HalloWing M4 Animated Eye Candy Bowl

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2024-10-29 | By Adafruit Industries

License: See Original Project 3D Printing Displays LCD / TFT LEDs / Discrete / Modules

Guide by Ruiz Brothers

Overview

Animated Eye Upgrade

Upgrade this Haunted Candy Bowl with an Adafruit HalloWing M4! ‎Use the touch pads to change the side lit NeoPixel animations! ‎Customize the animated eyes and trick out your candy bowl to win ‎this year's Halloween!‎

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Magic Touch

Touch the pads on the HalloWing M4 to change the NeoPixel ‎animations. Featured animations include a beating heart, fading ‎gradients and rainbows!‎

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The Haunted Candy Bowl

This project uses the Animated Haunted Candy Bowl from Hyde and ‎Eek Boutique. It lights up, speaks phrases and features a mechanical ‎eye that moves side to side. ‎

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Eye Candy Bowl

For the retail price you get a pretty nice case that looks pretty cool ‎and has a decent quality – This beats hours of 3D printing. Plus, it's ‎already designed for a Cyclops! We just couldn't resist adding the ‎HalloWing M4 to this thing. The "eye" puns aren't too bad either.‎

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Project Goals

A few points we wanted to hit when making this project.‎

Fit the HalloWing M4 into the eye socket of the candy bowl ‎using a 3D printed mount.‎
Use the animated eyes and capacitive (cap) touch pads to ‎animate the HalloWing M4's side lit NeoPixel LEDs.‎
Use the existing slide switch to turn off/on the circuit.‎
Make the USB port accessible for reprogramming.‎

Setup HalloWing M4 with Animated ‎Eyes

Use the link below to launch the learn guide to get your HalloWing ‎M4 setup with the M4 eyes code. Setup is fast and easy, so once that ‎is done come back here and continue!‎

Set Up HalloWing M4‎

Parts

Here's a list of the parts used in this project:‎

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Software

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Configure The Eye

Once you have gone through the HalloWing M4 quick start guide, ‎you'll have the default "blue hazel" eye loaded and displaying. Feel ‎free to customize the settings or graphics! Reference the HalloWing ‎M4 learn guide to explore all the options.‎

Set Up HalloWing M4‎

Quick Start

Plug in your HalloWing M4 via a known good data+power USB ‎cable.‎
Double press the reset button and wait for the NeoPixels to ‎turn green.‎
The HALLOM4BOOT drive should show up on your computer. ‎
Download the UF2 file below and drop it onto the root of ‎the HALLOM4BOOT drive.‎

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EYES_TOUCH.UF2‎

Touch Input

Use the touch pads to change the NeoPixel animations. There are ‎four different programmed NeoPixel animations. Halloween color ‎gradients, beating heart, breath, and rainbow. These will loop and ‎repeat automatically. ‎

Building from Source

This project uses a build of the M4 eyes from the Adafruit Learning ‎System GitHub repository (repo). For advanced customization, use ‎the link below to open the section of the Learn guide that walks ‎through setting up Arduino and uploading the code.‎

Build from Source

Get the code working on the HalloWing M4 before installing into the ‎candy bowl.‎

Author Credits: Give shout out to Jonathan ‎Sampson and LadyAda for writing the code for this project.‎

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Tear Down

Candy Bowl

We'll remove the eye mechanism, two motors and the candy bowl. ‎Decide if you'd like to use the built-in sound effects. There's plenty of ‎space inside the base for other components such as more LEDs!‎

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Bottom Screws

Flip the bowl over and look on the bottom of the base. Notice there's ‎a removable door for accessing the battery. Find the four screws, one ‎on each corner.‎

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Remove Bottom

Use a screwdriver to remove the four screws. The battery door is ‎secured with a single machine screw. The slide switch features two ‎modes with the "off" state being the middle. Save the four bottom ‎screws. Locate the small gap and use a tool with a thin and flat tip to ‎pry open the bottom plate. Separate the bottom panel from the base ‎by pushing out on the edges. ‎

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Gut The Inside

With the bottom panel removed, start gutting out the motors by ‎removing screws. If you like to remove the internal LEDs, you can ‎use flush cutters to remove hot glue and pull out the LED bulbs.‎

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Removing Bowl

The white candy bowl is secured to the base with three machine ‎screws. Use a screwdriver to unfasten and remove them. Save the ‎candy bowl and screws for later. We'll reinstall them after the ‎HalloWing M4 has been installed.‎

