Arduino 4-20mA shield pinout

Questions about the Waspmote v15 and its modules
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morrisman68
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Joined: Sun Oct 06, 2019 7:07 pm
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Arduino 4-20mA shield pinout

Post by morrisman68 » Mon Oct 07, 2019 10:04 am

I recently purchased such a shield and cannot find a pinout for it - I need to interface other devices as well, and would like to know what has been tied up by the shield and what is left usable.

Many thanks!

libelium-dev
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Joined: Mon Sep 28, 2009 1:06 pm

Re: Arduino 4-20mA shield pinout

Post by libelium-dev » Tue Oct 08, 2019 11:19 am

Hi,

In the next image you can see the pins of the board that are routed, we're sorry but we can't share more about the board. Hope this help.

Image

Regards

morrisman68
Posts: 5
Joined: Sun Oct 06, 2019 7:07 pm
Company: Retired

Re: Arduino 4-20mA shield pinout

Post by morrisman68 » Wed Oct 09, 2019 12:21 am

Thank you very much for this.

My application requires an RTC board besides the 4-20mA interface, along with about 16 digital I/O pins, some of which will have to be connected via an I2C GPIO expansion card. As you can imagine, I shall need to know which GPIO pins are used by each shield in order to make progress.

So my question is this, I suppose: which GPIO pins are used exclusively by your shield, and which are untouched, and hence free for me to use?

Many thanks,

Ben

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: Arduino 4-20mA shield pinout

Post by libelium-dev » Wed Oct 09, 2019 8:40 am

Hi,

In the image we posted you can see the pins of the 4-20 board that are routed, that pins are the pins used by the board, the other pins are untouched.

Regards

morrisman68
Posts: 5
Joined: Sun Oct 06, 2019 7:07 pm
Company: Retired

Re: Arduino 4-20mA shield pinout

Post by morrisman68 » Wed Oct 09, 2019 9:32 pm

Thank you for giving me an exercise in pattern-matching your diagram against an Arduino pinout just to allow me to work out that I need to avoid:

D5
A0, A1, A4, A5

Being retired I have time to solve such puzzles. Were I still employed I would not - would it have been too much trouble just to list them?

I am not impressed.

Ben

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: Arduino 4-20mA shield pinout

Post by libelium-dev » Thu Oct 10, 2019 8:26 am

Hi Ben,

Apologize for the inconveniences.

Regards

morrisman68
Posts: 5
Joined: Sun Oct 06, 2019 7:07 pm
Company: Retired

Re: Arduino 4-20mA shield pinout

Post by morrisman68 » Thu Oct 10, 2019 6:00 pm

Am I correct in thinking that SCL/SDA are not carried through the shield, nor +5V?

This must mean that an application which requires to make use of these cannot include your board, as there will be no access to them.

If I am missing something obvious then I apologise and would gladly be told!

Many thanks,

Ben

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: Arduino 4-20mA shield pinout

Post by libelium-dev » Fri Oct 11, 2019 9:42 am

Hi,

The SCL and SDA pins are used by the a-20mA board, so if you connect a device to those pins, it could cause interference.

Regards

morrisman68
Posts: 5
Joined: Sun Oct 06, 2019 7:07 pm
Company: Retired

Re: Arduino 4-20mA shield pinout

Post by morrisman68 » Fri Oct 11, 2019 4:22 pm

I understand the I2C bus to imply an addressing scheme so that multiple devices can be daisy-chained and selected via their address. So the design of your board precludes any further expansion of the associated Arduino, as I see it.

If this is the case then I suggest you need to make it clear in your documentation. I shall seek to return mine against a refund as it is not fit for purpose in my application.

Thank you,

Ben

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: Arduino 4-20mA shield pinout

Post by libelium-dev » Mon Oct 14, 2019 9:23 am

Hi Ben,

Apologies for the inconvenience. We developed the board to be used with Arduino and without other boards connected to.

Regards

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