Description
This is a wireless controller that can be used with multiple devices and projects (eg my drone) using an ATmega644A.
During the development of my drone I needed a wireless controller. Instead of making a controller just for that project I decided to make a controller that can be used for other projects saving me time and allowing me to use an already tested controller for future projects.
The design allows for expansion in the future without rebuilding and flexibility for use in different situations.
Skills
- Electronics and designing circuits
- 3D modelling and printing
- Wireless communication
- Programming hardware
Closer Look
Inputs
The controller has a wide range of inputs, suitable for multiple projects
Circuit Diagram
This is the circuit which uses an ATmega644A, chosen due to the large number of pins needed, most of which are utilised
RGB LED
The LED colour gives an intuitive understanding of the status of the controller
| LED colour | Meaning |
|---|---|
| Red | Initialising or aborted |
| Orange | Waiting for other device |
| Blue | Standby mode |
| Green | Sending data |
Modular Expandability
The controller has a UART connector allowing for add-ons
Creating the Project
Prototype Circuit
This is the prototype board I made for the controller which uses an Arduino Nano:
Validation that the overall design worked.
- Limited inputs
- No expandability
- Limited feedback to the user
Prototype 3D Prints
I did a few prototype prints in order to get correct dimensions, strength and endurance.
Improvements for next print:
- Larger holes
- Thicker joystick stand
- Thicker base
Improvements for next print:
- Potentiometer higher up
- Slight adjustment of hole positions
Final Circuit
Utilising the knowledge from the prototypes (above) I re-designed the controller.
The fully soldered new board:
Note colour coded wires for aesthetics and easy identification
The fully functional controller:
Looking Forward
- I have used this reliably with my drone and it works without any problems
- Later I will add attachment points to support extensions and the code to support them
- I could add a grip which would improve ergonomics and allow triggers to be added