Hello Cat – Automated Pet Feeder (2018)

Hello Cat is an IoT pet-feeding system built on the ATmega328P (Arduino) platform. Designed for automated cat and dog feeding, the device receives schedule triggers and manual commands over Bluetooth via a dedicated Android application to operate a dispensing servo motor.

Key Features

• Custom Android Management App: Set feeding schedules, adjust dispensing times, and manually trigger feed cycles from a smartphone interface.
• Bluetooth Connectivity: Wireless communication using the HC-05 Bluetooth module operating over UART (SoftwareSerial).
• High-Torque Servo Mechanism: Uses an MG995 servo motor powered by an external supply to control the feeding dispenser hatch.
• Limit Switch & Signal Feedback: Integrated limit switch on pin 2 paired with a status LED for feedback during operation.
• Hardware Protection & Logic: Custom resistor voltage divider ($22,\text{k}\Omega$ / $10,\text{k}\Omega$) on the RX line to match logic signal levels for the HC-05.

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App Interface

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Hardware & Circuit Architecture

Component	Description / Wiring
Microcontroller	ATmega328P / Arduino Uno
Servo Motor	MG995 high-torque servo connected to Pin 8 (Powered by external 5V Supply)
Bluetooth Module	HC-05 (TXD $\rightarrow$ Pin 10, RXD $\leftarrow$ Voltage Divider on Pin 11)
Limit Switch	Connected to Pin 2 (Triggering indicator LED logic)
Voltage Divider	$22,\text{k}\Omega$ + $10,\text{k}\Omega$ resistors on signal line for 3.3V logic translation
Power Supply	Dedicated external 5V power supply for the high-draw servo motor