SIM800L GPRS GSM ( ROHS ) restarts every 10 seconds

hi
i experiencing above problem module




i using arduino mega 2560 1 and  including  softwareserial.h  declare pins  10 , 11  as  rx , tx in code

my pin connections module

sim800 5v/4v ↔ arduino 5v  (or external power through mb102 breadboard power supply module 3.3v/5v arduino breadboard.. 1 below  )




sim800 gnd (first one) ↔ arduino gnd
sim800 sim_txd ↔ arduino d10 tx
sim800 sim_rxd ↔ arduino d11 rx
sim800 gnd (second one) ↔ arduino gnd common reference tx,rx

with sim card in place  , through serial monitor  can send  @ comands , receive messages

sending  at    , get   :

ok
+cpin: ready
call ready
sms ready


sending  at+cfun?    , get   :


+cfun: 1



sending  at+creg?    , get   :


+creg: 0,2

 

sending  at+cops?    , get   :


+cops: 0


sending  at+cmgf=1    , get   :


ok




sending  at+csmp?    , get   :


+csmp: 17,167,0,0




but of these commands can send them between 10 seconds takes before  restarts again


the module has 2 leds... 1 red on in these 10 seconds  , second one  red in colour blinking


when dont have sim card inside slot  module doesn't restart , on   with 2 leds working describe above



any 1 same problem , perhaps solution this? doing wrong ?

ok find out strange....

this happens when have connected antenna module

when antenna out  module works fine without restarting  (i havent test send @ comands guessing not able find gsm network






so idea ?

thanks in advance

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > SIM800L GPRS GSM ( ROHS ) restarts every 10 seconds

arduino