Search found 19 matches

by Radian
Sun Nov 09, 2014 9:52 am
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: Re : built-in USBasp 5V

The 5V regulator only powers the mainboard, which is about <40mA and less than half of the system's total draw. Makes any difference pretty much negligible especially compared to the drawbacks. At least unless you really need to fly night and day for more than the 15 hours or so that the typical ba...
by Radian
Sat Nov 08, 2014 10:32 am
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: built-in USBasp 5V

Hi Bob, I think the trim re-boot probem is another issue altogether but thanks for the heads up - I hadn't come across that one before. The USBasp board wires into some shared signal lines so it can't just be left connected and powered down. Upgrading the 7805 with a switch-mode regulator is definit...
by Radian
Sat Nov 08, 2014 9:37 am
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

Capacitor solder joints are all OK and I used a capacitance meter to check - all read around 0.7uF I think I've eliminated everything beyond the magic that takes place on the glass!
by Radian
Fri Nov 07, 2014 6:53 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

Mmm the elephant in the room here is what happens if you disconnect the BASP from the tx circuit after programming maybe it is producing an unexpected current drain. I've been doing that already Bill - I made it so I can unplug the USBasp inside the case while messing around. Doesn't make any diffe...
by Radian
Fri Nov 07, 2014 6:42 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

Have you used the BURN menu in eepe? There is an option to "Write EEPROM memory from file". This should just write the EEPROM, from the file, without eepe looking to see if the file is valid for er9x. Mike. Yes thank, the option to write eeprom from file was going through the motions without compla...
by Radian
Fri Nov 07, 2014 4:20 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

Rats. Before I've even fitted my boost circuit the display's gone again. I feel I ought to be re-flashing with the stock firmware to see if that exhibits the same problem but I can't update the eeprom. The .epee format I've been successfully loading and saving my er9x eeprom in look like xml i.e. st...
by Radian
Fri Nov 07, 2014 3:39 pm
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: built-in USBasp 5V

Yes, very arbitrary. I will have a poke around to see if it might be possible to swap the pots to AVCC. What reference source does the firmware use? I guess it has to be AVCC otherwise the Vref would need to be fed into the top end of all the pots. The prototype is working now. Switching noise is ar...
by Radian
Fri Nov 07, 2014 2:29 pm
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: built-in USBasp 5V

won't a switching regulator put some noise on the analog inputs? I think that was a reason why people didn't start replacing the 5V regulator with a switching one but used as 7805 instead.. João In simulation there's a couple of mV ripple using the above circuit. I'm not expecting that to cause any...
by Radian
Fri Nov 07, 2014 1:03 pm
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: built-in USBasp 5V

One like this is a simple drop in saves a lot of space: http://uk.rs-online.com/web/p/switching-regulators/6664379/ Hi Bill, yes those are handy - but I'm building a regulator that will both boost sagging USB voltages and buck higher battery voltages. So sometimes the regulator has to put out more ...
by Radian
Fri Nov 07, 2014 11:48 am
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

Re: built-in USBasp 5V

Obviously the stock voltage supply can be greatly improved on. For one thing the 7805 linear regulator is a huge waste of power with a 12V battery input. Using a switch-mode regulator at around 80~90% efficiency, the battery current drain can be halved. So given that I also want to be able to boost ...
by Radian
Wed Nov 05, 2014 10:51 pm
Forum: Electronic Mods
Topic: built-in USBasp 5V
Replies: 18
Views: 4829

built-in USBasp 5V

I hard-wired a USBasp programmer into my TGY 9X and fitted a USB socket inside the case. As usual, the 5V USB power line is connected to 5V on the R/C mainboard. With the main (battery) switch off and USB plugged in the micro obviously runs and (most) things operate as normal. Not quite though as th...
by Radian
Wed Nov 05, 2014 10:26 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

I was just beginning to wonder about the 5V rail tolerance on the chip during programming, it's never been an issue wiith the PIC chips I usually work with but I'm not familiar with Atmel parts or their in-circuit programming. I will keep an eye on this from now on. EDIT: I've started a new topic to...
by Radian
Wed Nov 05, 2014 5:40 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

Re: TGY 9X LCD gibberish

Thanks guys - but I've just had an interesting development: I decided to re-flash my stock 9X firmware backup as a last-ditch resort and to my surprise the display worked straight after it booted. I tried to re-load the backed-up eeprom but eepe complained that the .hex file was the wrong format (I ...
by Radian
Wed Nov 05, 2014 3:56 pm
Forum: Hardware
Topic: TGY 9X LCD gibberish
Replies: 17
Views: 2211

TGY 9X LCD gibberish

After putting up with the stock firmware for a couple of months, I recently flashed my stock TGY 9X with er9x and all was working well for a few days - then the LCD started to mess up. I've searched over these forums and others and see the LCD is prone to some known problems. So I checked the connec...
by Radian
Mon Oct 20, 2014 8:29 am
Forum: ersky9xr
Topic: Telemetry Protocols
Replies: 62
Views: 8904

Re: Telemetry Protocols

I can save the time of anyone else replying by saying that I worked out what was wrong. The values appear to be packed in a different order to the descriptions given in the most widely referenced doc e.g: https://pixhawk.ethz.ch/mavlink/#HEARTBEAT I had to find an example of source code that actuall...
by Radian
Sat Oct 18, 2014 8:39 am
Forum: er9x
Topic: ER9X User Guide
Replies: 124
Views: 61616

Re: ER9X User Guide

Ah, that explains why I found this 9XR video very helpful for instructing me on how to mix two flight mode switches to get six flight modes from my 9X: https://www.youtube.com/watch?v=YczzHkRUVxQ I was hoping to find more info about using 3POS as a mixing source in both sets of documentation but I g...
by Radian
Fri Oct 17, 2014 9:23 pm
Forum: ersky9xr
Topic: Telemetry Protocols
Replies: 62
Views: 8904

Re: Telemetry Protocols

cxlabs - I've been dumping MAVlink data all day in an attempt to extract the sort of info I would like to display. Looking for bit-field descriptions I ended up examining the message description .xml files but not everything ties up with the actual data I get back from an APM2.6 stream. Do you think...
by Radian
Fri Oct 17, 2014 8:49 pm
Forum: er9x
Topic: ER9X User Guide
Replies: 124
Views: 61616

Re: ER9X User Guide

Thanks jhsa - as a software developer myself I understand that most people never bother reading the manual anyway! I'm just the opposite: often I save myself the cost of buying something useless by downloading the manual first. In the case of er9x I liked what I saw straight away.
by Radian
Fri Oct 17, 2014 3:06 pm
Forum: er9x
Topic: ER9X User Guide
Replies: 124
Views: 61616

Re: ER9X User Guide

I have just flashed my TGY 9X with ER9X after thoroughly reading what appeared to be the most recent version of the User Guide I could find (as per MikeB's post on the previous page of this topic). So my firmware version now reads: er9x-r813 V1.275-Mike 14.08.2014 - but the menus are significantly d...

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