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krisnation2000
Posts: 38
Joined: Sun Mar 16, 2014 12:18 am

Cheapest LCD screen?

Fri Aug 01, 2014 5:49 am

Whats a cheap LCD screen under 30$? Im trying to make a portable game console, Sorry if this would be in the wrong section, I thought it would go in addons cause the LCD is on the GPIO or W/e...

GShocked
Posts: 19
Joined: Mon Aug 18, 2014 2:41 pm

Re: Cheapest LCD screen?

Mon Aug 18, 2014 3:09 pm

You can get a mini car monitor like this one:
http://www.amazon.com/3-5-Inch-TFT-Moni ... 22+monitor
You need to get a good PSU for that though. Those types of monitors may say 480p but they are all 320x240

You can spend a little extra for these types of monitors:
http://www.amazon.com/JBtek-Version-480 ... pi+monitor

Or this kind:
http://www.amazon.com/Tontec-Raspberry- ... pi+monitor

tinylcd
Posts: 206
Joined: Sat Oct 26, 2013 4:07 am

Cheapest LCD screen 3.5 inch 320x480 pixels

Tue Aug 19, 2014 4:20 am

hello

you can get one of the cheapest lcd screen 3.5 inch with higher screen resolution 320x480 from

www.neosecsolutions.com

there is no need of any additional power supply for these screens

they draw 3.3 volts from raspberry pi

regards
tinylcd

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AndyD
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Re: Cheapest LCD screen?

Tue Aug 19, 2014 4:55 am

tinylcd wrote:hello

you can get one of the cheapest lcd screen 3.5 inch with higher screen resolution 320x480 from

http://www.neosecsolutions.com

there is no need of any additional power supply for these screens

they draw 3.3 volts from raspberry pi

regards
tinylcd
I have one of the tinylcd displays and it works well. I went for the cheapest option without touch screen and I am using notro's fbtft driver.
GShocked wrote:...You can spend a little extra for these types of monitors:
http://www.amazon.com/JBtek-Version-480 ... pi+monitor
...
There is a long thread on the JBtek 3.5 inch TFT LCD.
I don't have one of these HDMI displays, but they appear to be a good choice. There is no driver required, but they do need an external power source.

Or, you can wait for the official raspberry pi display.

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sav25
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Re: Cheapest LCD screen?

Wed Aug 27, 2014 12:02 pm

I did a bit of a comparison review on the PiTFT and the NeoSec (TinlyLCD) screen. May help steer your purchase depending on what you want the screen to do:

http://www.averagemanvsraspberrypi.com/ ... y-for.html

mt12345
Posts: 11
Joined: Sun Jun 03, 2012 6:41 pm

Re: Cheapest LCD screen 3.5 inch 320x480 pixels

Sun Dec 13, 2015 9:41 am

tinylcd wrote:hello

you can get one of the cheapest lcd screen 3.5 inch with higher screen resolution 320x480 from

http://www.neosecsolutions.com

there is no need of any additional power supply for these screens

they draw 3.3 volts from raspberry pi

regards
tinylcd
what is the current draw and is brightness adjustable?

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Wed Jan 27, 2016 12:53 pm

Has anyone successfully used one of these screens with the pi zero?

Am thinking this would work nicely for a portable emulation system in a Gameboy shell.

tinylcd
Posts: 206
Joined: Sat Oct 26, 2013 4:07 am

Re: Cheapest LCD screen?

Thu Jan 28, 2016 4:56 am

Hello

recently we have released a jessie image for the pizero to work with our 3.5 inch tft

http://www.neosecsolutions.com//product ... 8&cPath=17


regards
tinylcd

fanoush
Posts: 544
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Re: Cheapest LCD screen?

