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Connect RI to reset of Feather
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Connect RI to reset of Feather

by geo_stef on Mon Oct 08, 2018 6:37 pm

I have a Feather M0 connected to and 808 Fona. Some times the feather freezes and I want to reset it remotely.

I've thought sending an sms to fona and through the RI pin connect it to RST of the Feather. Is that possible? When I do it I get some weird behaviour like sort circuiting.

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Re: Connect RI to reset of Feather

by franklin97355 on Mon Oct 08, 2018 8:46 pm

When I do it I get some weird behaviour
Exactly what is the behavior you get?

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Re: Connect RI to reset of Feather

by geo_stef on Tue Oct 09, 2018 3:06 am

When i connect the ri to rst the blue led of fona is very low. If i do a voltage divider may this work?

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Re: Connect RI to reset of Feather

by geo_stef on Tue Oct 09, 2018 1:17 pm

Is it possible to reset feather m0 by a signal from RI?

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Re: Connect RI to reset of Feather

by adafruit_support_mike on Wed Oct 10, 2018 3:46 am

That should work. Pulling the Feather's RST pin low will force the microcontroller to relaunch the bootloader, and RI generates a 120ms low pulse.

It will reset the microcontroller every time a call arrives though.

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Re: Connect RI to reset of Feather

by geo_stef on Wed Oct 10, 2018 6:27 am

the RI stays low after reset so the board cannot start up again

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Re: Connect RI to reset of Feather

by adafruit_support_mike on Fri Oct 12, 2018 3:32 am

Put a 10uF capacitor between the RI pin and the Feather's reset pin. The capacitor will charge back to 3.3V even if RI stays low.

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Re: Connect RI to reset of Feather

by geo_stef on Fri Oct 12, 2018 4:24 am

what kind of capacitor?

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Re: Connect RI to reset of Feather

by adafruit_support_mike on Fri Oct 12, 2018 11:41 pm

It doesn't really matter.. a non-polarized ceramic would be easiest, but you can use an electrolytic if you make sure the positive side is connected to the Feather's reset pin.

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Re: Connect RI to reset of Feather

by geo_stef on Sat Oct 13, 2018 12:32 pm

is it possible to have an RI only on SMS receive?? Because we get RI on GPRS Traffic also

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Re: Connect RI to reset of Feather

by adafruit_support_mike on Sun Oct 14, 2018 1:39 am

The RI pin's behavior is hardwired in the SIM800 module. There's no way to change it. Whatever it does is whatever it's going to do.

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Please be positive and constructive with your questions and comments.