unstable SIM800L EVB

[erloppy]

Hello I am testing test code with an arduino mega2560 and a module gsm SIM800L EVB, but the result is very unstable, sometimes it gets many connections and sometimes it does not, it stops or it gives me connection error continuously.

These doing a project that consists of sending samples from a sensor to a bbdd and I thought that the SIM800L module was a good idea, but I have doubts, is anyone having these problems?

Thank you.

And thanks for the library.

[mbenitez01]

I managed to send 100 urls contianing "sensor information" to my remote server... 100 GET request..one each 15 seconds... all returned 200 (success)....after that, I decided to to a more real scenario and changed inteval to 15 MINUTES...left the process running and went to bed..... I gess my pc run into hibernation satus, and the process stooped suddenly..... when I woke in the mornig...I HAVE NEVER..NEVER..NEVER been able to send a GET again..not a single one!! wrote to SimCom enigineers who basically told me the 800L is a piece of crap...they strongly discouraged me to use it in production...they said this was a cheap toy just for test in the china market......so ..if their engineers talk like this.... we should better forget this module, I guess...

[bkkrunal]

Hi @mbenitez01 Your comment on SIM800L makes me worry. I have used SIM800C in production and now I am worried if its the same case with SIM800C. Did yo find any other better option for industrial standard GSM modules?

Thanks in advance.

[mbenitez01]

Hi..

For all I have read about SIM800x, I came to the conclusion that 800L is some kind of defective brother of the family...and the manufacturer decided to leave that 'child' only for domestic use, where they surely would avoid demands. Also, this problem caused module price drop to near zero. However, this extremelly low price was seen by unscrupulous marketers as an excelent oportunity to make huge economic difference and despite the module flaws, decided to market it all around the world.

The healtly brothers, (800C, 800H and 800) work fine as a far as I know.

Good luck with your development..may yoy please keep me updated how it goes? (btw..do you send gets/posts, or just plain sms?)

regards

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Tue, Mar 21, 2017 at 1:48 PM, bkkrunal notifications@github.com wrote:

Hi @mbenitez01 https://github.com/mbenitez01 Your comment on SIM800L makes me worry. I have used SIM800 (not SIM80L) in production and now I am worried if its the same case with SIM800. Did yo find any other better option for industrial standard GSM modules?

Thanks in advance.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/stanleyhuangyc/Freematics/issues/26#issuecomment-288142164, or mute the thread https://github.com/notifications/unsubscribe-auth/ACptRevjOEqZLYwJySqJoqAgDKVy9n5cks5rn_9agaJpZM4LfY2u .

[mbenitez01]

I have not found a 'champ'..right now I have started testing of al.thinker A7 (extrmely poor) and n old SIM340... I have to solder components on a quectel m95..but at this point I'm kind of dissapointed to start new development..

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Tue, Mar 21, 2017 at 4:52 PM, marcelo benitez mbenitez01@gmail.com wrote:

Hi..

For all I have read about SIM800x, I came to the conclusion that 800L is some kind of defective brother of the family...and the manufacturer decided to leave that 'child' only for domestic use, where they surely would avoid demands. Also, this problem caused module price drop to near zero. However, this extremelly low price was seen by unscrupulous marketers as an excelent oportunity to make huge economic difference and despite the module flaws, decided to market it all around the world.

The healtly brothers, (800C, 800H and 800) work fine as a far as I know.

Good luck with your development..may yoy please keep me updated how it goes? (btw..do you send gets/posts, or just plain sms?)

regards

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Tue, Mar 21, 2017 at 1:48 PM, bkkrunal notifications@github.com wrote:

Hi @mbenitez01 https://github.com/mbenitez01 Your comment on SIM800L makes me worry. I have used SIM800 (not SIM80L) in production and now I am worried if its the same case with SIM800. Did yo find any other better option for industrial standard GSM modules?

Thanks in advance.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/stanleyhuangyc/Freematics/issues/26#issuecomment-288142164, or mute the thread https://github.com/notifications/unsubscribe-auth/ACptRevjOEqZLYwJySqJoqAgDKVy9n5cks5rn_9agaJpZM4LfY2u .

[bkkrunal]

Hi,

Thank You very much for the reply. So that is the reason for why SIM800L can not be officially seen on their website.

I have been developing with SIM800C from last month and making GET/POST requests. The main problem I am facing now is that if I don't make any request for more than 10-15 minutes, the module will stop working. I am trying to reset the module programatically when it happens but still can't re-establish communication. The module starts working with the whole system reset so I am trying to figure out if its module problem or a bug in the code.

I would love to keep you updated on the same.

Thanks again for your help & good wishes.

Krunal bkkrunal2411@gmail.com krunal.bhongade (skype)

[mbenitez01]

Yes..I have faced that problem...what you can do is execute an ATI, or AT+COPS=? or even a plain AT..to keep module alive.....to maintain connection, you can execute AT+CIPPING...or AT+SAPBR=2,1....

