TinyTwo Speed Controllers

[Roboteernat]

Do you still have any available?
May be after 2!
Cheers

[Rapidrory]

Plenty of the low voltage ESCs still available, won't be able to make any more high voltage ones until after the 11th though.

[Rapidrory]

It turns out that the N2xV is not currently compatible with the deltang range of receivers. I am working to rectify this.

[peterwaller]

Not sure if this is the same thing but I had trouble with the DT receivers.
There is a problem with the output for the throttle channel usually used for the weapon.
With the servo plugged in the levels are just a bit low and can cause problems.
A 4.7k pullup resistor on the output fixes it.

[Rapidrory]

I'm not 100% on the cause of the problem yet, but I think it's the similar to yours in that the deltang is failing to drive the signal inputs... although the signal input lines already have a 35k pull up to 4.5v set in the microcontroller. My solution was gonna be switching the pullups off to give it a high input impedance to drive which would hopefully sort the problem. I don't have a Deltang myself, which makes diagnostics a little more tricky!

[peterwaller]

Scott also had problems as below

Sorry for hijacking the thread somewhat, but it is related to Deltang recievers!
I've put a RX31 into Zenith, as I wanted to save a little bit of weight so I could add something to help it self-right. However, I cannot for the life of me get my brushless ESC (Pheonix 10) working on the throttle channel. It works fine on one of the other channels, so I'm sure the ESC isn't the problem. I've tried 2 different RX31's, and have gone through the programming on both to ensure that the settings are correct, but I just can't get the ESC to "arm", which is what it does at the bottom of throttle travel. I've checked the travel of the throttle vs the channel I got it working on (ailerons) on the DX6i's "monitor" screen, and the travel of the throttle channel is about the same, if not slightly more than the ailerons. I've even tried increasing the travel, putting the trims right to the end, binding with throttle up, throttle down, throttle middle, trims in every position, etc. and I just can't get the ESC to arm.
Has anyone experiences any similar woes with the RX31, or does anyone have any idea how I might resolve this?
Thanks in advance.

My reply

I haven't experienced this problem and the previous version of combatant had an RX31 driving a brushless controller on the throttle channel.
What I did have problems with was on one of my controllers that had a servo plugged into the throttle channel and altough the servo worked OK the load on the output reduced the output signal enough so my processor didn't see the pulses. I fixed that by a pull up resistor (about 4k7) from the output to the 5 v.
This may not be the same problem but it could be worth a try although I don't know why it should be different from say the aileron output which you say works.
I have just checked the old combatant and the output signal is about 3v.

Scott

Pete, you're a lifesaver. Popped a 4k7 resistor between the +5v and the signal wire on the brushless ESC, and bam, worked straight away.
I'm somehow ready for a big event 4 days in advance...this feels strange.
Edit: I also e-mailed the board's designer asking for advice, and had this back:

Hi Scott,
Thanks for buying my receivers and sorry for the problem. The pads for Ch1 and 2 are used for programming the chip and only have weak pullups for creating the high part of PPM pulses. Some ESCs need a stronger highs. I suspect this is the issue. Some options:
1. Use the Tx to make thottle appear on another output. Probably difficult with the Dx6i.
2. I can change the Rx program to swop ports. I'd probably reverse the order of all the pads. You'd have to send your receivers back for the new program to be installed. I live in the UK.
3. I can swop the Rx31 you have for the new version Rx31d. This has a resistor to help pull the port high which is how Spektrum use that port. Disadvantage is the new version is slightly larger.
4. Try a different ESC.
My instinct is to try option 2 next but let me know your thoughts.
Regards, David.
Awesome to know that the customer service is fantastic . Although he mentions both channels 1 and 2 being used for programming, there's obviously some difference between them, as channel 2 is the aileron on which it worked fine. I guess the thing to do in future is to use the Rx31d for things with brushless controllers, just to be safe. It would also be good to have a list of ESCs that we know do and don't work with the RX31 on the throttle channel.

As Scott says David at Deltang http://www.deltang.co.uk/ is always very helpful and knowledgable an very local to you so it might be worth contacting him if you are still having problems.

[EpicentrE]

It was me who was using a Deltang receiver with Rory's board, so I've already told him about the issues we had previously . I've swapped to a Spektrum receiver for now, and will be giving Rory a Deltang receiver at the AWS in order for him to investigate this more.

As a side note, a Deltang receiver mounted to the NanoTwo makes for a tiny overall package. Because of the height of the capacitor at the back, the overall size doesn't really increase at all when adding the RX! Here's a picture so you can see what I mean.

[Rapidrory]

That looks very nice at least! If I can get it working, it would make a great little package when heat shrunk to it. Just have to hope there isn't trouble with noise coupling into the signal lines if they're a little on the weak side; I have got noise suppression on them but at that proximity it might not be enough... Have to get it working first though! As I say, I'll try and get the diagnostics with the deltang done at the AWS, but if I don't get time to do it properly, would it be alright to take one with me and then ship it back to you with the updated ESC after diagnostics?

[EpicentrE]

Yes, that wouldn't be a problem. I'll also try to dig out a Deltang RX31 (which is the type of RX I usually use, but am not in this case because of the aforementioned problems with RX31 and brushless ESCs) so you can check that whatever fixes you employ work for that as well.

Thanks again for all the help so far, and for the boards!

[Rapidrory]

After an accidental experiment, I've discovered that although the N2LV really doesn't like being run on a 3 cell lipo, it doesn't actually appear to damage it.

I was putting together my new 3 cell spinner and stupidly used a N2LV instead of an N2HV. It all worked fine; wheels went round when you moved the sticks etc, but the whole thing got very very hot. Having realised my mistake, I plugged it back into a 2 cell and it seems to run fine.

This is NOT saying you should run an N2LV on a 3 cell, just that if you make the same mistake that it's probably not terminal!