I'm trying to find a display to use with a Pi that will be readable in
direct sunlight (on a boat).
I can find LCD numeric displays using the Hitachi HD44780 interface
and they work OK in the sun but I'm after a graphic display of some
sort. It needs to be a reasonable size, so all the 128 x 64 ones are
too small really. Something like a 7" display would be ideal.
Does anyone here know of anything like this that doesn't cost hundreds
of pounds?
I'm trying to find a display to use with a Pi that will be readable in
direct sunlight (on a boat).
I can find LCD numeric displays using the Hitachi HD44780 interface
and they work OK in the sun but I'm after a graphic display of some
sort. It needs to be a reasonable size, so all the 128 x 64 ones are
too small really. Something like a 7" display would be ideal.
Does anyone here know of anything like this that doesn't cost hundreds
of pounds?
On 29/07/2023 09:46, Chris Green wrote:
I'm trying to find a display to use with a Pi that will be readable in direct sunlight (on a boat).
I can find LCD numeric displays using the Hitachi HD44780 interface
and they work OK in the sun but I'm after a graphic display of some
sort. It needs to be a reasonable size, so all the 128 x 64 ones are
too small really. Something like a 7" display would be ideal.
Does anyone here know of anything like this that doesn't cost hundreds
of pounds?
Chris,
If an update rate of, say, 30 seconds is adequate, and a 74 mm diagonal is adequate, you could look at the Pimoroni Badger - 296 x 128 pixels. Available
plain, or with embedded wireless:
https://shop.pimoroni.com/products/badger-2040?variant=39752959852627
https://shop.pimoroni.com/products/badger-2040-w?variant=40514062188627
Using two lines of characters it's readable at 2m away. Program with Python -
many examples and help easily available.
No, sadly those E-Ink displays are too slow. I don't need really fast refresh but I do need to be able to refresh in, say, 100mS (or maybe a
bit more).
On Sat, 29 Jul 2023 12:08:27 +0100
Chris Green <cl@isbd.net> wrote:
No, sadly those E-Ink displays are too slow. I don't need really fast refresh but I do need to be able to refresh in, say, 100mS (or maybe a
bit more).
How about this ?
https://www.adafruit.com/product/1303
David Taylor <david-taylor@blueyonder.co.uk.invalid> wrote:
On 29/07/2023 09:46, Chris Green wrote:No, sadly those E-Ink displays are too slow. I don't need really fast refresh but I do need to be able to refresh in, say, 100mS (or maybe a
I'm trying to find a display to use with a Pi that will be readable in
direct sunlight (on a boat).
I can find LCD numeric displays using the Hitachi HD44780 interface
and they work OK in the sun but I'm after a graphic display of some
sort. It needs to be a reasonable size, so all the 128 x 64 ones are
too small really. Something like a 7" display would be ideal.
Does anyone here know of anything like this that doesn't cost hundreds
of pounds?
Chris,
If an update rate of, say, 30 seconds is adequate, and a 74 mm diagonal is >> adequate, you could look at the Pimoroni Badger - 296 x 128 pixels. Available
plain, or with embedded wireless:
https://shop.pimoroni.com/products/badger-2040?variant=39752959852627
https://shop.pimoroni.com/products/badger-2040-w?variant=40514062188627 >>
Using two lines of characters it's readable at 2m away. Program with Python -
many examples and help easily available.
bit more).
Will they really not do that speed?
Shame, I like e-ink
On Sat, 29 Jul 2023 17:40:36 +0100
The Natural Philosopher <tnp@invalid.invalid> wrote:
Will they really not do that speed?
Shame, I like e-ink
The fastest (E-ink Carta) are around 450ms for a complete refresh
which is OK for turning pages in a book.
On 29/07/2023 12:08, Chris Green wrote:
David Taylor <david-taylor@blueyonder.co.uk.invalid> wrote:
On 29/07/2023 09:46, Chris Green wrote:No, sadly those E-Ink displays are too slow. I don't need really fast refresh but I do need to be able to refresh in, say, 100mS (or maybe a
I'm trying to find a display to use with a Pi that will be readable in >>> direct sunlight (on a boat).
I can find LCD numeric displays using the Hitachi HD44780 interface
and they work OK in the sun but I'm after a graphic display of some
sort. It needs to be a reasonable size, so all the 128 x 64 ones are >>> too small really. Something like a 7" display would be ideal.
Does anyone here know of anything like this that doesn't cost hundreds >>> of pounds?
Chris,
If an update rate of, say, 30 seconds is adequate, and a 74 mm diagonal is >> adequate, you could look at the Pimoroni Badger - 296 x 128 pixels. Available
plain, or with embedded wireless:
https://shop.pimoroni.com/products/badger-2040?variant=39752959852627 >>
https://shop.pimoroni.com/products/badger-2040-w?variant=40514062188627 >>
Using two lines of characters it's readable at 2m away. Program with Python -
many examples and help easily available.
bit more).
