SIM808 with Arduino Mega

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mastablasta
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SIM808 with Arduino Mega

Post by mastablasta » Tue Nov 13, 2018 4:18 am

Hello everyone.
I am running the SIM808 with Arduino Mega.
Using AT+ECHARGE=1 to enable and AT&W to store charging a LiPo for backup.
Doing AT+CBC always returns 0 for the first number, which means the LiPo is NOT charging.
Checking AT+ECHARGE? returns 1.
Shouldn´t AT+CBC return 1 in the beginning as well?
Input power is 12v 2a and LiPo is 3,7v 1500mAh.
The module is working fine with only 12v and working fine only with LiPo. The LiPo is just not charging.
Thanks for any help.
Kind Regards,
Jens

bill.yu
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Re: SIM808 with Arduino Mega

Post by bill.yu » Wed Nov 14, 2018 4:49 pm

Hi Jens,

please take a picture about the hardware connection. thanks.

mastablasta
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Re: SIM808 with Arduino Mega

Post by mastablasta » Wed Nov 14, 2018 11:05 pm

Hello bill.yu
This is my hook up:
https://photos.app.goo.gl/zEw8oKWr9BVBh2UQ9
Thanks

bill.yu
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Posts: 400
Joined: Mon Apr 02, 2018 11:05 am

Re: SIM808 with Arduino Mega

Post by bill.yu » Thu Nov 15, 2018 11:59 am

Hi Jens

I do not have the module, please try below steps. thanks.

1. Please try List of supported responses, AT+CBC=?
2. then wait for 1 sec,
3. then query the current setting AT+CBC

mastablasta
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Joined: Tue Nov 13, 2018 4:15 am

Re: SIM808 with Arduino Mega

Post by mastablasta » Thu Nov 15, 2018 5:06 pm

Hello bill.yu

this is the result:

at+cbc=?
+CBC: (0-2),(1-100),(voltage)
OK

at+cbc
+CBC: 0,78,4027
OK

*************** checking if charging is turned on *****************

at+echarge?
+ECHARGE: 1
OK

************** using a different LiPo **********************
at+cbc
+CBC: 0,68,3950
OK

The procentage and the voltage is displayed correct. The charging index (fist value) always remains at 0.
I have 2 of these modules and both doing the same. Also tried Aduino UNO, Mega, Nano...... no difference.
Baud rate was changed also.

Kind Regards, Jens

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