I have a GSM GPRS modul SIM800L.
Is it possible to connect two Arduino Board to parallel connection?
My tests say no…
- when I connect Arduino bord No1 to Modul, all is OK
- when I connect Arduino bord No2 to Modul, all is OK
- when I connect No1 and No2 parallel to modul, modul GSM does not communicate…
I am not sure why… Is my idea right?