2.2 Touchscreen module @ 24.99 interesting?
Oldbitcollector (Jeff)
Posts: 8,091
I'm working on a prototype of a 2.2 Touchscreen module for Quickstart.
The final price would be around $24.99. Is this interesting to a few people here?
(Trying to get an idea of I should bulk order.)
Jeff
The final price would be around $24.99. Is this interesting to a few people here?
(Trying to get an idea of I should bulk order.)
Jeff
Comments
What would be screen resolution? I am most concerned with how many 8x8 characters will fit on the screen.
I usually want at least 100 characters per line, so 800x600 is the lowest I can go.
I'll bring in a bunch of the touchscreens and stock them initially as an independent item, to be followed by a Quickstart module for them.
Jeff
I've had trouble to committing on LCDs mainly because the unit cost is usually too high. The 1.5" LCDs from Varitronix were great because they were only about $4 each quantity 10 - they are now obsolete. The 1.8" LCDs I'm using now are about $11 each quantity 10 - they are not a drop-in replacement though.
I guess what I'm trying to say is that consistency of supply is just horrible in the smaller LCD market. Of course many people in the hobby area may not care much if the same LCD is not available long term.
The value to add in my opinion is a carrier board with a consistent pin-out so that the actual LCD connector doesn't matter. That is, a new carrier board can be designed as needed.
The hardest part for me so far is being motivated to rewriting the LCD device driver for the replacement parts.
Just my 0.02
--Steve
I hear you loud and clear.. It'll be a challenge to stock LCDs for sure.
Jeff
The 3 sets of male headers are not aligned though, so won't fit onto stripboard (Doh!) - although if you ignore the SDcard pins the rest will sort-of-fit.
The parallel interface (8 bit) only allows writes, not reads, because of the on-board 74HC245's are hardwired one-way (Doh!) - still its not very important
to be able to read as each pixel is individually addressed.
It takes 5V power, has on-board 3V3 which is used for all logic signals. ILI9325 driver (has framebuffer, no waitvid needed), touchscreen chip is XPT2046 (digitizes X,Y and Z to SPI), SDcard (separately pinned).
Something that addresses the downsides of this module, has continuity of supply, and pinout was better arranged and if 74AC245's were used to allow 3.3 and 5V signals, that would be worth paying more for...
In fact I'd suggest for a module with ILI9325 or similar framebuffer driver, then support for both SPI and 8-bit parallel would be really nice to have.