Add Makefile and refactor moisture reading to separate module

src/main.c

@@ -1,19 +1,14 @@
 #include <stdint.h>
 #include <avr/sleep.h>
 #include <avr/wdt.h>
-
-#define MOISTURE_SENSOR_A0 A0
-
-volatile bool readSensors = false;
-int16_t moistureReadingSum = 0;
-int8_t moistureReadingCount = 0;
-const uint8_t SENSOR_READINGS = 3;
+#include "config.h"
+#include "moisture.h"
 
 ISR(WDT_vect) {
     readSensors = true;
 }
 
-void watchdogs() {
+void watchdogs(void) {
     cli();
     MCUSR &= ~(1 << WDRF);
     WDTCSR |= (1 << WDCE) | (1 << WDE);
@@ -21,38 +16,24 @@ void watchdogs() {
     sei();
 }
 
-int16_t readMoisture() {
-    if (readSensors) {
-        moistureReadingSum += analogRead(MOISTURE_SENSOR_A0);
-        moistureReadingCount++;
-
-        if (moistureReadingCount >= SENSOR_READINGS) {
-            Serial.println(moistureReadingSum / SENSOR_READINGS);
-            moistureReadingSum = 0;
-            moistureReadingCount = 0;
-        } else readSensors = true;
-    }
-    readSensors = false;
-}
-
-void enterSleep() {
-    // Arduino disables USB when sleeping
-    // if using Serial, use flag : SLEEP_MODE_IDLE
-    // otherwise for deep sleep  : SLEEP_MODE_PWR_DOWN
+void enterSleep(void) {
     set_sleep_mode(SLEEP_MODE_IDLE);
-
     sleep_enable();
     sleep_cpu();
     sleep_disable();
 }
 
-void setup() {
-    pinMode(MOISTURE_SENSOR_A0, INPUT);
+void setup(void) {
     Serial.begin(9600);
+    initMoistureSensor();
     watchdogs();
 }
 
-void loop() {
-    int16_t moisture = readMoisture();
+void loop(void) {
+    triggerSensorRead();
+    int16_t result = readMoisture();
+    if (result != -1) {
+
+    }
     enterSleep();
 }