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I have Bluetooth modules installed INSIDE all my radios, along side with frsky or multiprotocol modules. never had a loss of control.. If your model is electric than I think the ESC would have stopped the motor if the PWM from the receiver had stopped. That makes me possibly exclude an eventual brow...

We need more details please.
Which processor your radio has?
Which version of er9x did you download and where did you get it from?
You said you have a backlight, which backlight and how did you connect it?
How are you powering the radio? which battery?

joão

Not the PRO. Frsky reached long ago an agreement with the company that produced the 9XR-PRO. Mike means that SPORT telemetry support will be disabled on the T12 until they reach an agreement with Frsky. The SPORT telemetry is not open, so any other commercial product can only use it if allowed by fr...

As far as I understand from his post, he didn't have failsafe programmed. It seems the receiver assumed the last position received. Not a very good idea with a fast IC powered aircraft.. :o João EDIT: something just came to my mind. Perhaps a receiver brownout? Itf the receiver battery voltage gets ...

2.66V might mean that something is using too much current and overloading the regulator. It could be the CPU itself as Kilrah also mentioned
But yes, a close inspection could reveal some problem. try disconnecting stuff like the gimbals, etc.

João

Yeah, I know at least one regulator that lets pass the input voltage to the output if the output was shorted. No short circuit protection. It happened to me. I think there is a reversed diode between the output and input, and if it goes bad, normally it shorts. This regulator could also suffer from ...

well, something could be pulling a lot of current. It could be the processor, or it could be something else.. and if this is the case, replacing the regulator will probably not fix the problem. I could be wrong of course..

João

If the CPU is that hot you could have short(s) between two or more of its pins, or somewhere else on the board..

João

I think you would better use Er9x on your 9x radio. OpenTX developers are not developing for it anymore. Er9x is still being developed and maintained. and it has support for the multiprotocol module as well..

João

Just use your custom screens and forget about the other data. The flight controller might just be sending random values for the fields that don't have sensors, I think.

João

So I must be spacing out? Gave it a try today after some sleep and coffee, with an emitter follower and then common emitter. The mode that looks correct to me is having the led connected from the Tiny85 output pins to ground. The common emitter with the led in the collector seems to look correct fl...

yep, it is as ReSt says

João

Wow, that is a really old firmware. I strongly recommend to update.. Try the "Radio Setup / DiagANA" menu. I believe that at the bottom of the page you will find a field to calibrate the radio's battery voltage. That firmware is so old that I don't remember anymore how it looked like, and what optio...

Well, I didn't look at the code yet (not at the PC), but now that you mention it, the LED can be connected from the VCC rail to the pin, or from the pin to Ground. This could explain the inversion you are seeing. If the LED is connect to VCC, the pin will connect to ground to turn it ON. If the LED ...

Drive an N Mosfet directly from the ATtiny pin, or a P channrel Mosfet from an NPN transistor. In this case, base of the transistor to the Microcontroller pin, emitter to ground, and.collector to the Mosfet gate..
Place an 100K resistor between source and gate so the Mosfet can turn off..

João

Thanks Mike.. Will try to test it on Friday. Too busy with work tomorrow.. Not complaining though

João

Thanks Mike.. I think I found a suitable Mosfet in my components box :) AO3401, which was used on the first Ar9x board (I think), and then replaced with the AO3407A. Both are identical, but the 07A has a higher maximum Vgs, 20V against 12V from the AO3401. The 3401 has a lower Gate threshold voltage...

Thanks Mike, what MOSFET is that one? Can't really understand the markings

João

Yep, I also thought of that one

João

You need only half of the movement.
I guess you already tried something like

CHx 50% FULL (switch) AIL

João

Thanks Mike, I have been quite busy lately, but I have a radio with skyboard open on my computer desk, so I think I could test on that one.. Did you find a through hole low Vgs P channel Mosfet? Or did I misunderstand your post as usual? ;) I do have a few logic level P channel Mosfets, but they are...

Because you don't have to remember to change the switch settings for different models. The radio will do it for you automatically when you change models..

João

Understood.
Just a note, Ersky9x, which is a more advanced version of Er9x (more features) also runs on Frsky radios. The menus layout is basically the same, so you wouldn't have to get use to something else.

João

Mike, Through hole N channel Mosfets are more readily available than P channel. this would allow people to build the circuit on a bit of stripboard. Could something like in the picture be used? I tested the circuit in a circuit testing software and it seems to work. Although the BS170 datsheet state...

Ok, your choice.. :) The extra RAM of the m2561 is really welcome as it allows for features not possible on the m128. Er9x supports way more extra hardware than opentx, which only supports a parallel voice module as far as I know. Also, development for this board seems to have stopped. Er9x continue...

A BJT is controlled by current, so won't turn on unless something actively pushes current through it. Well, as I said above, I have seen the opposite. The circuit wouldn't turn off if I didn't connect a resistor between base and ground. Looking at the circuit Mike posted (without the resistor), tha...

Thanks Mike, I see you omitted the resistor going from the base of the BJT to ground on your first schematic. Won't that prevent the transistor to turn OFF? Or is it enough when you pull the processor pin low? Also is the pin floating at any occasion, for example, at power ON? That could activate th...

I have a few P Channel Mosfets which are logic level. Will try them when I have some time.. The problem is most of what I have are.SMD

Thanks
João

You could have upgraded to the m2561 instead. It has the double of the RAM as well.
I believe it also has a couple more pins that can be used for extra switches..

João

I still don't use the boards file they provided for the IDE, I still do it the old way because it works.. Actually, it has been a while since last time I updated my modules because they do all I need and work well. I suggest you install the new boards files on the IDE. I think they made it even easi...