DX6i mixing

i think this is a common problem but i am wondering if people can help me with it. Im using a DX6i with the ELEVON option selected. To counteract the 50% throws and get full speed/ power, ive used the following youtube tutorial: http://www.youtube.com/watch?v=6Ewa79_9Iq4

The bot, which uses two self-hacked 85a ESC, works perfectly fine until for example you push the stick above 75% forward and 75% left, expecting the bot to start turning as the left side of the drive slows down and letting the right side bring the bot around to the left. At the moment, its doing the opposite in this situation and bringing the bot around to the right. it works as intended at lower speeds and when using the ELEVON option on its own without the messing with the 50% throws.

Cheers

Dan

is the servo reversing in the right position?

yup! theres no servo reversing in use as ive wired it up so it wasnt needed.

I have a similar issue. I get full throttle forwards but only about 25% throttle backwards on Binky. Thinking of buying an external mixer, I already have one from The Robot Market Place, XR1... i think

ive tried an external GWS mixer and its still the same problem. i think its a common issue but there must be a way around it. I've got a plan B which involves tank steering so gonna look into that too

Quote:

---

Originally Posted by Eventorizon

I have a similar issue. I get full throttle forwards but only about 25% throttle backwards on Binky. Thinking of buying an external mixer, I already have one from The Robot Market Place, XR1... i think

---

I would check your travel adjusts, navigate to travel adjusts and check all the numbers are at 100% then move each stick forwards then backwards then left then right to make sure the values don't change, I have problems before whe I had a Travel adjust in direction and not the other.

With my dx6i I haven't had any problems with the mixing.

Quote:

---

Originally Posted by Max

Quote:

---

Originally Posted by Eventorizon

I have a similar issue. I get full throttle forwards but only about 25% throttle backwards on Binky. Thinking of buying an external mixer, I already have one from The Robot Market Place, XR1... i think

---

I would check your travel adjusts, navigate to travel adjusts and check all the numbers are at 100% then move each stick forwards then backwards then left then right to make sure the values don't change, I have problems before whe I had a Travel adjust in direction and not the other.

With my dx6i I haven't had any problems with the mixing.

---

I don't think there is anything wrong with the mixing but purely using the ELEVON function means ull only ever go 50% of the possible top speed. Using the mixes 1 and 2 means you get the 100% throws but it messes with the ELEVON function.

correct same issue on my robot , used mixing built into sabertooth to fix the problem

I'm thinking there must be a way of doing it. Im pretty sure my Tx did use to do it anyway so god knows whats changed.

Hi everyone,

Ive now tried everything to sort this problem and made little progress. The Botbitz ESCs shut down if the travel signal goes over 100% (i dont see why it couldn't have been programmed to just stay at 100% instead of doing that but anyway) and when i use the mixing above in the DX6i, it sends the travels way over this. Using the travel adjusts doesnt seem to limit the mixing for some reason. All this has been tested on a brand new Tx which i bought today.

I've tried the hobbyking T6A-V2 system which the botbitz ESCs were built around but there is no way of telling whether the motors are going 100%. The mixing on them is a little obscure as well but i was able to use the system at Burgess Hill but it really bugged me that i never knew if it running to its full potential.

If anyone else out there uses a DX6i and botbitz ESCs, may I ask what mixing you are using?

Also, what other Tx, Rx and maybe external mixer set-ups people using with the botbitz ESC which seem to work fine? (failsafe, doesn't do anything crazy with the mixing etc)

Cheers

Dan

A fairly crude way to know if you're running the motors at 100% would be to put a battery onto them directly, listen to the tone, then do what should be full throttle on the tx and see if there is a marked difference in the sound.

Tried that and it's very difficult to tell the difference. I also tried putting a multimeter on the motor terminals to compare the voltages being sent to the motors but at the higher end of the throws, it goes crazy and can't seem to measure it. What Tx and Rx set up do you use on Tormenta 2?

If you can't tell the difference in tone between the battery directly onto the motor terminals and going full throttle at the transmitter then chances are you are getting 100%.

We use a Planet 5 transmitter and receiver kit, a v-tail mixer, and the Botbitz. Very simple, only complaint with the tz85s I suppose is that when you put the stick fully into a corner of its travel, it doesn't move. I assume this is some sort of mixer+tz85 combined issue as it didn't happen when we used to run electronize. It's not a problem in the arena, really, as you rarely want to do donuts anyway. :P

We use DX6i's and Botbitz on both our machines. As I said before, the only issue we have is that it goes faster one way than the other.

