DIY Automatic Fish Feeder with Arduino (Without RTC)

#include <Servo.h>

// ———- Servo Setup ———-
Servo foodServo; // Servo for dispensing fish food

// ———- Constants ———-
const int SERVO_PIN = 9; // Servo control pin
const int FEED_INTERVAL = 43200000; // 12 hours in milliseconds
const int DISPENSE_ANGLE = 90; // Angle to dispense food
const int REST_ANGLE = 0; // Normal position
const int DISPENSE_TIME = 1000; // 1 second to rotate and drop food

// ———- Setup ———-
void setup() {
foodServo.attach(SERVO_PIN);
foodServo.write(REST_ANGLE); // Start in the normal position
}

// ———- Main Loop ———-
void loop() {
// Run feeding cycle
dispenseFood();

// Wait for the next feeding time
delay(FEED_INTERVAL);
}

// ———- Function: Dispense Food ———-
void dispenseFood() {
// Rotate servo to drop food
foodServo.write(DISPENSE_ANGLE);
delay(DISPENSE_TIME);

// Return to rest position
foodServo.write(REST_ANGLE);
}