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Lab 08 - Believer Comms and Firmware

20 Points
Last edited 22 days ago by Ryan Andrew Shurtleff.

Overview

Resources

Hardware and Software

AIDA3 PC
USB Serial Cable
Personal PC (Windows)

Readings

Activity 1: Set up RFD900x

Specification Questions

Answer the following questions about the specifications on the telemetry module.
What frequency are these set to? Why?
902-915MHz and 915-928MHz. For interference mitigation.
Why do the antennas need to be connected before powering?
Without the antennas connected, the power would have nowhere to go would fry the telemetry receiver.
What is special about the USB Serial plug?
It has a 6 pin connector on one end.
What is pin one on the RFD900 USB Serial Connector, and what color wire connects to it? Please attach a photo before plugging it into your computer's USB
Pin one is the farthest left most pin on the connector, black.
Image (67).jpg
What is BAUD?
How fast data is transferred per second

Settings

Adjust the modem’s settings for your group.
Download and install RFDTools on one computer.
Connect both RFD900 units
The ground unit connects to the RFDTools PC.
The air unit connects to another PC.
Connect and modify the settings in
Fill out the Purpose Column to explain what the setting changes (review the manual).
Print a label for both the ground and air unit with your group name (AIR-1; GROUND-1)
RFD900 Settings
Group Number
Setting Name
Default
Set Value
Purpose
5
2
SERIAL_SPEED
57
115
Open
NETID
25
125
Open

Testing Communication

Send hello world! to your neighbor. With your ground and air unit set correctly, you can now communicate point-to-point between both modems. You will need two computers - follow the steps below for both.
Open PuTTY.
Connect one modem per computer.
Open Device Manager from the start menu.
OR: Hold the Windows Key + R > type devmgmt.msc > hit enter
Expand the Ports (COM & LPT) heading
Look for “USB Serial Port (COM3 / 16)” and record this number ​
image.png
In PuTTY enter the following:
COM# > Serial line
Speed > 115200
Hit Open ​
image.png
You should now be able to type between computers and visualize the display. Send a “hello world" message between the computers and attach a screenshot.
image.png

Activity 2: Installing Firmware

Specification Questions

The file provided by Windracers has a .apj file extension. What does this mean and why?
Its a specific file type that is used to load firmware onto flight controllers.
What is Mission Planner? What are the alternatives to Mission Planner? Mission Planner is a free ground control software that we will be
Do you expect the Windracers flight controller firmware to work with Mission Planner?
Yes.
How much memory does the Blue Cube have? 2MB

Installing Firmware

You will be provided with the precompiled firmware on a flash drive. All work on the flight controller must be completed on an AIDA3 PC.
If not already installed, download and install Mission Planner
You will need an admin account - ask your instructor
Open Mission Planner and follow the for custom firmware.
Attach a screenshot of the completed firmware installation.
Image (69).jpg

Testing

Now we will test the connection with the Windracers Ground Control app.
On an AIDA3 PC, open Ground Control.
Be sure that the flight controller is connected via USB.
Navigate to Settings and click on Connection ​
Screenshot 2025-10-28 132652.png
Create a new connection with the following settings
Type: Serial
COM Port: COM# (refer to step )
Baud Rate: 115200 ​
Screenshot 2025-10-28 132716.png
The aircraft should automatically connect and be visible in the Flight Plan menu.
Attach a screenshot.
Image (68).jpg

Deliverables

Work with your groups to complete this lab.
Develop your own e-portfolio post using the inline questions to guide your development of a lab report.

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