the Remote Control

This exploded view was designed to assist you in the assembly of the NovaSM3 Remove. So try it out and have a whirl around her body and get a feel for what is involved and where the parts go. The power of this view comes from the features that are offered. Check out a few key ones listed below that will be very helpful when modifying, assembling, and understanding the Nova Spot Micro Remote.

Courtesy of Jordan Letchford

  • Select a Part and then right-click on it will for additional options (useful for hiding parts)
  • Markup – Can annotate the current frame with all types of handy images and words to help get an idea across
  • Section Analysis – cut the Nova Remote down an axis and explore the inner works of it
  • Exploded Model – Explode the Nova Remote into all of its parts, right down to the bolts and nuts
  • Model Browser – find your desired part, click it and see exactly where it fits into the Nova Remote and in what orientation. Each part will have a drop-down list for its subparts and there is a search box at the top of the list, utilize that for a smooth experience. Once you are done, press ESC on the keyboard, and you are back to the start. 
  • Environment Change – Go to settings -> Environment. You can now change the color of the background and make the model pop in new ways. This can be useful before printing it or to just see highlights easier. 
  • Want the CAD models as a STEP – just click the link to the cad assembly files and you can download the files in an arrangement of file types from the top left of the screen. 

Direct Link to 3D Assembly Model

Hello Lovely People,

This remote control was designed and built by me for my NovaSM3 quadruped robot dog project. It could easily be used with any remote controlled device using a NRF module and some custom coding! 😉

I will do my best to walk you through how to build one of your own with text, images, and videos! For help, support, questions, and updates, join Nova’s website and visit the other links below:

NovaSM3 Project: https://novaspotmicro.com

GitHub Project: https://github.com/cguweb-com/Arduino-Projects/tr…

Discord Server: https://discord.gg/Fj8NsHED

YouTube Playlist:


Supplies

Direct links to the parts required for this project can be found here:

https://novaspotmicro.com/files-parts-remote-contr…

What you will need:

  • Arduino Mega 2560 Pro Embed
  • Lipo Battery
  • 2 OLED Displays
  • 2 Thumb Joystick Breakouts
  • Mini Momentary Push Buttons
  • NRF24101 Module
  • SPDT Rocker Switch
  • Sliding Potentiometers
  • Round Momentary Push Buttons
  • WS2812B 5050 Smart RGB LEDs
  • 5V Buck Converter
  • 3.3V Voltage Regulator
  • Solid Hook Up Wire
  • Resistors
  • 22uF apacitor
  • 3mm Hex Cap Screws
  • 3D printing filament of your choice

Step 1: 3D Printing

STL Files:

There are only 3 parts to print for this project, so use high settings for your printer and get the best quality and strength you can out of them.

  • Front Cover
  • Back Cover
  • Holding Block

Download the latest STL files from GitHub:

https://github.com/cguweb-com/Arduino-Projects/tree/main/Nova-SM3/Remote%20Control/STL%20Files

All parts require support while printing, and the best orientation would be with the outside / finished surfaces facing up. The infill should be about 12-16% and I suggest using something simple like line fill pattern for easiest and cleanest removal from the parts cavity of the remote.


Step 2: Electronics Components

This is the most confined-space project I’ve ever designed, and needless to say it was quite tricky to get everything inside this remote! So be patient, especially when it comes time for wiring!

You’ll notice that the front cover has indents for most of its components to sit in. Some press in nicely, like the slide potentiometers, some may require a dab of glue, or in my case, I used some open-cell foam padding between my holding plate and the OLEDs and RGBs. I used no glue for anything in my version.

Be sure to test fit all components in their places before beginning to wire things. Plan your wiring carefully. In the next section I will share my methods and process for wiring, but in most cases, you are free to route wires and power as you see fit.



Step 3: Wiring Schematic



Step 4: Overall Wiring & Assembly

Before diving into the wiring, please watch this video I did on an overall wiring plan for the project:


Step 5: Pre-Assemble Where Possible!

In my case, I pre-wired the back cover “fire” buttons, the NRF and power regulators, the Mega pin pad wires, and the OLED screens in preparation for making the wiring as painless as possible. Its a wise idea to try and do this where ever possible. 😉


Step 6: Power Train

The remote uses a 2 cell 7.4v Lipo battery.

Please watch this video on battery use and safety that I created specifically for how we are wiring this battery for this project:

The double-throw power switch is wired to the battery in such a way that allows us to switch the battery between powering the remote and charging mode.

In power mode, the battery power runs first through a voltage divider to monitor the battery’s charge, as well as into the 5v buck converter to power the Arduino Mega with a constant 5+ volts. The Mega then provides power to the OLEDs and RGBs.

There is also a simple two-resistor voltage divider circuit used to monitor the battery level. This circuit was added after the build videos and photos were created, so it does not (yet) appear in any. However, the wiring schematic shows how it should be wired, and being its just two resistors, it can go in a few different places within the back cover.


Step 7: NRF24 Module Power

Also from the 5v buck converter, the power is pushed through a 3.3v regulator, which provides direct 3.3v to the NRF24 module exclusively for best performance of the device.

And finally, we add a 22uF capacitor across the Ground and VIN pins of the NRF to also help with an important constant and clean voltage supply.


Step 8: Main Components & Wiring

The front cover houses the majority of components for this project. Each has its place, so it really cannot be assembled incorrectly. Just be certain that your Joystick modules and Slide Potentiometers are orientated in the same direction.

WARNING: This wiring project is not for the faint at heart! Because of space limitations within the remote, please follow these conventions to insure a compact assembly:

  • wires must be soldered directly to most components without using pin headers
  • wires should be as short as possible
  • solid-core wire is suggested for most connections, allowing you to use the wire’s memory in routing and positioning of the wires after assembly
  • JST connectors (or other) should be used for the NRF-to-Mega wiring, the 2 “fire” buttons installed in the back cover, and the 5v Power Supply to the Mega.

Step 9: The Holding Plate

The Holding Plate is where the Mega gets secured using two threaded inserts and screws, along with a small piece of perf board to be used as the common power distribution terminal where all 5v and Ground connections will converge.

The Holding Plate snaps into place with perfect alignment to the components underneath it, providing a mechanism of locking them in their places without the need for glue or fasteners.


Step 10: Final Wiring Connections

This is the most tricky part of the process, be patient!

Carefully make all of the final connections that you could not preassemble or solder until fully assembling the components and holding plate.

Reminder: keep these wires short as possible, and use solid-core wire for most connections.

And finally, once you have triple checked that you have made all of the wiring connections, shrink-wrapped any exposed wires or leads, and neatly moved all wires to safe and compact locations as best as possible, you are ready to connect your JST connectors and close the two halves together!!

Congratulations, you did it!


Step 11: Software Installation

If you are building the NovaSM3 Project, the Remote software is still under development, so join and stay tuned for its release!

In the interim, here is the code that tests all component functionality locally by using the OLEDs & RGBs.

GitHub:

https://github.com/cguweb-com/Arduino-Projects/tree/main/Nova-SM3/Remote%20Control/Code

And of course, for your own projects, you are welcome to roll your own code!