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Wed, Mar 22, 2017 at 1:18 AM, bkkrunal notifications@github.com wrote:

Hi,

Thank You very much for the reply. So that is the reason for why SIM800L can not be officially seen on their website.

I have been developing with SIM800C from last month and making GET/POST requests. The main problem I am facing now is that if I don't make any request for more than 10-15 minutes, the module will stop working. I am trying to reset the module programatically when it happens but still can't re-establish communication. The module starts working with the whole system reset so I am trying to figure out if its module problem or a bug in the code.

I would love to keep you updated on the same.

Thanks again for your help & good wishes.

Krunal bkkrunal2411@gmail.com krunal.bhongade (skype)

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/stanleyhuangyc/Freematics/issues/26#issuecomment-288294474, or mute the thread https://github.com/notifications/unsubscribe-auth/ACptRUa7sbY3A8k9TZO_IYpO0QzOIaGaks5roKEFgaJpZM4LfY2u .

[erloppy]

Hello, it is very interesting that you comment.

I am developing a device that writes values from a sensor in a bbdd using an 800L and I am having many stability problems.

The reason for using the 800L is by price and by energy consumption, my device will be powered by batteries and I want it to last two years and this is very complicated with the current GSM modules because they consume a lot, and the 800L has a great consumption .

Do you know of any other GSM module that has consumption similar to 800L and is more stable ?.

Thank you.

[mbenitez01]

I'm very dissapointed with 3 or 4 modules I have tested so far.....

I bought an AI-thinker A7 a couple of months ago....I started to test it two weeks ago and I have to say this is barely more than a stone....I was not able to connect to the GPRS network...! But I have to give credit to the AI-thinker guys...after all, they are the parents of 8266 monster..and their plan is to upgrade firmware to A7..so you can 'drop' a LUA on it.... they do not provide an estimated date..hopefuly it happens during 2017..at that point I guess we'll have an stable gsm module.

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Wed, Mar 22, 2017 at 1:38 PM, Daniel notifications@github.com wrote:

Hello, it is very interesting that you comment.

I am developing a device that writes values from a sensor in a bbdd using an 800L and I am having many stability problems.

The reason for using the 800L is by price and by energy consumption, my device will be powered by batteries and I want it to last two years and this is very complicated with the current GSM modules because they consume a lot, and the 800L has a great consumption .

Do you know of any other GSM module that has consumption similar to 800L and is more stable ?.

Thank you.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/stanleyhuangyc/Freematics/issues/26#issuecomment-288459860, or mute the thread https://github.com/notifications/unsubscribe-auth/ACptRTRnBOiBL12GbsvCw-gX9SNgwcXjks5roU5vgaJpZM4LfY2u .

[bkkrunal]

Hi @mbenitez01, Thanks for the suggestions.

I tried to execute AT instructions after every minute but still the same problem. But, now I have found a work around that I am making dummy GET request every once in 2 minutes, and now its been working good. Now, the only problem I see that I haven't yet found any way to reset the module programatically.

@erloppy, SIM800L is as equal as SIM800C in cost but I am not sure about power consumption.

I will update my test results here.

Thanks.

[mbenitez01]

you left me thinking with your email... and I'm afraid I have bad news for you... any RF transceiver (434Mhz, 900Mhz, BT, 2,4G , wifi....you name it) needs aprox 100 mA during transmition...(some use 70 or 80 milliamps, but it's no big difference)

now...each time the module has to transmit, it takes aprox 30 seconds (half a minute) to complete the cycle...

some maths:

TXburstenergy=100 mA* 1/120 h (1/120h is 30 seconds)

TXburstenergy=1mAh (aprox)

now.....if you transmit once a minute, you will need 1440 mAh per day (in one day you have 1440 minutes=60x24)

so..let's supouse you have a batery pack yielding 5000mAh....this will give you energy just for 3,5 days!

(5000/1440= 3,5 aprox)

Let´s say I exaggerated with my numbers....let's change TX period to one each 15 minutes.....

That gives a batery autonomy of 50 days aprox (3,5x15)

Once again, if you want to halve power consume...fianlly you'll get 100 days being very optimistic...

I guess a solar panel will be a good solution....

Hopefuly this helps.

Marcelo Benitez 15-3660-0730 4661-9462 pedromarcelobenitez(skype) soluciones.16mb.com

On Wed, Mar 22, 2017 at 1:38 PM, Daniel notifications@github.com wrote:

Hello, it is very interesting that you comment.

I am developing a device that writes values from a sensor in a bbdd using an 800L and I am having many stability problems.

The reason for using the 800L is by price and by energy consumption, my device will be powered by batteries and I want it to last two years and this is very complicated with the current GSM modules because they consume a lot, and the 800L has a great consumption .

Do you know of any other GSM module that has consumption similar to 800L and is more stable ?.

Thank you.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/stanleyhuangyc/Freematics/issues/26#issuecomment-288459860, or mute the thread https://github.com/notifications/unsubscribe-auth/ACptRTRnBOiBL12GbsvCw-gX9SNgwcXjks5roU5vgaJpZM4LfY2u .