Warning: Do not attempt to install earlier versions of firmware than 2.4 b8 as this will stop the board from functioning and it is not possible to re-flash new firmware to the board without it being returned to us for repair which will incur a charge!
Warning: Do not increase the baud rate of the board to anything more than 115200 as this will deactivate the bluetooth connection (it cannot cope with anything higher than a baud rate of 115200). If you do select the higher baud rate and "write" it to the board you will no longer be able to communicate via the bluetooth connection and the board will have to be re-set to its default configuration by pressing the menu button 10 times - beware this will erase all of your PID settings so make sure you make regular backups! If this fails then the board will have to come back to us for a factory re-set. The latest GUI should now have a warning about this. In addition from firmware revision 2.50b5 there will be an option to click the menu button 12 times will will revert to a baud rate of 115200 without a full re-set.
Warning: Do not attempt to disconnect or reconnect the IMU's whilst the main board is powered up as this is very likely to damage the IMU's.
What is the Bluetooth Code :
The Bluetooth pairing code is 1234 for setting up the bluetooth connection go to the Alexmos "How to" page.
PID's settings are confusing me - is there a guide?:
Yes! Click Here
I can't get my Frame IMU (IMU2) to work:
Before the second IMU can function - it needs to be "activated" - go to the "advanced" tab in the GUI, look down to the left and you will see a box called Frame IMU with a drop down menu next to it. Select the appropriate setting and then you will be able to calibrate and use the 2nd IMU.
I can't seem to understand why the 3rd axis doesn't have an absolute reference. If upset should return to the initial position right?:
Go to the GUI and check the "offset" in the Follow Mode is set up.
Please note that in the Follow Mode, YAW will snap to nearest magnetic pole, not an absolute reference. �In Lock mode, YAW will always return to the initial (startup) position
Can I use a higher voltage supply or a regulated supply? :
The V3 (32 bit board) can take up to 25v (6s) and has an inbuilt regulator.
How do I connect the motors to the board - I do not have any JST-XH plugs to terminate the wires?:
The plugs for the motors are 2s JST female plugs. You can use male JST-XH plugs (click here to buy) to ensure a tight and secure fit for the motor cables or if you prefer you could use servo connectors but we would suggest you secure them in place with perhaps some tape to ensure they stay put. The V3 (32 bit) board is supplied with 3 x motor cables
I'm seeing lots of I2C errors:
- If you are seeing I2C errors it is likely that there is some kind of electrical interference/noise present. This usually comes from either the power supply (ie the lipos) and or the motors.
- Here are some suggestions to try:
- If you are using the main flight packs as the power supply try using a separate 12v lipo and see if that makes a difference, if it does then the noise is coming from your flight pack and you will either need to regulate the supply to try and clean it or use a separate supply.
- Next, if your IMU cable is co-located with either of the motor leads then it will almost certainly pick up noise from the motors. Move the IMU away from motor cables (if you are using a carbon frame put the imu on the opposite side to the motor cables as the carbon will act like a screen.
- Next, the IMU cable is made up of 4 thin silicone leads, twist them together so they look more like a single cable, that may help to prevent them picking up the noise from elsewhere.
- Next, try putting a ferrite ring (available in our shop) on both of the motor cables as near to the board as possible. (You will need to wind the cables through the ring several times)
- One or several of the above should solve the problem.
How does Acceleration Compensation work?:
We could write a whole chapter on this but perhaps the best thing is to leave the explanation of how it works to the much respected Fabien - take a look at his RC Groups thread - just click here
How do I upgrade the firmware on my board?:
Use the GUI - click on the "firmware upgrade" tab