bug in GSM 2 click

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programmer5
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bug in GSM 2 click

#1 Post by programmer5 » 04 Apr 2014 07:53

GSM 2 click needs voltage signal on both 3.3V and 5V pins, this was a silly thing that wasted two months on debugging. i made my own custom PCB with two mikrobus sockets on it, and PIC18f25k22.
and I only connected voltage source at 3.3V pin of mikroBus, and left 5V open. GPS worked fine, and GSM failed, why not you mentioned on website that both 3.3v and 5v pins of mikrobus needs connection with power source instead of " Board can use either 3.3V or 5V power supply "
i'm now fed up with these silly bugs that you keep doing in your products.

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petar.timotijevic
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Re: bug in GSM 2 click

#2 Post by petar.timotijevic » 04 Apr 2014 14:27

programmer5 wrote:GSM 2 click needs voltage signal on both 3.3V and 5V pins, this was a silly thing that wasted two months on debugging. i made my own custom PCB with two mikrobus sockets on it, and PIC18f25k22.
and I only connected voltage source at 3.3V pin of mikroBus, and left 5V open. GPS worked fine, and GSM failed, why not you mentioned on website that both 3.3v and 5v pins of mikrobus needs connection with power source instead of " Board can use either 3.3V or 5V power supply "
i'm now fed up with these silly bugs that you keep doing in your products.
Hello,

Please check your custom PCB design. If possible post photo from both sides of PCB.
programmer5 wrote:GPS worked fine
GPS on GSM2 Click?


Circuit on page 2:
http://www.mikroe.com/downloads/get/195 ... manual.pdf

Please see J1 SMD jumper and voltage regulator MCP1826 input.

GSM2 click
http://www.mikroe.com/click/gsm2/

Image



Best regards,
Peter

programmer5
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Re: bug in GSM 2 click

#3 Post by programmer5 » 04 Apr 2014 16:39

petar.timotijevic wrote:GPS on GSM2 Click?

Peter
I actually purchased two click boards, one GSM and one GPS, along with easy PIC version 7.
do you think every click board will have its own special designed mikroBus??? isn't it possible that we can use any click board on it?

by the way, attached is schematic of mikroBus that i used in my PCB, i added two mikrobus sockets.
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petar.timotijevic
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Re: bug in GSM 2 click

#4 Post by petar.timotijevic » 05 Apr 2014 16:55

Hello,

All GPS Click and GSM Click boards can work on 3,3V, why to use 5V then and what is purpose of usage 3,3V and 5V on the same Click board?

Please see mikroBUS specification:
http://www.mikroe.com/downloads/get/173 ... cation.pdf

How you use 5V? In your block diagram you do not have 5V connection, among other this diagram do not show PCB design?


Best regards,
Peter

programmer5
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Re: bug in GSM 2 click

#5 Post by programmer5 » 08 Apr 2014 07:04

petar.timotijevic wrote: All GPS Click and GSM Click boards can work on 3,3V, why to use 5V then and what is purpose of usage 3,3V and 5V on the same Click board?
It is clear from MikroBus specifications that we can power up click board either with 5V or with 3.3V Image
As you can see from my schematic of MikroBus, there is only one source, i.e 3.3, and I left 5V open, both clicks were supposed to work fine, but GPS worked, GSM failed, later during testing, I connected GSM2 click with easyPICv7 board via jumper wires and left 5V pin of GSM open, and it failed, then I connected 5V source with 5V pin of GSM and 3.3V with 3.3V pin of GSM and it started working.
petar.timotijevic wrote: How you use 5V? In your block diagram you do not have 5V connection, among other this diagram do not show PCB design?
Peter
yes, I don't have 5V connection in my block diagram, that is why I said this bug wasted almost two months, If you had mentioned on GSM2 click board page that it needs power on both 3.3V and 5V pins, I would have added two power sources. Above schematic was sufficient for understanding my click board PCB, I don't want to disclose my complete PCB layout, here is screenshot of it that shows power and ground connections, these are actually two click boards, one on front side of PCB and other on backside of PCB. You can see, I connected only 3.3V pins of mikroBus with VCC, and left 5V open.

if you need complete circuit diagram, I can send you in private message.
thank you
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programmer5
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Re: bug in GSM 2 click

#6 Post by programmer5 » 14 Apr 2014 11:22

NO REPLY???? :(

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petar.timotijevic
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Re: bug in GSM 2 click

#7 Post by petar.timotijevic » 16 Apr 2014 04:41

Hello,

Yes, you are right.

Vgsm voltage is generated with U4 regulator from 5V.

We will fix this as soon as possible.
programmer5 wrote: if you need complete circuit diagram, I can send you in private message.
thank you
Yes, You can send me on my email petar.timotijevic@mikroe.com

Thank You,


Best regards,
Peter

Paul Akinde
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Re: bug in GSM 2 click

#8 Post by Paul Akinde » 07 May 2014 17:04

after following the trend of this post http://www.mikroe.com/forum/viewtopic.p ... 5v#p235935

I discovered from the datasheet, of the GSM Module M95 http://www.sos.sk/E396C6DD-B8D1-4BF3-87 ... D_V1.0.pdf that the VBAT has to be powered for the module to work and the power supply comes from Vgsm on the schematics of GSM2 CLICK.........