Thu Jan 28, 2016 11:36 am

If you really want the cheapest stuff then go for 320x240 SPI screens with or without touchscreen with ILI9341 controller, the ebay is full of them in various sizes 2.2",2.4",2.8"

I got these two just to try one with touchscreen and one without both work just fine as displays

2.2" without touchscreen
http://www.ebay.com/itm//131133739989

2.8" witch touch
http://www.ebay.com/itm/191531963190

They are all alike, for 2.2" I used same settings as adafruit one here https://github.com/notro/fbtft/wiki/LCD ... dafruit-22

For touchscreen I used ads7846 driver described here
https://github.com/notro/fbtft/wiki/Touchpanel and so far it works more or less fine but the result is very inaccurate. But the 2.8" LCD came cracked (I got full refund) so most probably the inaccuracy is due to the crack, I ordered another one. As displays they both work fine I followed tutorial and get framebuffer console on them and the refresh rates seems fine. The support is in standard kernel just loading correct device overlay or inserting module with corect parameters makes them running.

As for 320x480 I don't know, the ILI9341 driver is only for 320x240 and SPI might be slow for such resolution (?)

martin8777
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Re: Cheapest LCD screen?

Thu Jan 28, 2016 12:02 pm

Awesome, thanks!

I had seen these on ebay since I had previously posted and was going to ask if these were any good. I think I'll grab one of the 2.8" screens, I don't care about touch so as long as they work ok as a display then that's great!

cheers
fanoush wrote:If you really want the cheapest stuff then go for 320x240 SPI screens with or without touchscreen with ILI9341 controller, the ebay is full of them in various sizes 2.2",2.4",2.8"

I got these two just to try one with touchscreen and one without both work just fine as displays

2.2" without touchscreen
http://www.ebay.com/itm//131133739989

2.8" witch touch
http://www.ebay.com/itm/191531963190

They are all alike, for 2.2" I used same settings as adafruit one here https://github.com/notro/fbtft/wiki/LCD ... dafruit-22

For touchscreen I used ads7846 driver described here
https://github.com/notro/fbtft/wiki/Touchpanel and so far it works more or less fine but the result is very inaccurate. But the 2.8" LCD came cracked (I got full refund) so most probably the inaccuracy is due to the crack, I ordered another one. As displays they both work fine I followed tutorial and get framebuffer console on them and the refresh rates seems fine. The support is in standard kernel just loading correct device overlay or inserting module with corect parameters makes them running.

As for 320x480 I don't know, the ILI9341 driver is only for 320x240 and SPI might be slow for such resolution (?)

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Thu Jan 28, 2016 12:18 pm

fanoush wrote: 2.2" without touchscreen
http://www.ebay.com/itm//131133739989

2.8" witch touch
http://www.ebay.com/itm/191531963190
Oh wow, those are even cheaper than the ones I was looking at. The ones I saw were approx $20 and had the connector on them to plug straight onto the GPIO of the Pi.
Do these just need to be wired to the appropriate pins on the GPIO and draw power from the Pi or will they need something else?

fanoush
Posts: 544
Joined: Mon Feb 27, 2012 2:37 pm

Re: Cheapest LCD screen?

Thu Jan 28, 2016 12:38 pm

martin8777 wrote:
fanoush wrote: 2.2" without touchscreen
http://www.ebay.com/itm//131133739989

2.8" witch touch
http://www.ebay.com/itm/191531963190
Oh wow, those are even cheaper than the ones I was looking at. The ones I saw were approx $20 and had the connector on them to plug straight onto the GPIO of the Pi.
Do these just need to be wired to the appropriate pins on the GPIO and draw power from the Pi or will they need something else?
Yes, just wiring, nothing else. On ebay anything is more expensive if it has "raspberry" in description, even 20x2 pin header or cables :-)

I'll post a photo of the screen attached and the modprobe line I am using when I get back home.

EDIT:
The wiring is also described here:
https://github.com/notro/fbtft/wiki/LCD ... dafruit-22
SPI + chip select + extra two gpios for reset and D/C (selectable, I used 24 and 25 ) and one extra optional gpio for backlight (selectable, I used 18)

The userspace python code from adafruit (without any kernel driver) works too
https://learn.adafruit.com/user-space-s ... li9341-2-8
they just use different gpio numbers for the selectable ones, so either python code needs fixing or one can wire it like they do
Last edited by fanoush on Thu Jan 28, 2016 12:49 pm, edited 1 time in total.

