I’m doing a project for school which uses a holybro x500 v2 px4 with pixhawk 6c flight controller using mission planner. Currently I am getting a few errors one of them being prearm battery 1 unhealthy when im using a 4s battery with 5000mAh with 14.8V. On mission planner when i do connect the battery it comes up with 15.28V ish which is above 14.8V so i am unsure if this is correct.
As of right now i am unable to give logs or specific information as i do not have the drone with me to connect but some guidance would be appreciated so i can check maybe for the parameter settings for a 4s battery with the specifications i am using.
The second problem i have is that the gps has no fix (using holybro m10) and there are no satellites available. I am going to research more into the switch button on the gps as i don’t know what it does exactly.
I also am not sure how you are meant to arm and disarm the drone as im not using an rc controller i have a telemetry radio (SiK v3 i believe) connected to my laptop and one connected to telem1 on the flight controller and the resources online mainly show arming and disarming with a controller.
My final problem is that one time the drone did show up on the gps map but now it does not no matter even if i close mission planner and re connect the telem radio to my laptop. The first time it did show up but not on the correct location as it showed up in Sahara when i am in the UK and even when i have set my home location to UK it did not show up there but now the drone symbol does not show up at all.
Apologies if my post is in the incorrect discussion as this is my first post, as i am using a quadcopter but am unsure of what it is on here.
A fully loaded 4S LiIon can have upto 4 * 4.2 V = 16.8 V.
So propably your settings are wrong.
Where do you test your GPS? If indoors it is normal that you don’t get any satellites. Place it outdoor in a free placee without buildings. Let it run for minimum 15 to 30 minutes that the GPS receiver can collect all necessary information from the system. This is a cold start.
If the GPS has now initial cold start finalized with an fix all position information are garbage. So it is clear that the drone did show up on your real postion.
Thank you for your response. Do you happen to know what the settings should be for the battery type that i am using? As for the GPS, i did try to test it indoors, and realised that the school mentioned there is a gps lock within the building, so i will take your advice and try to use it outdoors. I didn’t quite understand why you said that the drone did show up on my real location, could you please clarify? I’m assuming once i do try to test it outdoors and if the gps does get a fix then the drone will show up again on the map with my real position.
As for arming and disarming using telemetry radios once all of the errors mention have been fixed will that mean i can just set a flight plan and the arming and disarming should just work itself?
For settings of FC parameter some other specialist can support you as I am not using this FC for now.
The drone itself only knows it position after it get a GPS fix. This is the only information source. Initialy the GPS sensor has no information where on the world he is placed. So it starting searching for satellites and is collecting all information of the used GPS system from the first satellite it receives. Only if all this data are collected succesfull the GPS sensor can start calculating its position. If it has not collected all information or it it is loosing the contact to satellites in between it can happen that the GPS sensor calculates a completely wrong position.
Thank you for your help. I will take your advice about the gps, keep it outside for a while to see if the gps will get a fix. I think for the fc I think I have the right parameter settings a I have been using this video: https://www.youtube.com/watch?v=_ketmb8u2UI
I think I did not realise that he was using a different battery and used the same parameters as he did which I will have to change. I am not sure if any other parameters I may have used might be incorrect, but the battery I will definitely change
As of right now, just trying to get it to fly, not even that but first hover at a certain altitude and then maybe perform some basic manoeuvre by setting a flight path. The quadcopter itself isn’t just for it to fly but for communications purpose. Thank you for the links, I will check them out.
It is just a few problems (mentioned first post) which I am unsure about preventing the flight, mainly the battery parameters being incorrect and having to go outside for the gps to get a fix and so the drone will show up on the map as on Friday it did show up but disappeared and reconnecting did do nothing.
You are right, I am trying to do this as soon as possible just because it is a concerning part for me. As for an RC system from all of the tutorials that I have watched have used an RC controller. However, I will be using a receiver and transmitter telemetry radio as the FC is an autopilot and you can pre set flight paths on mission planner and it will follow it.
Those videos have little value relative to properly configuring and tuning an Arducopter mulritotor.
Sure, the craft can be controlled from a Ground Station but it needs to be configured and tuned first. And you will need an RC System to do that.
Right. I did speak to someone else whom is doing the same project but with a different battery and flight controller and he managed to do it as he is also not using an rc and told me that he followed that exact video and it worked for him.
If I just configure the battery parameter settings and and set the drone outside for it to get a gps fix with the satellites should it not then be able to work without a problem?
No, it will not. You need to configure around 300 parameters before it can operate safely and stably.
Not following the known best practices is irresponsible and will just not get you there!
Do you have any recommendations of any websites or sources that can help to achieve this? Never whilst researching anywhere it mentioned that it might take this long to properly set.
Thank you for the link. I have managed to build the drone, its mainly setting up the flight controller, gps, battery and telemetry radios parameters which seem to be incorrect.
Blog post posted by