I'm having a hard time fixing my SIM808 it's not working, I've been trying to fix this and make it send the google map link through SMS, however after trying to run it, it's only saying "SIM808 init error" through serial monitor.
bit-bash serial software on the UNO such as SoftwareSerial and AltSoftSerial typically have problems working at baudrates higher than 38400baud
do you have any idea what the default baudrate of the SIM 808 is? or can it autobaud?
looking at SIM808_V2.2.5_user_manual_V1.0.pdf 9600 appears to be default
what pins are you using on the UNO to connect too the SIM808?
can you give a diagram showing the connections?
the UNO can give sufficient power to run basic AT commands but when the device communicates (can take 2amps) you will require an external power supply