Hi
I have been asked to create a simple "emergency" phone. I have been looking at all kinds of products to put this together. Both for arduino and raspberry pi (or other sbc).
Now that the MRKGSM1400 has launched I see that the library contains something about making voice calls, but what about actually transmitting voice from a microphone and playing back incoming voice via a speaker? Is this possible with this board?
I see that the SARAU201 has some pins for audio as "4-wire I2S digital audio interface" can the MCU use that or do I need extra hardware or is it not possible at all with this arduino?
Any suggestions are welcome
If I can use the MKRGSM1400 does it always require a battery to use the GSM modem? What if I supply it with from a very beefy psu on VIN?
I wonder the same thing. Are there anyone in this forum who knows how MKR1400 works regarding speech/voice and knows if it is possible to have actual voiceCall for both sending/receiving?
Looking at the schematic (https://content.arduino.cc/assets/MKRGSM1400-schematic.pdf), the modem has the i2s receive pin connected but not the i2s transmit pin. So the modem has the capability, but it was never wired up to the processor?
I'll admit, I'm a bit bummed this fact wasn't on the product page. I'm doing a rotary phone conversion, and would have selected a different board.
mzocher:
Looking at the schematic (https://content.arduino.cc/assets/MKRGSM1400-schematic.pdf), the modem has the i2s receive pin connected but not the i2s transmit pin. So the modem has the capability, but it was never wired up to the processor?
I'll admit, I'm a bit bummed this fact wasn't on the product page. I'm doing a rotary phone conversion, and would have selected a different board.
I am now trying to do a rotary phone conversion with and for my daughter and had the MKR GSM1400 in mind. I am glad I found this thread, but a bit disappointed that the MKR GSM does not cut it. I want the small form factor for our project. How did you solve this issue? Did they enable the possibility to receive calls in later revisions of the board? If not, is there another make that does provide a microcontroller for sending and receiving audio?
Hi,
Pense que podia realizar llamadas y meti la pata comprando dos (2) tarjetas MKR 1400
Que molesto estoy y descepcionado, ya que en las librerias parecia poder establecer un enlace de voz....
Yes, it is possible. It cost me a day to find out how...I would like to use my donated time for the forum:
The trick is to establish a I2S (not I2C) connection between the SAMD and a I2C device (a microphone). Now the modem has to link into this connection, read the data and send the I2S data as voice.
switch (vcs.getvoiceCallStatus()) {
case IDLE_CALL: // Nothing is happening
break;
case RECEIVINGCALL: // Yes! Someone is calling us
Serial.println("RECEIVING CALL");
// Retrieve the calling number
vcs.retrieveCallingNumber(numtel, 20);
// Print the calling number
Serial.print("Number:");
Serial.println(numtel);
// Answer the call, establish the call
vcs.answerCall();
break;
case TALKING: // In this case the call would be established
Serial.println("TALKING");
while (vcs.getvoiceCallStatus() == TALKING)
{
I2S.read(); // THIS LINE IS IT. THATS ALL, FOLKS!
}
vcs.hangCall();
break;
}