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tonic over 8 years ago

I am trying to connect an Arduino Uno with an GSM/GPRS modem which will power up at an voltage supply of 24v, so if a communication is established between both there wont be any problem with voltage level right?

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gadget.iom over 8 years ago +1

In theory yes, but you may still have issues with a disparity between 5v and 3.3v logic. Which Arduino and GSM modules are you using?
mconners over 8 years ago +1

I think we need a little more info. Such as what it the make/model of the modem. What is the method of connection, etc... If the modem requires 24v to operate it may be because the interface is RS-232…
tonic over 8 years ago in reply to mconners +1

It is an Calixto-Telit GL86x GSM/GPRS modem.... The method of connection is Tx and Rx pins of Arduino uno are connected to receive and transmit pins of GSM modem through an MAX232 IC... Plz reply...

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gadget.iom over 8 years ago

In theory yes, but you may still have issues with a disparity between 5v and 3.3v logic. Which Arduino and GSM modules are you using?
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gadget.iom over 8 years ago

In theory yes, but you may still have issues with a disparity between 5v and 3.3v logic. Which Arduino and GSM modules are you using?
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