WORK ACCOMPLISHED:
This week I worked on the wristband subsystem and creating the piece that will attach our device to the GoPro bike mount
A lot has changed in the last two weeks. In between the first and second interim demo I made a pivot from ultrasonic sensors because they started having connection issues with our raspberry pi. I switched to the OPS243 Doppler Radar Sensor that was in the ECE inventory and was able to write a script to parse it’s data, and trigger a vibration on the wristband circuit whenever an object is detected at a particular speed and distance from sensor. This sensor solves the issue of detecting stationary objects because it measures speed relative to itself.
Additionally, I spent time 3d printing the bike mount piece that will connect the navigation device of our system to the GoPro bike mount. It took a few iterations to get the right sizing to fit the mount and may need improvements once we get the main device encasing created. Lastly, I worked with Forever to change our bluetooth system from operating with 2 HC-05 modules to using the RPi4 bluetooth and one HC-05 module because we were having trouble sending data with the previous setup.
TESTING VERIFICATION:
I tested the basic functionalities of OPS243 and it work wells in doors when stationary. It does have a more limited field of view than the ultrasonic sensors but it’s better at filtering out unnecessary objects if I set the right configurations. Our encasing for our device has not been created yet so I can’t test on a bike yet.
The wristband system is able to meet our use case in a limited setting. When the system was stationary, a vibration haptic feedback response is generated within a second of an incoming object being detected. Unfortunately, the coverage area for the blind spot is minimal with the OPS243 sitting around 20 degrees laterally but for MVP we’re hoping this will suffice. I have yet to test the accuracy rate of the blindspot system but aim to do so next week.
PROGRESS:
I’m on pace with my tasks right now. We were able to get all our subsystems running simultaneously, but need to push and test with all parts running while on a bike.
NEXT WEEK’S DELIVERABLES:
Next week, I aim to have an wristband design 3d printed and have the vibration system fit properly in it. I will also run non-stationary tests with the OPS sensors.