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Thu Jan 28, 2016 12:40 pm

fanoush wrote: I'll post a photo of the screen attached and the modprobe line I am using when I get back home.
That would be great, thanks. What are you using it for right now? Have you used it with retropie at all?

fanoush
Posts: 544
Joined: Mon Feb 27, 2012 2:37 pm

Re: Cheapest LCD screen?

Thu Jan 28, 2016 1:13 pm

martin8777 wrote:What are you using it for right now? Have you used it with retropie at all?
Not yet, I just wanted to try them how they work, maybe to use them as status display. So far I tried stuff described here https://github.com/notro/fbtft/wiki/Framebuffer-use and enabled shell console and was quite happy with the result. Will try more later.

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Fri Jan 29, 2016 1:04 pm

martin8777 wrote:
fanoush wrote: 2.2" without touchscreen
http://www.ebay.com/itm//131133739989

2.8" witch touch
http://www.ebay.com/itm/191531963190
Was this the seller you bought from or another one? If it was, were they OK to deal with and how long did it take for you to receive the screens?

Thanks.

fanoush
Posts: 544
Joined: Mon Feb 27, 2012 2:37 pm

Re: Cheapest LCD screen?

Wed Feb 03, 2016 9:28 am

martin8777 wrote: Was this the seller you bought from or another one? If it was, were they OK to deal with and how long did it take for you to receive the screens?
Thanks.
Yes, same sellers. Took few weeks from china. No issues except the bigger one was cracked in corner due to poor packing so I got full refund. BTW there is Chinese new year celebration so it is not good time to order these days.

I cannot upload photos of my setup as the forum has 64KB file limit but same lcd is describe here
http://aaron-brown.net/blog/?p=99
my exact modprobe line is

Code: Select all

sudo modprobe fbtft_device name=adafruit22a txbuflen=32768 speed=64000000 fps=50
I also tried fbcp https://github.com/tasanakorn/rpi-fbcp and played some videos and it is quite fast and fluent, surprisingly fbcp does not eat lot of CPU since the copy (includig resizing) is done by GPU directly into fb1 framebuffer.

The only issue I noticed is that the backlight flickers slightly when the display gets updated. It is not that bad but definitely noticable.

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Wed Feb 03, 2016 1:21 pm

fanoush wrote: Yes, same sellers. Took few weeks from china. No issues except the bigger one was cracked in corner due to poor packing so I got full refund. BTW there is Chinese new year celebration so it is not good time to order these days.
I went ahead and ordered this and a few other bits last week and they say they've shipped them so hopefully missed the Chinese New Year holiday. I'm in no great rush anyway so not a big deal if not.
fanoush wrote: The only issue I noticed is that the backlight flickers slightly when the display gets updated. It is not that bad but definitely noticable.
I wonder if that will be an issue with gaming? Will have to check that once I have it set up.

blubbblubb
Posts: 3
Joined: Tue Feb 16, 2016 10:27 pm

Re: Cheapest LCD screen?

Tue Feb 16, 2016 10:31 pm

fanoush wrote: Yes, just wiring, nothing else. On ebay anything is more expensive if it has "raspberry" in description, even 20x2 pin header or cables :-)

I'll post a photo of the screen attached and the modprobe line I am using when I get back home.

EDIT:
The wiring is also described here:
https://github.com/notro/fbtft/wiki/LCD ... dafruit-22
SPI + chip select + extra two gpios for reset and D/C (selectable, I used 24 and 25 ) and one extra optional gpio for backlight (selectable, I used 18)
I also just ordered the Display with the touchpanel however im not 100% sure about the wiring yet, the link you provided does not include the touchscreen related pins, how should they be connected?

martin8777
Posts: 16
Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Sat Mar 12, 2016 2:49 am

martin8777 wrote: I went ahead and ordered this and a few other bits last week and they say they've shipped them so hopefully missed the Chinese New Year holiday. I'm in no great rush anyway so not a big deal if not.
.
Well, this finally showed up today and I've had a quick stab at getting it working but didn't have much luck. I tried to follow the guide on the adafruit site but it didn't really match up with how the pins were labelled on the screen so I'm not convinced it was hooked up correctly.
When I followed the instructions for fbtft at http://aaron-brown.net/blog/?p=99, the firmware updater killed my raspbian install so I had to grab another sd card and start again.

