This happens only when i have connected the Antenna to the module
When the antenna is out the module works fine without restarting (i havent test it to send AT comands but i am guessing it will not be able to find the gsm network
Youre not giving it enough power. Those board supplies are typically 5-700ma
Id imagine without the ant, the device fails to see a network. When you add the ant it sees the network and attempts registration...which ups the power requirement as the tx stage fires up.
i am using the same module, and have the same problem like mr caslor. from my experience in this sim800l v2.2 module, it is not problem with power supply, because i am using laboratory power supply that can provide more than 2A. I did test 3 sim cards, and all 3 of them behave differently. i tested 2 sim cards of same network operator but 1 was newer and micro type, and another was nano with adapter. when i was using micro sim card from that operator, one led that continuously lighted and another was lighted 8 times and then module was reset. sim card from another operator: one led was lighted continuously and another was lighted 10 times and then reset.
the older sim card from 1st operator - micro sim card was around 4 years old. with that card i have no reset but also no connection to mobile network.
it is not problem with power supply, because i am using laboratory power supply that can provide more than 2A
It is not guarantee you are supplying GSM module the right way. sim800l needs power supply voltage 3.4-4.4V recommended 4V. Burst may produce problems because i can pull up to 2A current and if you have long wires it may produce voltage drop across it and GSM module will reset. It is good practice to solder electrolytic capacitor as close to the module as possible. I use 1000uF 6.3V cap and it helps. It is better to use a couple of lower capacity low ESR type capacitors.
mr bole, thank you for your answer very much!
i find a problem. and i believe that your solution with capacitor of 1000mf close to connector on module would solve the problem as well. the problem was wire that i was using to connect sim800l. i was using this type of wires http://www.5thpostulate.com/image-smp/5pe-male-female-jumper-wires-dupont-arduino-cables-8-cm-pack-of-10-dupont-arduino-jumpers_78503_1000x1000.jpg
i believe that this type of wires is very tiny to provide enough current in the moment that module is starting to send/receive gsm signal.
only thing i did, i put this type of connector
and connect female one directly to sim800l module.
i am using:
my
Work voltage: 3.7~5V
few minutes ago, i make a first call to the module from my cell phone... can you imagine how i was happy when i saw a massage RING on terminal
Hey guys,
I had the same problem on sim800c
and increasing voltage to 4.1 volts fixed the problem
on 4.00 volts it power's down after about 10 seconds blinking of net led
I had the same problem but I solved it by replacing the tantalum capacitor on the SIM800L EVB. On my board was 107, which is 100uF, I changed it to 108, which is 1000uF. I made the exchange on all five modules I've bought on aliexpress and have been working since then.
cz-themax:
I had the same problem but I solved it by replacing the tantalum capacitor on the SIM800L EVB. On my board was 107, which is 100uF, I changed it to 108, which is 1000uF. I made the exchange on all five modules I've bought on aliexpress and have been working since then.
This is interesting solution. Where did you found 108 tantalum capacitor? I found that they cost about same as whole board from aliexpress
Adding 1000uF 6.3v Aluminium Electrolytic capacitor causes sparks when I connect the DC power supply. How can I solve this issue? I guess the sparks destroyed the SIM800L.
I'm having exactly the same issue as described above with sim800L red module.
Attached is the schematics.
I have tried few modules and always the same result.
10-12 blinks and module resets itself
AT communication works fine.
LM is set to provide 4.2V and after diode i have 3.7V
I am using 5A power supply.
i have tried adding 2x470uF caps before modules but still no change.
EDIT:
After fiddling around i found that sim800's are very sensitive to the cable quality on power line.
So i replaced vcc and gnd connection cables on breadboard with good quality cable from power supply, suddenly all my problems are gone and sim800 works just fine and as expected.
cz-themax:
I had the same problem but I solved it by replacing the tantalum capacitor on the SIM800L EVB. On my board was 107, which is 100uF, I changed it to 108, which is 1000uF. I made the exchange on all five modules I've bought on aliexpress and have been working since then.
Hello,
I would like to know where you find the capacitor 107.
