[minima] Re: Saving arduino lines
- From: Sunil Thomas Thonikuzhiyil <vu2swx@xxxxxxxxx>
- To: minima@xxxxxxxxxxxxx
- Date: Tue, 25 Feb 2014 01:04:27 +0530
Farhan,
We can even think of two extra pads on the i2c lines of the digital
board. and leave the digital board design as it is. If any one wants to
free up lines they can use the current lcd lines and wire an I2c module.
The software needs only a slight change.
Most of the I2c LCD adapter are based on
PCF8574
<http://www.nxp.com/documents/data_sheet/PCF8574.pdf>
I think these adapters are widely available on ebay.com. I find one listing
even on ebay.in for Rs 250.
Sunil
On Tue, Feb 25, 2014 at 12:34 AM, hcker2000 <hcker2000@xxxxxxxxx> wrote:
> I am new but the I2C lcd seems like a great option to free up some lines.
> The other option might be a shift register.
>
>
> On Mon, Feb 24, 2014 at 1:59 PM, <farhanbox@xxxxxxxxx> wrote:
>
>> Sunil,
>>
>> The I2C boards are not uniformly available everywhere. The only boards
>> available are the 16x2 lcd boards, they have a consistent interface and a
>> stable arduni library
>> - f
>> Sent from BlackBerry® on Airtel
>> ------------------------------
>> *From: * Sunil Thomas Thonikuzhiyil <vu2swx@xxxxxxxxx>
>> *Sender: * minima-bounce@xxxxxxxxxxxxx
>> *Date: *Tue, 25 Feb 2014 00:23:24 +0530
>> *To: *<minima@xxxxxxxxxxxxx>
>> *ReplyTo: * minima@xxxxxxxxxxxxx
>> *Subject: *[minima] Saving arduino lines
>>
>> Dear Farhan,
>>
>> The present design of digital board uses 6 Arduino lines for LCD
>> alone.
>> Why don't we use an I2c LCD instead. They are very cheap and the code
>> needs only two line change. I2C lines can be shared with Si570. In effect
>> we will save 6 lines. That will be enough for all future expansions.
>>
>> I am presently using this i2c adapter for all my arduino projects.
>>
>> http://www.aliexpress.com/item/Free-Shipping-New-5V-IIC-I2C-Serial-Interface-Board-Module-For-Arduino-1602-LCD-Display/1080407434.html
>>
>> I got PCB from Sandeep today. I will start building over next
>> weekend. and will post the progress.
>>
>> Sunil ,VU2SWX
>> PhD Scholar
>> Vision and Image processing Lab
>> Dept. of Electrical Engg
>> IIT BOMBAY,India
>>
>> --
>>
>>
>
>
>
> --
> Mike "hcker2000" Ashcraft
> http://bigironinteractive.com
>
> <http://www.linkedin.com/in/mikeashcraft>
>
--
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