GPIO'4'Cars_v1.4_no_pwm

/*

  GPIO'4'Cars NO PWM
                 ATtiny85 Pin map

                    +-\/-+
            NC PB5 1|O   |8 VCC
            NC PB3 2|    |7 PB2 A1 input_5v
 ouput_power 4 PB4 3|    |6 PB1 1  input_12v
               GND 4|    |5 PB0 NC                 
                    +----+
                    
*/

const int pin_input_5v = A1;
const int pin_input_12v = 1;
const int pin_output_power = 4;

const int analog_5v_value = 615;      // When N2 powered is of, 5v drops to 2.1V, so we compare to around 3V with the 615 analog value (0 to 1023 range)
int input_5v = 0;
bool input_12v = false;
bool power_output = false;
bool old_power_output = false;
 
void setup() {
  pinMode(pin_input_5v, INPUT);
  pinMode(pin_input_12v, INPUT);
  pinMode(pin_output_power, OUTPUT);

  clock_low();
}

void loop() {    // Set output_power pin HIGH if input_12v OR input_5v are HIGH

  input_5v = analogRead(pin_input_5v);
  input_12v = digitalRead(pin_input_12v);
  
  if ((input_12v == true) || (input_5v > analog_5v_value)) {   // input_12v OR input_5v are HIGH
    power_output = true;
  } else {
    delay(100);                                                // DEBOUNCING
    input_5v = analogRead(pin_input_5v);
    input_12v = digitalRead(pin_input_12v);
    if ((input_12v == true) || (input_5v > analog_5v_value)) {
      power_output = true;
    } else {
      power_output = false;
    }
  }

  if (power_output != old_power_output) {
    if (power_output == true) {
//      clock_high();
      digitalWrite(pin_output_power, HIGH);       // ENABLE POWER  
    } else {
      delay(1000);                                // DELAY BEFORE SHUTDOWN
      digitalWrite(pin_output_power, LOW);        // DISABLE POWER
//      clock_low();
    }
  old_power_output = power_output;
  }
}

// void clock_high() {
//   CLKPR = (1<<CLKPCE);                        // Prescaler enable
//   CLKPR = ((0<<CLKPS3) | (0<<CLKPS2) | (0<<CLKPS1) | (1<<CLKPS0));  // Clock division factor by 2  (0001)  
// }

void clock_low() {
  CLKPR = (1<<CLKPCE);                        // Prescaler enable
  CLKPR = ((0<<CLKPS3) | (1<<CLKPS2) | (0<<CLKPS1) | (0<<CLKPS0));  // Clock division factor by 16  (0100)  
}