Hi, I'm new to these forums and I am currently working on a project where I am converting an old rotary telephone to a mobile phone through the use of a GSM shield. I would like to interface an LCD screen to the Arduino UNO to print the number that is being called. My issue is the GSM shield uses the SCL and SDA ports already and although both components work as intended separately, the GSM shield interferes when I try to use the LCD screen at the same time. Does anyone have a suggestion for a workaround?
I have two Arduino UNO boards available to my disposal. What I was thinking was using each UNO for a separate function (One to print the number and the other to send the call via GSM). This seems overly complicated though and I was wondering if you guys had any thoughts about how I could get this LCD to work in conjunction with the GSM shield.
Any help is appreciated :) I'll slowly become more active as today is the first time I have even browsed through this forum. My apologies if this isn't the correct section to post such a question in (in that case please redirect me :D)
Edit: The LCD is a 1602A V2.0 with a control board already soldered to it. The outputs on the control board are simply GND VCC SDA and SCL.
Link to GSM shield : http://www.geeetech.com/wiki/index.php/Arduino_GPRS_Shield