Introduction: PetFret: Smart Pet Feeder
Hello, my name is Henri Van Oost and I am a student at Howest Kortrijk. I have made this IOT-project in my first year of Mulitimedia and Communication Technology.
I came up with the idea because I have a cat and a dog at home and it wanted to make feeding them way more easier (or lazy ;) ). So I've build PetFret: a smart pet feeder.
Below you can read all the necessary steps that I've had to go through in order to bring the project to a succesfull outcome.
Step 1: Components and Materials
For my project I used a lot of different components to be able to bring everything to a good end. The components
that I used are listed below. The total cost for this project was around €256.
- Raspberry Pi 4 model B
- Raspberry Pi power supply
- Raspberry Pi T-cobbler
- 16GB micro SD-card
- Temperature Sensor ~ DS18B20
- Non-Contact Watersensor ~ XKC-Y25-NPN
- 3 weight sensors ~ HX711
- 4.7K Resistor
- LCD 16x2
- Servo motor ~ MG996R
- Female to Female jumper wires
- Male to Male jumper wires
- Female to Male jumper wires
- 12V Supply
- PIR Sensor
- 2 food bowls
- Industrial wood saw
- Electric saw
- Electric screwdriver
- Soldering Iron Drill
In the pdf file below you can see the complete price list of all my materials.
Step 2: Database
After i figured out every component, I started to create a entity relationship diagram.
With my database you are able to see:
- The current value of the supplies and bowls
- The temperature of the water
- History of measurements
- List of sensors
- Opportunity for accounts
- Food details
I hosted my database on my RPI using MariaDB
Step 3: Fritzing Scheme
After everything was figured out, it was time to put my hardware together. I've made first a Fritzing Scheme so I could not do anything wrong which could cause a short circuit. For creating this scheme i used the program Fritzing.
Step 4: Assembling the Hardware
Once my fritzing scheme was finished and I was satisfied with it, I started putting my hardware together. I started with my temperature, PIR-sensor and non-contact watersensor. I did that because the sensors looked the easiest to me. The weight sensors were the last thing I did of the sensors because I had some troubles to program it.
After the sensors were done, I did my LCD.
The last step was to connect my actuators. The first actuator I connected was my servo. Once I succeeded I switched to the last actuator: my waterpump.
You can find my code on github: https://github.com/henrivanoost1/PetFret
Step 5: Mobile First Website
Step 6: Building the Case
Then it was time to make my enclosure. For my materials I went to Brico and bought wood an plexiglass. I made the outside of my box from wood that I cut by myself.I put plexiglass so you can easily see the supplies.