#include <ATtinySerialOut.h>;


// Pin Definitions
const int voltagePin = PB3;   // Analog pin for battery voltage
const int ledPin = PB0;        // Digital pin for LED

// Voltage Divider Resistor Values
const float R1 = 10000.0;    // Resistor R1 in the voltage divider (10kΩ)
const float R2 = 5000.0;     // Resistor R2 in the voltage divider (1kΩ)

// ADC Reference Voltage
const float ADC_REF_VOLTAGE = 5.0;  // Assuming 5V reference for Arduino Uno
const int ADC_RESOLUTION = 1023;    // 10-bit resolution

void setup() {
  // Initialize pins
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
delay(6000);
  // Initialize Serial Monitor for debugging
  //Serial.begin(9600);

  // Read battery voltage
  float batteryVoltage = readBatteryVoltage();
  
  // Print battery voltage to Serial Monitor
  //Serial.print("Battery Voltage: ");
  //Serial.println(batteryVoltage, 2);

  // Wait 5 seconds
  delay(5000);

  // Check if the battery voltage is above 13.5V
  if (batteryVoltage > 13.5) {
   // Serial.println("Battery voltage sufficient. Turning on LED.");
    digitalWrite(ledPin, HIGH);
    delay(1000);  // Keep the LED on for 1 second
    digitalWrite(ledPin, LOW);
  } else {
   // Serial.println("Battery voltage too low. LED will not turn on.");
  }
}

void loop() {
  // No operation in loop
}

// Function to Read Battery Voltage
float readBatteryVoltage() {
  int rawADC = analogRead(voltagePin);
  float voltageDividerOutput = (rawADC / float(ADC_RESOLUTION)) * ADC_REF_VOLTAGE;
  float batteryVoltage = voltageDividerOutput * ((R1 + R2) / R2);
  return batteryVoltage;
}