I'm looking for a display for a Pi that will work in direct bright
sun, thus I think an LCD of some sort would make sense. I don't
really need colour. just some sort of 'dark on light' to display text
etc.
What's available? Are there any HDMI interface LCD displays?
I could use one of the HD44780 displays driven directly from the Pi
(i.e. not HDMI) but I really want something a little bigger.
Can anyone suggest anything suitable?
The only displays I know to work in bright direct sunlight are 'e-ink' displays, those are black on white.
I have seen some projects using those for raspberries, years ago,
maybe googling a bit will find one.
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:
The only displays I know to work in bright direct sunlight are 'e-ink' displays, those are black on white.
I have seen some projects using those for raspberries, years ago,
maybe googling a bit will find one.
There are displays like these: https://www.waveshare.com/product/raspberry-pi/displays/e-paper.htm
eg
https://www.waveshare.com/7.5inch-e-paper-hat.htm https://www.waveshare.com/2.13inch-e-paper-hat.htm https://www.waveshare.com/product/raspberry-pi/displays/e-paper/10.3inch-hdmi-e-paper.htm
But be aware the HAT ones require code to drive them - ie they aren't intended to display the desktop, but driven from a specific application. That's probably what you want anyway from an eink display anyway given the refresh rates.
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:
The only displays I know to work in bright direct sunlight are 'e-ink'
displays, those are black on white.
I have seen some projects using those for raspberries, years ago,
maybe googling a bit will find one.
There are displays like these: >https://www.waveshare.com/product/raspberry-pi/displays/e-paper.htm
eg
https://www.waveshare.com/7.5inch-e-paper-hat.htm >https://www.waveshare.com/2.13inch-e-paper-hat.htm >https://www.waveshare.com/product/raspberry-pi/displays/e-paper/10.3inch-hdmi-e-paper.htm
But be aware the HAT ones require code to drive them - ie they aren't >intended to display the desktop, but driven from a specific application. >That's probably what you want anyway from an eink display anyway given the >refresh rates.
(there may be Linux drivers to enable an SPI display to show the desktop, >something that would need investigating for your specific display)
Theo
Theo <theom+news@chiark.greenend.org.uk> wrote:
Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:I'm not wanting to display a desktop, the display is for use on a boat instrument panel to show things like battery voltages, temperatures
The only displays I know to work in bright direct sunlight are 'e-ink'
displays, those are black on white.
I have seen some projects using those for raspberries, years ago,
maybe googling a bit will find one.
There are displays like these:
https://www.waveshare.com/product/raspberry-pi/displays/e-paper.htm
eg
https://www.waveshare.com/7.5inch-e-paper-hat.htm
https://www.waveshare.com/2.13inch-e-paper-hat.htm
https://www.waveshare.com/product/raspberry-pi/displays/e-paper/10.3inch-hdmi-e-paper.htm
But be aware the HAT ones require code to drive them - ie they aren't
intended to display the desktop, but driven from a specific application.
That's probably what you want anyway from an eink display anyway given the >> refresh rates.
and rudder position.
The above are interesting but the slow refresh is a bit of a nuisance
as the rudder possition display needs to refresh reasonably frequently.
The 10" one is a bit pricey too! :-)
I'll expand a little on what I'm doing:-
On my boat I have a Beaglebone Black (boo, hiss say the Pi
enthusiasts) which monitors the battery voltages, rudder position,
etc. This has a 4 x 40 LCD display inside the boat, close to the BBB
and driven directly by the BBB using its 4-bit data interface.
I want a similar display for the flying bridge which is several metres
away from the BBB. Currently I have a 4 x 20 display driven by RS232
from the BBB but that's a bit flakey and the 4 x 20 display isn't
really enough characters.
So I was considering running an HDMI display off the BBB as HDMI can
do 10 metres or so, however the sun can be very bright, hence asking
this question. It seems not to be a practical solution.
Thus what I think I will do is add a second BBB and put it on the
flying bridge close to a second 4 x 40 LCD display. I already have
wired ethernet so it's easy for BBB number two to get the values from
BBB number one and I already know how to drive the display.
I'm not wanting to display a desktop, the display is for use on a boat instrument panel to show things like battery voltages, temperatures
and rudder position.
The above are interesting but the slow refresh is a bit of a nuisance
as the rudder possition display needs to refresh reasonably frequently.
Chris Green <cl@isbd.net> wrote:
I'm not wanting to display a desktop, the display is for use on a boat
instrument panel to show things like battery voltages, temperatures
and rudder position.
The above are interesting but the slow refresh is a bit of a nuisance
as the rudder possition display needs to refresh reasonably frequently.
OK. So you want an LCD, but not the smartphone/tablet/laptop kind. I think it might be called a 'dot matrix graphic LCD',
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