[Ilugc] [Commercial] Linux box status with 2 line LCD
- From: mohan.tux@xxxxxxxxx (Mohan Sundaram)
- Date: Sat, 19 Nov 2011 20:43:01 +0530
On Sat, Nov 19, 2011 at 7:18 PM, Arun Venkataswamy <arun289 at gmail.com> wrote:
On Sat, Nov 19, 2011 at 5:48 PM, Mohan Sundaram <mohan.tux at gmail.com>
wrote:
I work with LCD displays now. We can get displays at a price points of
under $10 for 20x2 and 16x2 displays. Most of these controllers come
with SPI and UART interfaces. Look up http://www.trulydisplays.com or
http:/www.everbouquet.co.tw.
I will take a look at these links.
The 16x2 lines are available here at ritchie street from Rs.150/- but these
are all parallel interface. No serial interface.
I'm building a PIC based product with a display that interfaces on
SPI. The LCD driver also takes parallel. It is quite likely these
displays in Ritchie street can be stripped off the parallel interface
chip and be interfaced to our microcontroller directly. USB to
parallel i/f chips are expensive as they are low volume products.
Since I'm building a consumer product, I'm getting prices that are way
below sample pricing. I'll try and get some good prices.
Some other indicative pricing - 1.6" square 128x128 pixel LCD @ 3.5
USD, 128x32 pixel LCD @ 5.5 USD etc are achievable.
We can use software character generators in uC instead of having a
character generator chip in the LCD driver thus bringing down the
price. I've found dedicated USB <=> serial/parallel devices to be more
expensive (almost twice) than uCs that have USB/SPI etc and enough
general purpose programmable I/O pins to implement a 7 - 14 bit
parallel interface.
We will need to implement the parallel port handshake and protocol in
software. We've done that for SPI (softSPI) which works well.
-- Mohan Sundaram
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