#include <Arduino.h>
#include <Tiny.h>
#include <TinyPower.h>
#include <SoftwareSerial_Tiny.h>

#define DEBUG 0
#define SEND_INTERVAL (int)(5*60/8)

// Pins
#define SENDER PIN_B4
#define TEMP_PIN A1

#if DEBUG
#define RxD PIN_B3
#define TxD PIN_B4
SoftwareSerial AttinySerial(RxD, TxD);
#endif

int readTemp();

TempSensor sensor = TempSensor(TEMP_SENSOR, SENDER);

volatile int counter = 0;
volatile bool shouldSend = true;

void setup() {

#if DEBUG
	AttinySerial.begin(9600);
	AttinySerial.println("starting...");
#endif
	sensor.setup();
	analogReference(INTERNAL);

	TinyPower::setup();
	TinyPower::enableWdt(WDTO_8S);
}

void loop() {
	if (shouldSend) {
		shouldSend = false;
		sensor.sendTemp(readTemp());
	}
	TinyPower::sleep();
}

int readTemp() {
	int reading = analogRead(TEMP_PIN);
#if DEBUG
	AttinySerial.println(reading);
#endif

	float voltage = reading * (1100 / 1024.0);
#if DEBUG
	AttinySerial.print(voltage);
	AttinySerial.println(" mili volts");
#endif

	float temperatureC = (voltage - 500) / 10;
#if DEBUG
	AttinySerial.print(temperatureC);
	AttinySerial.println(" degrees C");
#endif
	return roundf(temperatureC * 10);
}

ISR(PCINT0_vect) {
}

ISR(WDT_vect) {
	counter++;
	if (counter % SEND_INTERVAL == 0) {
		shouldSend = true;
		counter = 0;
	}
}