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Lab 08 - Believer Comms and Firmware

Overview

During this lab we tested the believers comms and telemetry systems

Resources

Hardware and Software

AIDA3 PC
USB Serial Cable
Personal PC (Windows)

Readings

Hardware and Software

AIDA3 PC
USB Serial Cable
Personal PC (Windows)

Readings

Activity 1: Set up RFD900x

General Info about telemetry module used

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

The following are the settings that we used for RFD tools
a. The ground unit was connected to the RFDTools PC. b. The air unit was connected to another PC. We are group 5 so the purpose of our settings is shown in the table below. The serial speed of all of the groups was constant, however, the NETID was different to avoid interference.
RFD900 Settings 2
Group Number
Setting Name
Default
Set Value
Purpose
1
2
SERIAL_SPEED
57
115
Open
NETID
25
25
Open
2
2
SERIAL_SPEED
57
115
Open
NETID
25
50
Open
3
2
SERIAL_SPEED
57
115
Open
NETID
25
75
Open
4
2
SERIAL_SPEED
57
115
Open
NETID
25
100
Open
5
2
SERIAL_SPEED
57
115
Open
NETID
25
125
Open
6
2
SERIAL_SPEED
57
115
Open
NETID
25
150
Open

Testing Communication

We sent the message hello world! as a test for the telemetry systems. With our ground and air unit set up, we were able to communicate point-to-point between both modems. This was done by using PuTTY. We were successfully able to communicate between both of the computers. Here is a sceenshot of our communication. Both computers could type on this screen and they could see what the other was typing. The Steps we used to set this up was as follows:
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

General Information about firmware

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

We used the instructions in the to install firmware. Below is a picture of the installed firmware
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

Then we tested the connection with the Windracers Ground Control app. We used the following instructions to do this
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



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