Search found 8 matches

by mcmatrix
Tue May 16, 2017 11:11 am
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

Last version of single internal rf module switch. rf_int_module_switch.jpg Currently using attiny25, maybe attiny85 is better (more ram). Code itself will fit both. The initial bugs of RF_Module_Power_Switch_Attiny85_Code_ver2.ino software also fixed. Atleast in a test bench everything was working. ...
by mcmatrix
Mon May 15, 2017 4:38 pm
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

May I ask what is the problem with the original code? :) João Sent from my thor using Tapatalk Probably nothing :) I just liked the Mike's idea to use pin change interrupt. Currently i'm not even sure that pcint version is correctly working. Need to test it a lot before I dare to use it with real f...
by mcmatrix
Mon May 15, 2017 4:04 pm
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

OK, the resistor is replaced and I also installed recommended (when Vin more than 9V) electrolytic capacitor between GND and BAT+ near to regulator pins. Made new software version using pin change interrupts. The software is currently untested (don't use it with real flying models). RF_Module_Power_...
by mcmatrix
Sun May 14, 2017 8:13 pm
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

The mosfet pulldown is there.
IMG_0955.JPG
You're right, i didnt had 470k so i replaced it with 100k :)
But if the correct value is important then i'll find tomorrow 470kohm and replace it.
by mcmatrix
Sun May 14, 2017 7:38 pm
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

I'm using Turnigy 1500mAH LiFe 3S 9.9v Transmitter Pack. Nominal voltage 9.9v, fully charged 10.x something, so it should be in safe range. The regulator is a small step-up/step-down converter S7V7F5. It has very nice wide input voltage range. I havent yet programmed the chip but I'll post the resul...
by mcmatrix
Sun May 14, 2017 1:22 pm
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

Made it just for internal module. Ext module can be removed physically.
ppm_switch_module.jpg
ppm_switch_module_back.jpg
GND is controlled by the mosfet.
I havent tested yet, hopefully it will work.
by mcmatrix
Fri May 12, 2017 10:41 am
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

You can use an N Channel Mosfet. it doesn't need the transistor then, just connect it to the Attiny via the resistor. Something like this. The mosfet in this case has a few advantages over the transistor. For example, less resistance when ON, and therefore less dissipated heat so it can handle more...
by mcmatrix
Fri May 12, 2017 9:22 am
Forum: Other Electronic Projects
Topic: RF Module Soft Power Switch for AR9x, Skyboard, 9XR-PRO
Replies: 61
Views: 63555

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

I'd like to build similar circuit using veroboard and dip components. I was wondering if this circuit switching part (trans+irf) can be made simpler. For example just using one npn transistor 2N2222A (ofcoz the circuit has to be simplified and redesigned a little). Does anybody know what is the powe...

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