This post is intended to help beginners interfacing SIM800 GSM Modem to Arduino. Power supply requirement: The power supply to the board should be 12v, 1-2A.The SIM800 modem described in this link has both RS232 and TTL type inputs. Make sure that the two pins labeled as power key are shorted, it is required for the modem. I am confused about how to connect SIM800 GSM module to RaspBerry PI 3. When the connection is lost. Persist # Do not ask the remote to authenticate. Noauth # No hardware flow control on the serial link with GSM Modem nocrtscts # No modem control lines with GSM Modem local.com and it takes a good 30 seconds to load.
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/* Band Management This sketch, for the MKR GSM 1400 board, checks the band currently configured in the modem and allows you to change it. Please check http://www.worldtimezone.com/gsm.html Usual configurations: Europe, Africa, Middle East: E-GSM(900)+DCS(1800) USA, Canada, South America: GSM(850)+PCS(1900) Mexico: PCS(1900) Brazil: GSM(850)+E-GSM(900)+DCS(1800)+PCS(1900) Circuit: * MKR GSM 1400 board * Antenna created 12 June 2012 by Javier Zorzano, Scott Fitzgerald */ // libraries #include <MKRGSM.h> // initialize the library instance GSMBand band; voidsetup(){ // initialize serial communications and wait for port to open: Serial.begin(9600); while(!Serial){ ;// wait for serial port to connect. Needed for Leonardo only } // Beginning the band manager restarts the modem Serial.println('Restarting modem...'); band.begin(); Serial.println('Modem restarted.'); }; voidloop(){ // Get current band String bandName = band.getBand();// Get and print band name Serial.print('Current band:'); Serial.println(bandName); Serial.println('Want to change the band you’re on?'); String newBandName; newBandName = askUser(); // Tell the user what we are about to do… Serial.print('nConfiguring band '); Serial.println(newBandName); // Change the band bool operationSuccess; operationSuccess = band.setBand(newBandName); // Tell the user if the operation was OK if(operationSuccess){ Serial.println('Success'); }else{ Serial.println('Error while changing band'); } if(operationSuccess){ while(true); } } // This function offers the user different options // through the Serial interface // The user selects one String askUser(){ String newBand; Serial.println('Select band:'); // Print the different options Serial.println('1 : E-GSM(900)'); Serial.println('2 : DCS(1800)'); Serial.println('3 : PCS(1900)'); Serial.println('4 : E-GSM(900)+DCS(1800) ex: Europe'); Serial.println('5 : GSM(850)+PCS(1900) Ex: USA, South Am.'); Serial.println('6 : GSM800(800)+GSM(850)+E-GSM(900)+PCS(1900)'); Serial.println('7 : UMTS(2100)'); Serial.println('8 : GSM(850)+E-GSM(900)+PCS(1900)+UMTS(2100)'); // Empty the incoming buffer while(Serial.available()){ Serial.read(); } // Wait for an answer, just look at the first character while(!Serial.available()); char c =Serial.read(); if(c '1'){ newBand = GSM_MODE_EGSM; }elseif(c '2'){ newBand = GSM_MODE_DCS; }elseif(c '3'){ newBand = GSM_MODE_PCS; }elseif(c '4'){ newBand = GSM_MODE_EGSM_DCS; }elseif(c '5'){ newBand = GSM_MODE_GSM850_PCS; }elseif(c '6'){ newBand = GSM_MODE_GSM850_EGSM_DCS_PCS; }elseif(c '7'){ newBand = GSM_MODE_UMTS; }elseif(c '8'){ newBand = GSM_MODE_GSM850_EGSM_PCS_UMTS; }else{ newBand ='GSM_MODE_UNDEFINED'; } return newBand; } ![]() Comments are closed.
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December 2022
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