2024-03-26, 02:44 PM
(2024-03-20, 06:42 PM)Hillzzz Wrote:(2024-03-20, 01:19 PM)fjj Wrote:(2023-11-20, 10:05 PM)Hillzzz Wrote:(2023-11-20, 08:10 PM)Jodel Wrote:(2023-11-20, 07:46 PM)Hillzzz Wrote: Hi Jodel, I have recently purchased a Digiwave HA-101ZIEBCAD1-V 10.1 inch projected capacitive touch 1280x800 HDMI LCD screen which cost around £220 with UK VAT and import duties (Thanks Brexit ) I think you can buy the same screen without UK taxes for around £160. It has a bonded screen and is daylight readable at 1250 Nits. It's actually so bright it almost hurts to look at it. It definitely works in bright sunlight. It will run on a Pi fine using the HDMI port but also make sure you buy the non-standard Digiwave USB lead for it as one end is a tiny connector that fits on the screens control circuit board. the other end is a standard USB connector and plugs into the Pi to enable touch. The USB lead is around £6. I am now trying to write a brightness slider control app for it that uses the GPIO PWM Pin 18. It works but when you close the slider the GPIO goes to zero and the backlight turns off. So if anyone knows how to keep the GPIO Pin 18 at the last set value until the Pi is powered down I would be glad to learn from them and happy to share the code for this very nice screen.
Hi Hillzzz,
I googled "Digiwave HA-101ZIEBCAD1-V 10.1" and couldn't find it. Where did you buy it?
Jodel
Hi Jodel you can find it here https://www.soselectronic.com/en/product...1-v-378585
Hi Hillzzz,
Did you ever find an answer to the dimmer issue? I've just ordered the screen and would love to set up external dimmer control.
Thanks,
Fraser
Hi Fraser, If it's an external dimmer you want like a potentiometer knob style dimmer then all you need is a simple circuit that goes from zero to 3 volts with a potentiometer to control the voltage. If you look at the PDF circuit specs you will see the connector which controls brightness. I want to do it in software and i haven't found a solution yet. Cheers, H.
Hi Hillzzz,
I was looking at software control too. I came across two issues - the one that you mentioned with the brightness going to zero after quitting the app, and another where there was terrible flicker at lower brightness levels. I resolved the flicker issue using PIGPIO, as it uses hardware PWM timing. It should also resolve your issue as there is a daemon that runs, so the setting should stay on until the power is off. I've implemented a service to listen for the GUI app and change the PWM duty cycle. I've just got a very basic Python tkinter slider to change the brightness. The service starts on boot using systemd.
I'm essentially building a self-contained plotter for use in the open cockpit, so far this screen is looking great.
Thanks,
Fraser