Pfthb

So, I found a project on Reddit that uses a raspberry pi and hat + mqtt server to show locations on an led matrix. Link to project here. Link to source code can be found on the same page. Long story short, the code is a little outdated, so I've spent the better part of a week updating/revising the code to work properly and I am happy to report that it is (mostly) working.

Essentially, I am trying to make a single led light up from based off a origin point (lat, lon) and using distance and bearing. I used PyGeodesy to calculate my distance and bearing to the input lat and lon. So I have everything I need. However, I can't seem to get it to work properly. I believe it is because my distance is too large; when my input is closer to my origin point, it works flawlessly. To be frank, this is my first time working with python, json data, and pygeodesy. I don't need a complete answer, so if someone could point me in the right direction, that would be awesome!

It seems my hang up is all in the find_points function.

def find_points(dist, bear):
 dist_adj = 63 / 10.71
 bear = (bear - 90 - 29 + 360) % 360
 print (bear)
 bear_rad = radians(bear)
 print (bear_rad)
 adj_mat = [[cos(bear_rad) * dist_adj, -sin(bear_rad) * dist_adj],[sin(bear_rad) * dist_adj, cos(bear_rad) * dist_adj]]
 start_mat = [dist, 0]
 xy = np.matmul(adj_mat , start_mat)
return xy[0], xy[1]

the respective values for dist and bear going into this function are 12050.054(meters) and 341.386 (decimal degrees). I guess my real question here is that I don't understand what the dist_adj is for/based off of (very little info was provided at source).

EDIT: I was able to reach out to the original coder for clarification on this variable and he was kind enough to help me.

The dist_adj variable was the led matrix length (64) divided by the map length in km. I still ended up being off by 5km in both axes but was able to troubleshoot it and come up with a solution.

All these these formulas (not to mention python, mqtt servers, and json data) were all new to me. I feel a little silly not realizing what that variable was for, but I think too much new stuff at once temporarily fried my brain.

Anyways, count this one solved. :)