Question

In a certain chemical processing plant a liquid chemical element is used in a manufacturing process Said chemical element is stored in three different tanks. A level sensor in each tank generates a voltage at HIGH level when the level of liquid in the tank falls below 25%. Design the complete circuit to monitor the level of the chemical element that lights an alarm when the level of at least two tanks drops below 25%. Implement the solution using the eArduino microcontroller 03 100 sh Spain International Sort)

Answer 1

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|________|= A goes hight when it falls below 25 % and there are three tanks B and C

The solution is (A&B)||(B&C)||(C&A) which lights up when atleast 2 tanks goes below 25 % of the value

To implement in arduino. the code is given below with a b c as input pins 10, 11 and 12 and 13 as output pin

void setup() {
  
pinMode(10, INPUT);

pinMode(11, INPUT);

pinMode(12, INPUT);

pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {

boolean a = digitalRead(10);

boolean b = digitalRead(11);

boolean c = digitalRead(12);

if( a&b)||(b&c)||(c&&a){

  digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)

}
}