Having a pet is a lot of fun. But whenever you want to go on a fun vacation and you cant bring your best friend with you, you need to find a person to come and feed your pet. I've had this issue a lot and got the idea to build my own automatic pet feeder you can control from a website.

Supplies

Raspberry Pi 4
2 Breadboards
Mini Breadboard
Breadboard power supply module
DHT11 sensor
TMP36 sensor
LDR
MCP3008
PCF8574
Jumper wires
16x2 LCD module
Laser module
Stepper motor
Stepper motor driver board
Resistor set
Wood
Custom made rotor

Step 1: Step 1: Fritzing Schema

To read in my LDR and TMP sensor i used a PCF. To use this you'll need to enable I2C on your raspberry PI. For the DHT11 I decided to use a library because programming it yourself is a big mess. I recommend using the Adafruit DHT library for this.

Step 2: Step 2: Creating a Database

Above you can see my database model. My database was hosted on my Raspberry pi using MariaDB. The 4 tables i used did the following

tblSensoren was used to store the different sensors i used
tblWaarde was used to store all the values i read from my sensors
tblActuatoren was used to store the state of my Laser module and stepper motor
tblVoedermomenten was used to store all the datetimes when my motor had to turn on

Step 3: Step3 : Connecting the Electronics and Coding

I combined all the electronics like shown in the firtzing schema above. I pinned all of it on my breadboards. When all of this is connected you can download my code on github to try if it works.

Step 4: Step 4: Building the Case

I decided to build the case out of leftover planks of wood i had laying around. After sawing all the planks of wood into the correct shapes I nailed and screwed all of them together.