Move main to C++ file

src/main.cpp

@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#include "config.h"
+#include "moisture.h"
+
+ISR(WDT_vect) {
+    readSensors = true;
+}
+
+void watchdogs(void) {
+    cli();
+    MCUSR &= ~(1 << WDRF);
+    WDTCSR |= (1 << WDCE) | (1 << WDE);
+    WDTCSR = (1 << WDIE) | (1 << WDP3) | (1 << WDP0);
+    sei();
+}
+
+void enterSleep(void) {
+    set_sleep_mode(SLEEP_MODE_IDLE);
+    sleep_enable();
+    sleep_cpu();
+    sleep_disable();
+}
+
+void setup(void) {
+    Serial.begin(9600);
+    initMoistureSensor();
+    watchdogs();
+}
+
+void loop(void) {
+    if (readSensors) {
+        int16_t result = readMoisture();
+        if (result != -1) {
+            Serial.println(result);
+            readSensors = false;
+        }
+    }
+
+    enterSleep();
+}