Will they really not do that speed?
Shame, I like e-ink
But I have no idea how to drive it. What *is* an SPI? Ah! Serial
peripheral interface, so it wont be fast. e-ink is alway pretty sluggish >though anyway.
Ahem A Rivet's Shot <steveo@eircom.net> wrote:
On Sat, 29 Jul 2023 12:08:27 +0100
Chris Green <cl@isbd.net> wrote:
No, sadly those E-Ink displays are too slow. I don't need really fast refresh but I do need to be able to refresh in, say, 100mS (or maybe a bit more).
Do you need to refresh the whole screen? Many of the e-ink displays are
able to do a partial refresh in much shorter time.
How about this ?
https://www.adafruit.com/product/1303
The Pixel Qi company went bankrupt in 2015, and while supposedly this one
has the rights to manufacture and claims to do so: https://www.tripuso.com/index.html
it's not clear if they still do.
However it is possible to buy the 7" panels on Aliexpress: https://www.aliexpress.com/item/1005001944445301.html https://www.aliexpress.com/item/4001025242130.html
datasheet https://www.openvario.org/lib/exe/fetch.php?media=projects:series_00:spec_sheet_pq070ws01_dcn20130103-100.pdf
and it looks like the decoder board used by Adafruit is available: https://www.aliexpress.com/item/1005003128606387.html
(although the Adafruit 10.1" panel has a different pinout from the Aliexpress 7" one, so a cable would need to be made)
The Adafruit 10.1" panel is also available, for a higher price: https://www.aliexpress.com/item/32717016812.html
Looking at the datasheet it looks pretty plug and play - you switch from transmissive through transflective to reflective mode by just dimming the backlight down to zero. When the ambient light is strong the reflective pixels wash out the transmissive ones, resulting in semi-greyscale.
The 7" is about 2W in 100% backlight and 0.5W in 0% backlight, so not as low power as e-ink, but acceptable if you don't need such low power consumption.
Almost tempted to get one to play with, if only I had an application...
No, I don't need to refresh it all. The only relatively fast refresh
is for the rudder position indicator which would just be a single dark
cursor (or similar) moving about.
Power isn't an issue for me, it's on a canal/river boat with
(relatively) lots of 12 volt power available.
Theo <theom+news@chiark.greenend.org.uk> wrote:
Ahem A Rivet's Shot <steveo@eircom.net> wrote:No, I don't need to refresh it all. The only relatively fast refresh
On Sat, 29 Jul 2023 12:08:27 +0100
Chris Green <cl@isbd.net> wrote:
No, sadly those E-Ink displays are too slow. I don't need really fast >> > > refresh but I do need to be able to refresh in, say, 100mS (or maybe a >> > > bit more).
Do you need to refresh the whole screen? Many of the e-ink displays are
able to do a partial refresh in much shorter time.
is for the rudder position indicator which would just be a single dark
cursor (or similar) moving about.
Am I missing something if I propose an old analog meter where the hand shows the rudder position?
Or a needle connected to a stepper motor?
I was into that stuff some years back, used a Pocket book Aqua2 (e-ink display) to connect to
my software server.
https://panteltje.nl/panteltje/xgpspc/index.html
Not that much impressed with e-ink...
There exist very good sunlight readable monitors I have heard.
Do not have a boat at this time...
On a sunny day (Sat, 29 Jul 2023 19:27:46 +0100) it happened Chris Green <cl@isbd.net> wrote in <2a2gpj-7p752.ln1@esprimo.zbmc.eu>:
Theo <theom+news@chiark.greenend.org.uk> wrote:
Ahem A Rivet's Shot <steveo@eircom.net> wrote:No, I don't need to refresh it all. The only relatively fast refresh
On Sat, 29 Jul 2023 12:08:27 +0100
Chris Green <cl@isbd.net> wrote:
No, sadly those E-Ink displays are too slow. I don't need really fast >> > > refresh but I do need to be able to refresh in, say, 100mS (or maybe a >> > > bit more).
Do you need to refresh the whole screen? Many of the e-ink displays are >> able to do a partial refresh in much shorter time.
is for the rudder position indicator which would just be a single dark >cursor (or similar) moving about.
Am I missing something if I propose an old analog meter where the hand shows the rudder position?
But I have no idea how to drive it. What *is* an SPI? Ah! Serial
peripheral interface, so it wont be fast. e-ink is alway pretty sluggish though anyway.
If you decide to use e.g. a radio control servo, there are very
inexpensive 'servo testers' which do in fact have a pot in the middle.
The whole lot could be had for just a few dollars. You could wire your
pot up to them. Or generate your own PWM with a pi - the servo spec is a
20 Hz (or thereabouts) repetition of a 1-2ms pulse, with 1.5ms being the >>putative 'straight ahead' position.
Analogue meters don't come cheap or with suitable scales these days.
And thay are soewahtt fragile.
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