..................................................
Meanwhile, I also just got my board EASYPIC v7 and GSM2 CLICK.. but it didnt work when I powered it and follow your procedures...

I will like you to update the schematic and the connection of the GSM2 CLICK board on the microBUS for right and proper connections.

thank you Peter.

Paul
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from the datasheet of the Modem M95
from the datasheet of the Modem M95
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Paul Akinde
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Re: bug in GSM 2 click

#9 Post by Paul Akinde » 08 May 2014 12:38

After 24 hours of my last post. I manually wired 5V dc from the source to the 5V pin of the microBUS pin and re-programmed the board and it worked!...I have appended the picture as shown below.

thanks.
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petar.timotijevic
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Re: bug in GSM 2 click

#10 Post by petar.timotijevic » 09 May 2014 13:16

Hello,

@Paul,

Just for testing, turn Off development board, remove GSM2 Click from MikroBUS socket 1, then turn On board with USB power source and 3,3V jumper.

Measure voltage on MikroBUS socket 1 and 2 on pin +5V. On EasyPIC dev board you should have both 3,3V and 5V in MikroBUS.

Please send results for both sockets.

Also please see GSM2 Click User Manual document page 1:
GSM2 Click™ communicates with target board microcontroller via mikroBUS™ UART (Tx, Rx), PWM, INT, AN, RST and CS lines.
The board is designed to use 3.3V and 5V I/O voltage levels.
Best regards,
Peter

Paul Akinde
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Re: bug in GSM 2 click

#11 Post by Paul Akinde » 13 May 2014 09:09

Hi Petar,

I have done what you asked for. here are the result.

When I power off the EasyPIC board and I power them ON again.
I measured both the mikroBUS voltages 3.3V and 5.0V on a separate cases.

And the result I got was 3.41V for 3.3V pin, and 5.23V on the 5.0V pin.

Then I put back the GSM2 Click on the mikroBUS and now suprisingly it worked perfectly. I can call and send/receive SMS from the module.

what really caused the previous mis-function of the mikroBUS ?

Now the board works well with the GSM2 Click module

regards,

Paul
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petar.timotijevic
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Re: bug in GSM 2 click

#12 Post by petar.timotijevic » 13 May 2014 09:34

Hi,

That's exactly what I'm talking about.

When you use EasyPIC v7 development board GSM2 Click board receives both 3,3V and 5V voltages from MikroBUS socket and GSM2 Click board should works fine.

If you use GSM2 Click board as stand-alone board, you need to supply both voltages 3,3V and 5V to click board.

5V is needed for making ~4V for GSM Quectel M95 module. This module has minimum voltage of 3,3V which is problematic when GSM module starts communication.

If MikroBUS does not have 5V this can be a symptom of a board failure.


Best regards,
Peter

mohammed_aji
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Re: bug in GSM 2 click

#13 Post by mohammed_aji » 22 Jun 2014 16:32

Following this thread made me curious. I have GSM Click v1 which i am yet to test. Is that case the same with it. That is, one has to power it with both 5V and 3.3v?

Secondly, what is the minimum pins connection for the gsm click when connecting to a different board?

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petar.timotijevic
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Re: bug in GSM 2 click

#14 Post by petar.timotijevic » 23 Jun 2014 15:25

Hi,

@mohammed_aji

You can use 3,3V or 5V and you will need to supply only one voltage to GSM click board.

Please see board circuit:

GSM Click schematic
http://www.libstock.com/img/projects/21 ... m_clic.JPG

- 3,3V or 5V, 3,3V is default (Check and properly set SMD jumper J1, default is 3,3V),
- Gnd pin (Common ground with uC),
- TX pin to uC RX RC7 (Auxiliary UART - TX Data),
- RX pin to uC TX RC6 (Auxiliary UART - RX Data),
- CS is RTS, uC RE0
- RST is RST, uC RE1 for reset (Reset input),

Additional:
- PWM is GPIO2 GSM module pin (GPIO02 Configurable GPIO / Jammer Detect Report / Digital Audio Interface RX) this can be used in some other projects.
- AN is PWRMON, uC RA2 (2.8V stabilized output Imax=100mA / Power ON monitor),
- INT is CTS over 1K resistor to RB0 (Output for Clear to send signal)


If you want to use different uC pins you need to modify source code.

Please make sure that there is no pullup or pulldown resistors on Tx/Rx lines.


Best regards,
Peter

pourang
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Re: bug in GSM 2 click

#15 Post by pourang » 14 Dec 2017 06:23

OK, this GSM2 click is NOT a product. No documentation, no support, even pin functions must be guessed and found out by browsing thru forums. **** HW design. AVOID THIS PRODUCT!
After AT command the TXD line goes crazy and I see that many other users had the same problem. Most likely MikroElektronika saved a few cents by ommiting bypass capacitors and that's why the HW is so unstable. If you want a toy, go to toy store, dont buy this piece of ****.

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