The mixing is set to Elevon. We have one channel reversed as I prefer to wire up my motors so that I have the positives on the same edges as the motors so It makes it easier to see the flow of power through the machine.

The Big Nipper guys messed with my TX at GSL to sort the speed issue with Conker but that was it, Speed only.

Try rebinding the RX with everything reset to defaults then edit from there. If you edited before had then it could have given the RX and ESC's false centre points or something... no idea really, just a thought.

Using purely elevon on a dx6i limits top speed in forwards and backwards directions to 50%, and will only reach 100% if spinning on the spot which on a rambot isn't what you'd want. It might be that I may have to upgrade my Tx to a more adjustable unit.

you could just get a v tail mixer there not expensive, i use the cheap ones and havent had any problems but i dont use the tz85 esc

You can't directly measure the voltage out of an ESC as they don't vary the speed of the motors with voltage they vary it with switching. So they pulse the motor with full voltage at different frequencies to achieve the equivalent power input. So no matter what speed the motor is doing the voltmeter is reading full battery voltage being switched between 0 and full constantly.

I have one of the older DX6i's but I've not seen this problem before always getting 100% output in turning or forwards/backwards!

Been doing some research into all this. The only way to get proper mixing like you'd want on a bot would be to use a Spektrum DX8. The Hobbyking set is a bit better in terms of the mixing.

I'd love to use a v-tail mixer but dont people have issues with them at the higher ends of their throws like Ellis said?

Yes and no. In our particular setup, with a Planet T5 tx and rx set on one side of the mixer and the tz85s on the other, it so happens that it's not perfect. But it isn't what I'd consider an issue, at all. I have never noticed the oddity in the arena across the 30 odd battles Tormenta 2 has done.

We didn't get it from this seller, but this is the model we have: http://www.ebay.co.uk/itm/GWS-V-TAIL...item20c29a50cf

In Tormenta 1 we ran an identical setup to the one we have now, but with Electronize instead of the Botbitz, and the oddity wasn't there, so chances are it's something that can be fixed anyway.

For at most 10 quid, it's worth a shot?

Edit: as for "don't people have issues..." I can't speak for others, but I don't think this is a common problem with mixers. :)

i haven't had any noticeable issues yet with the v tail but again i don't use the tz85


this is the 1 i use (might be worth testing before you spend a load of money on a new transmitter)
http://www.ebay.co.uk/itm/NEW-TURNIG...item35bfe5ab61

but some people prefer GWS v-tail mixers

cheers guys. Funnily enough, i have both of them already. Will have to spend an afternoon giving them a go.

didnt work! I'm having a closer look at these hacked Tx sets (http://www.overkillrc.com/gt3bfeatures.htm) but the hobbyking set will do for now. thanks again for all your helps guys.

Hi Dan

I'm having the same problem with my Dx6i and TZ85a's. As far as I know the issue is something to do with the program on the hacked ESC's and them not being able to interpret channels mixed in a certain way. It might have something to do with the RX your using. I've got the cheap Orange RX's but I know people running exactly the same set up with an AR6110 in place of the Orange didn't have any drive issues at GSL.

The problem is that when the input signal to the ESCs goes above 100%, they shut down. This is programmed in and I've contacted botbitz to see whether this could be changed. If you use the elevon function and those mixes for 100%, it sends the signal to its max possible value.

I've got both those receivers and neither makes any difference. Will keep working on it.

Quote:

---

Very simple, only complaint with the tz85s I suppose is that when you put the stick fully into a corner of its travel, it doesn't move. I assume this is some sort of mixer+tz85 combined issue as it didn't happen when we used to run electronize.

---

I noticed this problem as well, using a mixer which I am assuming is identical to the Turnigy one posted earlier (got it from GiantShark). Tony and I suspected it to be the mixer that was the issue as the same problem occurred in the small kits we ran at GSC, but if it's happening on the GWS mixers too, then I would assume it's something to do with the programming in the ESCs (incidentally, the small kits mentioned were running BotBitz 10A units).

While it may not seem to be a major problem, it does mean that you're not able to command your robot to turn around one wheel at full speed and if it cuts out instead of this, it could be a split second action that affects the course of the battle.

Will mess around with some other mixers and see what the results are.

Having the same problem. Using a DX6i with orange receiver. TZ85a with hacked software. Spotted this when benchtesting my bot.
Agree its an issue in control of the bot and it needs to be more precise
Havent had a look at the software to see if it can be programmed out

Had a quick look at code and the calibration software still seems to be there.
Away at present so havent been able to check but have a look at the tz85a manual
http://www.hobbyking.com/hobbyking/s...%20%281%29.pdf