#include <Wire.h>
#include "RTClib.h"
#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <ESP32Servo.h>
/************************* WiFi Access Point ***************************/
#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""
/************************* Adafruit.io Setup ***************************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883 // use 8883 for SSL
#define AIO_USERNAME "r9drigo"
#define AIO_KEY "aio_fYfZ06Ip8TeMijRVfAPWO12h4OlD"
#define AIO_FEED_1 "/feeds/pet-smart-feed.feed"
#define AIO_FEED_2 "/feeds/pet-smart-feed.interval"
#define AIO_FEED_3 "/feeds/pet-smart-feed.auto"
/****************************** Global State ***********************************/
#define FEED_SERVO 2
#define AUTO_LED 12
Servo servo;
int pos = 0;
RTC_DS1307 rtc;
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_USERNAME, AIO_KEY);
int interval = 1;
bool isAuto = false;
int nextHour = 0;
int nextMinute = 0;
#define CHECK_INTERVAL 10000 // 10s in ms
unsigned long lastCheck = 0;
/****************************** Feeds ***************************************/
// Publishers
Adafruit_MQTT_Publish feedPublish = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME AIO_FEED_1);
// Subscribers
Adafruit_MQTT_Subscribe feedSubscriber = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME AIO_FEED_1, MQTT_QOS_1);
Adafruit_MQTT_Subscribe intervalSubscriber = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME AIO_FEED_2, MQTT_QOS_1);
Adafruit_MQTT_Subscribe autoSubscriber = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME AIO_FEED_3, MQTT_QOS_1);
void feedCallback(char *data, uint16_t len) {
if (strcmp(data, "1") == 0) {
Serial.println("Feeding... 🥩");
moveServo();
feedPublish.publish(0);
if (isAuto) setNextTime(rtc.now());
} else {
Serial.println("Feeding concluded. 👍");
}
}
void intervalCallback(char *data, uint16_t len) {
interval = atoi(data);
Serial.print("Interval between feeds is now ");
Serial.print(interval);
Serial.println(" minute(s). ⏱");
if (isAuto) setNextTime(rtc.now());
}
void autoCallback(char *data, uint16_t len) {
if (strcmp(data, "ON") == 0) {
isAuto = true;
digitalWrite(AUTO_LED, HIGH);
Serial.println("Auto Feed is now on. ✅");
setNextTime(rtc.now());
} else {
isAuto = false;
digitalWrite(AUTO_LED, LOW);
Serial.println("Auto Feed is now off. 🚫");
}
}
void moveServo() {
for (pos = 0; pos <= 90; pos += 1) {
servo.write(pos);
delay(15);
}
for (pos = 90; pos >= 0; pos -= 1) {
servo.write(pos);
delay(15);
}
}
void setNextTime(DateTime now) {
nextHour = now.hour();
nextMinute = now.minute() + interval;
while (nextMinute >= 60) {
nextMinute -= 60;
nextHour++;
}
while (nextHour >= 24) {
nextHour -= 24;
}
Serial.print("Next feeding will occur at ");
if (nextHour < 10) Serial.print("0");
Serial.print(nextHour);
Serial.print(":");
if (nextMinute < 10) Serial.print("0");
Serial.print(nextMinute);
Serial.println(" ⏱");
}
void wifiSetup() {
// Connect to WiFi access point.
Serial.print("Connecting to ");
Serial.println(WLAN_SSID);
WiFi.begin(WLAN_SSID, WLAN_PASS, 6);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi Connected!");
}
void mqttSetup() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 10 seconds...");
mqtt.disconnect();
delay(10000); // wait 10 seconds
retries--;
if (retries == 0) {
// basically die and wait for WDT to reset me
while (1);
}
}
Serial.println("MQTT Connected!");
}
void rtcSetup() {
if (!rtc.begin()) {
Serial.println("Couldn't find RTC");
Serial.flush();
abort();
}
if (!rtc.isrunning()) {
Serial.println("RTC is NOT running, let's set the time!");
rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}
}
void setup() {
Serial.begin(115200);
rtcSetup();
wifiSetup();
servo.attach(FEED_SERVO, 500, 2400);
pinMode(AUTO_LED, OUTPUT);
// Set the callback function to be called when feed's message arrives
feedSubscriber.setCallback(feedCallback);
intervalSubscriber.setCallback(intervalCallback);
autoSubscriber.setCallback(autoCallback);
// Setup MQTT subscription for time feed.
mqtt.subscribe(&feedSubscriber);
mqtt.subscribe(&intervalSubscriber);
mqtt.subscribe(&autoSubscriber);
}
void loop() {
// Ensure the connection to the MQTT server is alive (this will make the first
// connection and automatically reconnect when disconnected). See the mqttSetup
// function definition further below.
mqttSetup();
// this is our 'wait for incoming subscription packets and callback em' busy subloop
// try to spend your time here:
mqtt.processPackets(10000);
// ping the server to keep the mqtt connection alive
// NOT required if you are publishing once every KEEPALIVE seconds
if(!mqtt.ping()) {
mqtt.disconnect();
}
if (isAuto) {
unsigned long nowInMillis = millis();
if (nowInMillis - lastCheck > CHECK_INTERVAL) {
lastCheck = nowInMillis;
DateTime now = rtc.now();
if (nextHour == now.hour() && nextMinute == now.minute()) {
feedPublish.publish(1);
}
}
}
}