How will i know if there's a signal or not? (SIM800L)
The SIM800L module has one LED indicator for Power and Signal. The color of it is Green LED or some is Red in color. Once you plug in the power supply the LED indicator will blink every 1 sec. After 5 seconds or more the LED indicator must be blinking every 2seconds interval - that means you have a signal. Make sure it has an antenna connected.
Tags: SIM800L Shield