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Hi

Have anyone succesfully used arduino with dual sim?

I need to send a sms when i get a input on the arduino. But because it is very unstable, i need 2 have 2 sim cards. Does anyone know of a simlar project that have written about it?
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Poole, Dorset, UK
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What do you mean by "unstable". Why do you think a dual sim would fix it? Sounds like you have a hardware problem, power, bad wiring or something.

Start there.

Mark
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What do you mean by "unstable". Why do you think a dual sim would fix it? Sounds like you have a hardware problem, power, bad wiring or something.

Start there.

Mark

Hi

Thank you for the answer. I am sorry i was not clear in my post. The problem is not hardware related, but the GSM network that is unstable. So the dual sim will help, because it will use 2 diffrent GSM networks.
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Dee Why NSW
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Have anyone succesfully used arduino with dual sim?

I haven't done it, but it should not be a problem. The typical SIM board has jumper to use software serial or hardware serial. Therefore you should be able to simply stack two differently-configured shields. If you were desperate enough you could continue the saga with more shields
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Denmark
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Have a look at this circuit, if it works with a SD-card, it will work with a SIM too.
http://hackaday.com/2014/06/08/the-in-circuit-sd-card-switch/

Simply, power down the GSM modem, switch the card and power it on again.

If the GSM modem has a pin for signaling "Sim-card-holder open" you could use that too, signaling the GSM modem that the card was removed and re-inserted, without powering down the modem.

// Per.
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Have a look at this circuit, if it works with a SD-card, it will work with a SIM too.
http://hackaday.com/2014/06/08/the-in-circuit-sd-card-switch/

Simply, power down the GSM modem, switch the card and power it on again.

If the GSM modem has a pin for signaling "Sim-card-holder open" you could use that too, signaling the GSM modem that the card was removed and re-inserted, without powering down the modem.

// Per.

Thank you. I will look into that. Think it is what i am looking for.
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