I'll give it another go next week sometime I think. More than anything I really just want to know if the screen works or not, the packaging was terrible, just a plastic bag and one layer of bubble wrap around the screen so for all I know it's dead. But at least it was cheap!

klricks
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Re: Cheapest LCD screen?

Sat Mar 12, 2016 5:51 am

martin8777 wrote:..... But at least it was cheap!
IMO anything that was cheap, but doesn't work as expected, is in reality very expensive.
Unless specified otherwise my response is based on the latest and fully updated RPiOS Buster w/ Desktop OS.

fanoush
Posts: 544
Joined: Mon Feb 27, 2012 2:37 pm

Re: Cheapest LCD screen?

Sat Mar 12, 2016 5:49 pm

martin8777 wrote: When I followed the instructions for fbtft at http://aaron-brown.net/blog/?p=99, the firmware updater killed my raspbian install so I had to grab another sd card and start again.
That tutorial is good for pinout, but it is a bit old. It is not needed to kill your raspbian by installing anything, all drivers/kernel modules are already present in recent raspbian. you just need to wire it correctly, enable SPI if you don't have it already (sudo raspi-config, advanced, SPI, yes, yes) and enter correct modprobe line.
martin8777 wrote:the packaging was terrible, just a plastic bag and one layer of bubble wrap around the screen so for all I know it's dead. But at least it was cheap!
Not sure what you expected for packaging. As long as it is not cracked I'd guess it is OK and the problem is most probably not the display but wiring or the modrpobe line.

martin8777
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Joined: Thu Nov 13, 2014 7:43 pm

Re: Cheapest LCD screen?

Sat Mar 12, 2016 6:43 pm

fanoush wrote: Not sure what you expected for packaging.
An envelope. Preferably padded.

fanoush
Posts: 544
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Re: Cheapest LCD screen?

Sat Mar 12, 2016 8:17 pm

blubbblubb wrote: I also just ordered the Display with the touchpanel however im not 100% sure about the wiring yet, the link you provided does not include the touchscreen related pins, how should they be connected?
Sorry, missed that one. Touchscreen is also SPI based so it shares MISO/MOSI/CLK with the LCD so I connected together pins SDI<->T_DIN,SDO<->T_DO,SCK<->T_CLK. Then it needs its own chip select so the T_CS pin of touchscreen need to be wired to CE1 on the Pi (CE0 is used by lcd). And it also needs extra IRQ pin wired to some GPIO, I used GPIO17 for that. I did not figure out how to insert the module via modprobe but following device overlay added to /boot/config.txt worked for me

Code: Select all

dtoverlay=ads7846,penirq=17,cs=1
there are additional optional parameters to that overlay like ",xohms=60,pmax=255" than can change sensitivity but since my LCD with touchscreen was cracked it was somehow inaccurate due to the crack so I don't know if those parameters make difference and what values are best.
The I followed "tslib" chapter in https://github.com/notro/fbtft/wiki/Touchpanel and the ts_test and ts_calibrate commands worked with the touchscreen.

blubbblubb
Posts: 3
Joined: Tue Feb 16, 2016 10:27 pm

Re: Cheapest LCD screen?

Sat Apr 09, 2016 2:17 pm

Hi,

thanks, i received my Screen a couple of weeks back, but the jumper cables just arrived 2 days ago...

The Touchscreen works like a charm, just have some jitter while moving Windows around, but as im not really going for moving stuff on the screen thats ok for me (just want some buttons to control music playback and displaying current Track Information

blaablaaguy
Posts: 623
Joined: Sun Sep 27, 2015 3:26 pm

Re: Cheapest LCD screen?

Mon Apr 11, 2016 8:18 pm

blubbblubb wrote:Hi,

thanks, i received my Screen a couple of weeks back, but the jumper cables just arrived 2 days ago...

The Touchscreen works like a charm, just have some jitter while moving Windows around, but as im not really going for moving stuff on the screen thats ok for me (just want some buttons to control music playback and displaying current Track Information
Hi,
Which screen did you use?
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