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--- iothings:proiecte:2022sric:rfid_cat_feeder [2023/06/02 03:08]
maria_irina.gherman [Hardware Description]
+++ iothings:proiecte:2022sric:rfid_cat_feeder [2023/06/02 07:59] (current)
maria_irina.gherman [Project Description]
@@ Line 5: / Line 5: @@
 RFID Cat Feeder is a "smart" feeder that opens up only when a certain cat wants to eat.
-It can do this by reading an RFID tag on its collar, or ideally its microchip. The purpose
+It can do this by reading an RFID tag on a cat's collar, or ideally its microchip. The purpose
 of such a feeder is to stop a gluttonous cat from eating all the food.
-===== Hardware Description =====
+===== Hardware =====
+==== Description ====
 The hardware is relatively simple. ESP32 gets info about the RFID tag from an RFID reader.
-The door motion is
+The door motion is controlled by a servo motor. Registering a new tag is done through a button. Two
+LEDs help the user know what the feeder is currently doing.
+To have a safety mechanism so that the door doesn't close on the cat, the feeder uses an ultrasonic sensor
+to sense if there is a cat in front of it.
+==== Diagram ====
+{{:iothings:proiecte:2022sric:rfid_cat_feeder_diagram.png?600|}}
+==== Parts list ====
+  * ESP32
+  * RC522 RFID reader + RFID tag
+  * HC-SR04 ultrasonic sensor
+  * 2 x LED (1 green, 1 red)
+  * Button
+  * TowerPro SG90 servo motor
+===== Software Description =====
+==== Libraries ====
+''**#include <ESP32Servo.h>**'' - Easy control of the servo motor, a fork of Arduino's ''**Servo.h**'' that is compatible with ESP32
+''**#include <MFRC522.h>**'' - Library for reading from the RFID reader
+''**#include <SPI.h>**'' - Another library used for the RFID reader
+''**#include <NewPing.h>**'' - A library to simplify the usage of the ultrasonic sensor
+==== Pseudocode ====
+The core functionality of the feeder can be simplified in this pseudocode:
+<code>
+loop() {
+    if (register mode) {
+        turn on red led
+    } else {
+        turn off red led
+    }
+    if (button pressed) {
+        toggle register mode
+    }
+    if (reading a card) {
+        if (register mode) {
+            add card uid to vector
+        } else {
+            if (card uid is in vector) {
+                open door
+                wait 5 seconds
+                close door if no obstacle
+            } else {
+                do nothing
+            }
+        }
+    }
+}
+</code>
+The full code can be viewed on my [[https://github.com/zabbidou/RFID-Cat-Feeder|github]]
+===== Testing =====
+<html><iframe width="456" height="811" src="https://www.youtube.com/embed/VE8ORTkLVlI" title="RFID Cat Feeder Demo" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe></html>
+===== References =====
+[[https://www.electronicwings.com/esp32/rfid-rc522-interfacing-with-esp32|RC522 example]]
+[[https://dronebotworkshop.com/esp32-servo/|Servo example]]
+[[https://forum.arduino.cc/t/hc-sr04-always-returns-zero/206641/17|Ultrasonic sensor example]]