{"data":{"model":{"id":"1251212","slug":"moai-pet-feeder","name":"MOAI Pet Feeder","authorship":"remix","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"0","myRating":null,"ratingCount":0,"description":"

This project is about feeding my pet treats. Sometimes my pet does something right, and I want to reward him. So I take my cell phone out of my pocket and give him a treat for doing something right.

Required equipment

HARDWARE

Wemos D1 Mini ESP8266 WiFi Board (Usb-c model)
28BYJ-48 Stepper Motor
ULN2003x Stepper Motor Driver-(motor)
6 Jumper Wires F-F
3D Printed parts
- top of the head
- the head
- the bottom of the head
- the spiral
USB-C cable
neodymium magnets 6mm diameter and 3mm grosor
2 screws M3x10
Philips screwdriver

SOFTWARE

Arduino IDE
App inventor (online)
Arduino code for the Wemos (on this project)
The App Inventor program file (on this project)
A smartphone or tablet
Tinkercad

Project time schedule

Time spend in each part:

3D Printing models (12h)
Collecting the parts (20min)
Assembling (1h)
Programming (1h)

Workflow

\ud83d\udee0 What You\u2019ll Need (Hardware)

Wemos D1 mini (ESP8266-based microcontroller)

USB cable (for programming the board)

Dupont cables

3D printed MOAI structure (or equivalent)

Power supply

Smartphone or tablet

\ud83d\udee0 What You\u2019ll Need (Software)

Arduino IDE (installed on your PC)

MIT App Inventor (could use the online version)

\u2705 Step 1: Hardware Assembly

Connect the Dupont cables according to the wiring diagram showing in the image below.

Thats all! Simple and easy.

Before opening the Arduino IDE to program the board, make sure you have installed the CH340 drivers (https://www.wch.cn/downloads/CH341SER_EXE.html) so you can program the Wemos board.

Once downloaded, execute it and press the Install button.

Now connect the WeMos D1 mini to your computer using a USB cable.

\ud83d\udcbb Step 2: Preparing the Arduino IDE

Now let's add the Wemos boards to the Arduino ID. Open the Arduino IDE.

Go to File > Preferences.

In the \"Additional Board Manager URLs\", click the icon on the right and paste this URL:

http://arduino.esp8266.com/stable/package_esp8266com_index.json

Click OK, then again OK.

Open the Tools -> Board -> Board Manager menu. In the top search box, next to \"Type,\" enter \"ESP8266.\" In the middle of the box, \"by ESP8266 Community version x.xx\" will appear. Find the \"Install\" button in that box and click it. Wait for the installation. Once installed, close the boards window.

2.3 Install ESP8266 Board Package

Go to Tools > Board > Boards Manager.

Search for ESP8266.

Install the package labeled \"by ESP8266 Community\".

2.4 Select the Correct Board

Go to Tools > Board > ESP8266 Boards and choose: \u201cLOLIN (Wemos) D1 R2 & mini\u201d

\ud83e\udde0 Step 3: Upload the Code

Open a new Arduino sketch and delete all existing code.

Paste the Arduino code for the MOAI project into the window.

We need to change a little bit the Arduino code. We need to add your wifi credentials, so the board can connect to the internet.

Locate the following two lines and replace them with your Wi-Fi credentials:

const char* ssid = \"YOUR_WIFI_NAME\";
const char* password = \"YOUR_WIFI_PASSWORD\";

Click the Verify/Compile button (\u2713) or go to Sketch > Verify/Compile.

If it compiles correctly, you'll see the message \u201cCompiled\u201d.

\ud83d\udd0c Step 4: Upload Code to Wemos D1 mini

Make sure the Wemos is still connected via USB.

Check the correct board is selected: Tools > Board = Wemos D1 mini

Check the correct COM port is selected: Tools > Port = COM port that appears when Wemos is connected.

Tip: unplug and replug the USB to identify the right COM port.

Click Upload (\u2192) or go to Sketch > Upload.

Wait for the upload to complete. You'll see \u201cUploaded\u201d at the bottom of the IDE.

\ud83d\udcf1 Step 5: Install the Mobile App

Go to MIT App Inventor and create a free account.

In the dashboard, go to Projects > Import project (.aia) from my computer.

Upload the provided .aia file in this project.

Open the project.

5.1 Install the App on Your Smartphone/Tablet

Go to Build > Android App (APK).