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Removing Eye Mech

The eye mechanism is secured with two machine screws. The eye ‎mechanism uses a piece of string to pull the eye lids back. Untie the ‎string and remove any of the mounting bits and screws.‎

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Eyes and Motors

The HalloWing M4 doesn't quite fit inside the eye mechanism, so we ‎won't not be using it in this project. We can save these components ‎for future projects!‎

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Gutted Base

With all of the components, mounting bits and hardware screws ‎removed, base is now ready for installing the HalloWing M4. ‎

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Bottom Components

The bottom base plate has a circuit board, IR sensor, speaker, slide ‎switch and battery holder. There was also a 2-pin JST connector for ‎the "try me" button switch. I swapped out the existing wiring for ‎silicone-cover stranded wires, just for organizational purposes (totally ‎optional). The slide switch is the only component we'll be using with ‎the HalloWing M4. This allows a convenient way to turn off/on the ‎HalloWing M4.‎

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Paper Template

Don't have access to a 3D printer? No problem! Print out a paper ‎template and use it to make your own PCB mount out of foam core, ‎cardboard or a sheet of plastic, dealers choice!‎

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PDF Vector Artwork

Download the PDF and print it out on paper. This was designed to fit ‎on an 8.5in x 11in sheet of paper. The dimensions of the mount are ‎noted for checking if the scaling is correct after the print.‎

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pcb-mount-template.pdf

Foam Core Board

For this project we cut the shape out of foam core board. I suggest ‎adhering the paper template over the work piece first (glue stick). ‎Insert the tip of the blade to make several incisions and follow the ‎outline. Cutting curves can be tricky so take your time! A rotary tool ‎with a drill bit can be used to create the mounting holes.‎

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Take caution and be careful when using knifes and operating power ‎tools! For best safety, young makers ought to have adult supervision.‎

PCB Mount Screws

Use the following hardware for mounting the HalloWing M4 to the ‎mount. Insert the nylon screw through one of the mounting holes ‎through the top. Hold in place and install standoff by fastening onto ‎screw thread.‎

4 x M2.5 x 8mm female to female standoffs‎
‎4x M2.5 x 4mm screws‎

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Test Fitting

Follow the tear down section before test fitting the cut piece into the ‎base of the candy bowl. It should have a snug fit when press fitting it ‎through the eye hole. ‎

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Cut Pieces

I made several cut pieces before getting the right shape and fitting. ‎Like stated above, cutting curves can be rather tricky! A few ‎attempts make for good practice. For this small part, cutting pieces ‎by hand beats dealing with 3D printers or laser cutters.‎

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Lens Holder

The lens holder requires a bit more precision to fit the lens. If you ‎don't have a 3D printer, you can purchase the acrylic lens holder ‎from the shop. Longer screws may be needed to pass through acrylic, ‎PCB, and standoffs.‎

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Clear Acrylic Lens Holder + Hardware Kit for HalloWing

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‎3D Printing‎

‎3D Parts‎

STL files for 3D printing are oriented to print "as-is" on FDM style ‎machines. Original design source may be downloaded using the ‎links below.‎

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Slicing Parts

The bowl has a 1.5mm thick shell and it can be printed without any ‎support material.‎

PLA filament 220c extruder
‎0.2-layer height
‎10% gyroid infill‎
‎60mm/s print speed‎
‎60c heated bed‎

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F360 – PCB Mount

F360 – Lens Holder

Download CAD Files on Thingiverse

PCB Mount

The PCB mount features four mounting holes that are 3.5mm(0.14in) ‎in diameter. The center hole has a diameter of 18mm (0.7in).

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Design Source Files

The project assembly was designed in Fusion 360. This can be ‎downloaded in different formats like STEP, SAT, and more. Electronic ‎components like Adafruit's board, displays, connectors and more can ‎be downloaded from our Adafruit CAD parts GitHub Repo.‎

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Lens Holder

You'll need the following hardware to install the lens holder. These ‎are sourced from the M2.5 nylon standoff kit.‎

‎4x M2.5 x 8mm female to female standoffs‎
‎4x M2.5 x 4mm screws‎

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Install Standoffs

Insert the M2.5 screw into one of the mounting tabs. While holding in ‎place, fasten a standoff onto the thread of the screw.‎

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Lens Holder

We'll need 2x M2.5 x 4mm screws to secure the lens holder to the ‎PCB. Notice the orientation of the mounting tabs and the mounting ‎holes on the HalloWing M4.‎

