Amazon Alexa Powered Automatic Fish Feeder

Step 1: Things You Need

• 1 X Servo Motor

• 1 X Raspberry Pi 3 (any Raspberry Pi with internet would work)

• 1 X Raspberry Pi Adapter

• 1 X MicroSD Card with Rasbian OS

• 3 X Jumper Wires Male to Female

• 1 X Cardboard

• 1 X Scissors

• 1 X Marker/Pen

• 1 X Scale/Ruler

• 1 X Tape Role

• 1 X Echo Dot (optional)

Step 2: Make the Container

• Mark these dimensions on cardboard (you can make it as big/small as you want)

Use a marker/pen along with a ruler and make exact three shapes like these.

• Now cut these pieces using a scissor

Please note that A (the inner line) depends upon the amount food you feed to fish.

• Now fold along the inner lines

Fold each piece along the inner lines facing upwards as shown in the picture.

• Now Tape them together like a pyramid

Tape them together such that they form a pyramid-like structure, as shown in the picture.

• Now make a cap

Now make the cap for the smaller mouth of the pyramid, this needs to a little bit big so that it does not leak.

• Stick the cap on the servo motor dial

Paste the cap on the servo motor dial using some tape/glue

• Tape the servo motor on the container

Finally, tape the servo motor on the container, make sure it closes the mouth properly.

Step 3: Create Firebase Database

• Open firebase.

• Click on Go to Console.

• Click on Add Project.

• Name your Project.

• Click on Create Project.

• Click on Database.

• Select Start in Test Mode.

• Note down your firebase id.

Step 4: Create Alexa Skill

• Visit developer.amazon.com.

• Log in with your amazon credentials.

• Click on Developer Console.

• Click on Create Skill.

• Name the Skill.

• Click on Select (Custom Skill) and then Create Skill.

• Click on Invocation Tab and fill invocation name as fish feeder.

• Click on JSON Editor Tab and Paste the code below.

{"interactionModel": {"languageModel": {"invocationName": "fish feeder","intents": [{"name": "AMAZON.FallbackIntent","samples": []},{"name": "AMAZON.CancelIntent","samples": []},{"name": "AMAZON.HelpIntent","samples": []},{"name": "AMAZON.StopIntent","samples": []},{"name": "FeedNow","slots": [],"samples": ["feed the fish","feed fish","feed my fish right now","feed my fish please","please feed the fish","fish my feed now"]}],"types": []}}}

• Click on Build Model.

• Click on Endpoint Tab.

• Copy your Skill Id.

• Visit aws.amazon.com. (in new tab)

• Click on Sign in to console.

• Click on Lambda (search, if not on front page).

• Click on Create Function.

• Fill the details (check out the pic).

• Click on Create Function.

• Click on Alexa Skill Kit.

• Click on Enable and paste your skill id.

• Click on Add.

• Click Save.

• Now Click on your skill name (check out the pic).

• Scroll Down and Select Upload a.Zip file.

• Download the Github repo from here.

• Unzip the repo.

• Navigate into the folder called Alexa/Lambda.

• Open the file named as lambda_function.py in any text editor.

• Now paste the firebase id into the line 3 (replace {your firebase url} with your firebase id)

• Now move this file to the lambda-zipped.zip archive. (if using WinRAR just drag and drop it to the archive)

• Now upload this lambda-zipped.zip to aws.

• Copy your ARN (see the pic)

• Now go back to developer.amazon.com.

• Paste the ARN and click on Save Endpoints.

• Click on Test Tab.

• Toggle the Switch.

• Type the command - start fish feeder

• if reply received you are good to go.

Step 5: Setting Up the Raspberry Pi 3

• Connect your Servo Motor to the following pins.

• Middle Most (RED) -> VCC (PIN 02)

• Dull Color (BROWN) -> GROUND (PIN 06)

• Bright Color (ORANGE) -> PIN03

• Log in to your Pi (Using SSH or using Monitor/Keyboard/Mouse)

• Open Terminal and run the following commands -

• cd Desktop

• git clonehttps://github.com/madhurgupta10/Automatic-Fish-F...

• Now open the folder Automatic-Fish-Feeder

• Navigate to folder Pi

• Open app.py in a text editor.

• Replace line 5 with your firebase url.

• Save it.

• Now open Terminal and run the following commands -

• cd Desktop

• cd Automatic-Fish-Feeder

• cd Pi

• python3 app.py

• Now use your Alexa device or app and say - Alexa, start fish feeder

• If everything works you are good to go.

• Note that in app.py you can edit the arguments of FeedNow function in line 11, the first argument is delay and second argument is the angle.