Hubsan x4 (H107) Support

You can find some more info in the RCGroups Devo thread. One other user attempted to use the code with a V911 module but was unsuccessful. However, his module is not working properly which is probably the cause. there is nothing confidential about it, but the number of folks who can build the firmware themselves and have an X4 and the V911 module installed is pretty small.

Unlike the V911, the Hubsan uses a handshake between the Tx and Rx during binding. This means the Tx needs to be able to receive signals from the Rx. the V911 module does not have an antenna connected to the LNA (receive pin), so my expectation was that it would not work with the Hubsan. However, when I actually tested it, I was surprised to find it works ok after all. This may be buyer beware. I cannot guarantee that all V911 modules will work. The '500m' and XL7105 ebay/aliexpress modules both have the receive-pin connected to the antenna, so I would likely recommend one of these.

Having said all of that, it is possible to bind to the Hubsan without the handshake (it is just less reliable). If anyone has the V911 module and is unable to bind their Hubsan, I'll implement a 'handshake-less' mode that'll work without needing to receive anything from the Rx.

One last note. I currently only have a '500m' module in my Devo8, so it is the only one I've tested with. I did install the V911 module in my RaspberryPi, and was able to bind with it there using the same code that is in Deviation.

Here you go. You need, at a minimum, to install the 'media' dir from the filesystem along with the dfu.

Also note that on the hubsan, the elevator is reversed, so setup a '4ch w/DR' template, and then reverse the elevator.

The Hubsan Tx has a mode where you push down on the cyclic to enter 'expert' mode. I thought this just adjusted the output range, but maybe it also controls the 3/6-axis mode. I'll need to check the protocol further to see if there is something additional needed in Deviation.

Well, I only spent about 3hours decodingthe protocol, and at the time, I didn't realize there was an agressive mode. I'll work on it before the final release.

2 things:
try setting the 'scale' (in the limit page) to 150, and see if that lets you flip. I checked it, and the only thing expert mode does is to disable dual-rates. I currently have the 100% set at the dual-rate value, and 150% will be full rates. I'll fix that in the next build.

I'll check my V911 and see what is going on. I made some changes to the V911 protocol to enable changing the power output. I may have broken something.

I just tested. setting ele and to 150% did indeed allow me to flip (and crash terribly). You do it the same way as with the official tx (back then forward)

rototophe wrote:

PhracturedBlue wrote: allow me to flip (and crash terribly)

Thanks PB, this is good news, hope you didn't break anything on the quad

Nah, no damage. I was only a foot off the floor when I flipped it. I'm not a good enough pilot to recover from that.

Here is a new dfu that has full rates from 0-100 so no need for scaling. It also reverses ele and rud channels so they behave as expected. And it fixes the flysky issue