Battery Logging with Example Script

[cds12]

I am trying to implement a way to log battery levels for a swarm. I was trying to reference the basiclog.py and how they implement it with a stabilizer. Is this possible if so is there an example script on how to log battery levels for a swarm?

[jonasdn]

Hi!

I am not sure there is a example, but you should be able to do it with the Swarm class, with something like (untestedd, might not work):

Code: Select all

uris = [
  uri1,
  uri2,
  ...,
  uriN
]

cflib.crtp.init_drivers()

def setup_logging(scf):
    config = LogConfig(name='pm', period_in_ms=500)
    config.add_variable('pm.vbat', 'float')
    scf.cf.log.add_config(config)

    def callback(timestamp, data, config):
        print(f'[{scf.cf.link_uri}: {timestamp}][{logconf.name}]: ', end='')
      	for name, value in data.items():
            print(f'{name}: {value:3.3f} ', end='')
        print()
        
    config.data.received_cb.add_callback(callback)

factory = CachedCfFactory(rw_cache='./cache')
with Swarm(uris, factory=factory) as swarm:
    self.parallell_safe(setup_logging)
    time.sleep(100)

Regards
Jonas

[undays]

Hi I tried writing a variation of that code you posted to get a swarm to ready battery levels but it was unable to do so. I am getting a weird python syntax error (new to python) so if you could help me out that would be cool

My code is shared https://pastebin.com/1rmBeLxr as I got banned from posting before because of the length of my code I think.

Basically my issue is that my method when I call swarm.parallel it would not recognize the method I defined. I used the method you created above. Thanks in advance.

[jonasdn]

Hi, could you please paste the error you receive?

[undays]

This is the error I am getting when trying to run the code for my two crazyflie drones. I feel like this is a really simple python syntax thing that I am not getting. I don't really understand why when I call swarm.parallel_safe(setup_logging) it is unable to find the method that we defined already in the LoggingExample class. Any clarification would be grateful to debug this problem. Thanks.

[undays]

https://imgur.com/gallery/GUmEO0C sorry this is the link I don't know why the image does not load.

[jonasdn]

Hi,

It should probably be le.setup_logging.

[undays]

I am trying to print simultaneously the battery levels of my 2 drones. The code I have and am using is linked here https://pastebin.com/NiMuAZkP

I am trying to work through my GetBattery method which would display the battery however to my attempts, it seems to only display the first URI0 CrazyFlie's values. Any idea on how I can approach this to print out the battery level for my swarm? I am using the basiclog.py LoggingExample class to add variables which I will also include in this link here https://pastebin.com/4uYEs4sJ

Thanks.

[jonasdn]

This is more of a Python question unfortunately, you will have to keep learning and dig at it!

But, I would say, maybe a better approach would be to set up asynchronous logging callbacks (see this guide: https://www.bitcraze.io/documentation/r ... log_param/) for each of your Crazyflies and handle the battery displaying in those callbacks?

Good luck!

[undays]

ah yes, it finally worked out thanks for your guidance. I also am curious about the value I am recording, they are in intervals of 10%? Is the CrazyFlie limitation only able to read the battery level in output intervals of 10%? I am currently using pm.batteryLevel to retrieve the data regarding battery life. Thanks.