After compiling, a QR code will appear.

Scan it with your phone to download the app.

If you receive a warning like \u201cThis file may be harmful\u201d, choose Download anyway.

Open the downloaded file and install the app.

Android may prompt a security scan \u2014 you can accept and proceed.

Step 6: How to Use the MOAI

Before using: make sure both the MOAI and the smartphone/tablet are connected to the same Wi-Fi network \u2014 the one you entered in the Arduino code.

Connect the MOAI device to a power source (use the same computer with Arduino IDE for the first time).

Open Arduino IDE.

Select the correct COM port again (Tools > Port).

Open the Serial Monitor to read the output \u2014 the device\u2019s IP address will appear.

On your smartphone or tablet, open the MOAI app.

Enter the IP address into the app when prompted.

That\u2019s it! The app is now connected to the MOAI.

\ud83c\udfae Interacting with the App

Tap the center button or image in the app.

The app sends a signal to the Wemos, triggering the feeding mechanism (or lighting up the LED if you're testing).

Authors

Fab Lab Le\u00f3n student Julio and his Instructor Pablo.

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The main changes with the original project was:
- The 3d printed object is totally different, designed by our student Javier
- We have changed the image in the app from the original
- The electronic is simpliest than the original
- We document all the proceses to get this project working.

","easyprintProjects":[],"__typename":"PrintType","eligibleForNomination":true,"publishApprovalRequired":false,"publishRequests":[],"priceBeforeSale":null,"user":{"id":"26493","handle":"FabLabLeon","verified":false,"dateVerified":null,"publicUsername":"Fab Lab Le\u00f3n","avatarFilePath":"media/auth/avatars/5c/5ce24006-024d-40eb-8b17-532646a77353.jpg","badgesProfileLevel":{"profileLevel":21,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isFollowedByMe":false,"isHiddenForMe":false,"canBeFollowed":true,"billingAccountType":"personal","lowestTierPrice":null,"designer":false,"stripeAccountActive":null,"membership":null},"contests":[{"id":"468","name":"Smart Pet Gadgets with Arduino","slug":"smart-pet-gadgets-with-arduino","description":"

\r\n
\r\n
\r\n

The contest runs from February 27 to April 27, 2025

\r\n
\r\n
\r\n\r\n

Challenge

\r\nEver looked at your pet and thought, \"You deserve something awesome\"? Well, now\u2019s your chance to fix that! Design a tech-powered gadget for your furry (or non-furry) friend using Arduino and 3D printing. Think automated playmates, high-tech trackers, smart aquariums, or remote-controlled feeders. Whether it\u2019s a self-fetching ball launcher, a next-level scratching post, or a fish tank that runs itself\u2014you know what your pet needs.\r\n
\r\n
\r\nNever used Arduino before? No worries! Arduino is a small, programmable board that can control lights, motors, or sensors, and it\u2019s the perfect way to add some tech magic to your project.\r\n
\r\n
\r\n

Project Template

\r\nGrab our template and see all the info we\u2019d love to see in your submission:\r\nPrintable_Arduino_Project_Template.pdf\r\n
\r\n
\r\n

Inspiration

\r\nCheck out the official Arduino Printables account for more ideas:\r\n
\r\nArduino on Printables\r\n
\r\n
\r\n

All the Specs

\r\nNeed datasheets or documentation for the Arduino products you\u2019ll be working with? We\u2019ve got you covered:\r\n
\r\nArduino Documentation\r\n
\r\n
\r\n

Exclusive Discount for Contest Participants

\r\n

We\u2019ve got a little bonus to help bring your ideas to life! \r\n
\r\n
\r\nUse the code PRINTABLES25 to get 15% off Arduino Boards & Modules.

\r\n\r\n

Valid from Feb 27 to Apr 27, 2025
One use per customer
Shop here: Arduino Boards & Modules

\r\n
\r\n

What makes a valid entry?

\r\nYour project must use both Arduino and 3D printing, and it should include a clear description, photos, and all necessary files described in the Project Template.\r\n\r\nPlease avoid dangerous designs - keep it safe and fun!\r\n

\r\n\r\n","isOpen":false,"__typename":"CompetitionType"}],"contestsResults":[],"prusameterPoints":null,"latestContestResult":null,"referencingArticles":[]}}}

MOAI Pet Feeder

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