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Installing Lens Holder

Place the plastic lens over the display. Lay the lens holder over the ‎lens with the standoffs facing down. Line up the standoffs with the ‎mounting holes on the HalloWing M4 PCB.‎

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Installed Screws

Notice we only have two screws installed. If screws are installed in ‎the bottom holes, the PCB won't sit flush with the mount. Two ‎screws are sufficient for keeping the lens secured in place.‎

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Installed Lens Holder

Fasten the screws tightly.‎

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Flush Lens

‎8mm tall standoffs have just the right height for the lens holder. ‎

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PCB Mount

PCB Mount Screws

The PCB mount needs the following hardware for installing.‎

‎4 x M2.5 x 8mm female to female standoffs‎
‎4x M2.5 x 4mm screws‎

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Installing Standoffs

Insert the nylon screw through one of the mounting holes through ‎the top. Hold in place and install standoff by fastening onto screw ‎thread.‎

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Installed Standoffs

Tightly fasten the remaining screws and standoffs.‎

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PCB Mount

The hole in the center of the mount can be used for passing wires and cabling through to connect to the HalloWing M4.‎

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Install HalloWing

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Install PCB Mount

Press fit the mount through the eye socket from the inside of the ‎base.‎

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Installed Mount

The 3D printed PCB mount features a tapered flange that prevents it ‎from falling out. Optionally hot glue it in place for extra security.‎

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Install Battery for HalloWing M4‎

Find an empty spot on the bottom base for the battery. I used ‎mounting putty to secure the battery. Other options are hot glue and ‎double-sided foam tape. Plug in the 2-pin JST extension cable.‎

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On/Off Switch Wires

If you'd like to use the existing switch, you can wire it up to ‎the EN (enable) and GND (ground) pins on the back of the ‎HalloWing M4 socket headers. Use right-angled male header pins ‎for a low-profile fit. The length of wire is about 8 inches.

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Slide Switch Wiring

The built-in slide switch features two sets of pins. Use the available ‎pins to connect the EN and GND pins on the HalloWing M4. Using ‎the middle pin and the one next. The middle position of the switch is ‎the OFF state. The LIGHT state will turn the HalloWing M4 ON. ‎

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Thread Wires

Pass the battery and switch cables through the center hole of the ‎PCB mount. Pull out a good amount of slack for better handling of ‎the wires.‎

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Connect Switch Wire

Insert the two header pins from the slide switch to ‎the EN and GND pins on the back header sockets of the HalloWing ‎M4.‎

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Connect Battery Wire

Plug in the JST extension cable to the battery port on the back of the ‎HalloWing M4. You may need to remove the screw; it slightly blocks ‎access to the battery JST port.‎

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TURN ON the built-in slide switch on the back of the HalloWing M4. ‎It must be on the ON position in order for the circuit to work.‎

Installing HalloWing M4‎

Place the HalloWing M4 PCB over the four standoffs on the PCB ‎mount. Line up the mounting holes with the standoffs.‎

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Secure HalloWing M4‎

Use two M2.5 x 4mm screws to secure the HalloWing M4 PCB to the ‎standoffs.‎

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Accessible USB Port

The micro-USB port is accessible for recharging the battery and ‎reprogramming the HalloWing M4. ‎

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Reinstall Candy Bowl

Use the three existing screws to reinstall the candy bowl back onto ‎the base.‎

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Reinstall Bottom Panel

Fit the bottom panel back onto the base. Make sure to orient the ‎bottom so the IR sensor is lined up with the small hole in base. Insert ‎and fasten the four existing screws to secure the bottom panel to the ‎base.‎

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On/Off Slide Switch

The LIGHT position will turn the HalloWing M4 on. The middle ‎position will turn off the HalloWing M4.‎

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Touch Test

Touch the four pads on the HalloWing M4 to change the NeoPixel ‎animations. Don't forget to reinstall the candy bowl! ‎

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Final Assembly

And there you have it! A creep tricked out haunted candy bowl with ‎sweet RGB LEDs and animated eye!

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Going Beyond

There's lots of opportunity to go beyond the scope of this project. The ‎stock candy bowl features a built-in speaker and IR sensor. These ‎could be wired into the headers on the back of the HalloWing M4. If ‎you have experience programming, check out the M4 eyes code on ‎GitHub. There's also plenty of room inside the base for extra goodies ‎such as NeoPixel LED strips.‎

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