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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...

That can be done with an ATtiny, or you have another type of circuit in mind?
If it is the same as you do for the power modules, than the circuit I use will work without modification??

Thanks

João

It will Reinhard Well done.. Hopefully the weather is good tomorrow

João

If the LED blinks, it is trying to tell you what is wrong..

See here

https://github.com/pascallanger/DIY-Mul ... hooting.md

João

Good idea Mike, I already use the Tiny85/45 for my module switcher circuit. If we do this the way you described, would you mind leaving the other way also in, as some of us might have already working las it is now and wouldn't want to mess with it, and don't mind using another little board for the B...

In theory, but they all have different possible "spare" signals, if they have any at all, so would take time to allow selection and configuration. Mike Thanks Mike, For some of the radios that normally do not have a module switching circuit, there is (as you know) the little board I made that allow...

Would it be possible to add something like this to the other Ersky9x radios?

Thanks

João

Did you remove or insert the module with the radio turned ON?

You will probably have to open the module and check why you don't have voltage where you should.

João

Good that is working
I don't think the simulator can simulate the voice alarms yet

João

Please let us know if it fixed the issue..

João

Ahhhhh, I think I know what is happening. I keep forgetting that some sources in the voice alarms are not displayed in percentage, but in digital steps ranging from -1024 (-100%) to +1024 (100%). Please insert a value of +1024 instead of 100. 100 will give you a value just above center stick. this m...