1 is OFF");
    Serial.println ("Relay-2 is OFF");
    Serial.print("\n");
}


void loop() {
    sensorState= digitalRead(sensor);
    //Serial.println(sensorState);
    if (sensorState == HIGH) {               // check if the sensor is in water(short circuit)
      digitalWrite(relay1, !(HIGH));                  // turns Relay1 ON
      digitalWrite(relay2, !(HIGH));                  // turns Relay2 ON
      if (flag==0){
        flag=1;
        Serial.println("relays are now ON");
      }
    }
    else{
      digitalWrite(relay1, !(LOW));             // turns Relay1 OFF                       
      digitalWrite(relay2, !(LOW));             // turns Relay2 OFF
      if (flag==1){
        flag=0;
        Serial.println("relays are now OFF");
      }
    }
} //loop end bracket


Part-B (Hardware)

Video link for Part-B below this line:
https://youtu.be/mimGR6aEHNA