RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Projects that are not for RC, but are cool and worthy of development.
mozgy
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Re: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Post by mozgy » Fri Jan 27, 2017 6:12 pm

Heya,
jhsa wrote:Did you think that the 470k resistors might be pulldown resistors on the Attiny85 inputs?? :) I wouldn't put them there if they weren't necessary, specially not with that big value ;) But Im interested if your setup with the fets work.. If they don't it is very easy to just solder the resistors instead anyway.

João
I just did it as a pushbutton circuit, external pullup with mosfet acting as switch or button. I'd be grateful if you can point me to any better and detailed schematics how it should be done, ty.
Don't have any attiny85 atm, should have one next week so I'll testboard it. Similar circuit works with my atmel328p breakboard (no power mosfets, just LEDs).

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Mozz

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jhsa
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Re: RE: Re: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Post by jhsa » Fri Jan 27, 2017 6:25 pm

mozgy wrote:]
I'd be grateful if you can point me to any better and detailed schematics how it should be done, ty.
Didn't you see the schematics on the first post? :o :)
That's the only schematics, the one I made.. i don't think that there is another project like this.. ;) At least I didn't find it :)

João
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mozgy
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Country: Croatia

Re: RE: Re: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Post by mozgy » Fri Jan 27, 2017 7:31 pm

Heya,
jhsa wrote:
mozgy wrote:]
I'd be grateful if you can point me to any better and detailed schematics how it should be done, ty.
Didn't you see the schematics on the first post? :o :)
That's the only schematics, the one I made.. i don't think that there is another project like this.. ;) At least I didn't find it :)

João
I do apologize for not being precise, yes, I did see that schematics of yours, in fact mine is based on yours. What I meant is practice how should attiny pins be connected when acting as input (pulldown, pullup, pullleft ;) ). As I understood from previous arduino (atmel328p) experiments it can be both ways, I just used to build it as a pullup resistor.
If I'm wrong in that assumption please do say so !

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Mozz

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jhsa
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Re: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Post by jhsa » Fri Jan 27, 2017 9:06 pm

Sometimes there are pullup resistors and sometime pulldown. I don't really remember what was the reason for that 470k resistor. I didn't write the code. Just adapted it. I can't code. :) I think someone in the arduino forum did it. Will have to look when I get to the PC. But I do believe that resistor is needed.. That is NOT a voltage divider as you suggested before :) Well, It might look like one, but the value of the resistor to ground is so high that practically all the input signal voltage passes to the ATtiny85 input pin.
My suggestion is try it your way. If it doesn't work for you then change it. The way I posted, it works.
Normally I test everything on a breadboard before I make PCBs to avoid wasting material and money if things don't work. That is the beauty of this. You can test before you build :) I am right now testing something else on the breadboard.

João
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jhsa
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Re: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO

Post by jhsa » Thu Mar 02, 2017 11:34 am

I will be looking at making this even smaller so it can be installed inside a 9XR-PRO. Probably using double sided PCB.

João
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