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#11
A13 / Re: A13-OlinuXino disagling de...
Last post by Davide - September 08, 2025, 11:00:44 AMIn the end I moved to A13-OLinuXino-bullseye-minimal-20250305-103314 image and was able to achieve what I needed.
Many thanks for your help. As soon as possible, I will try your solution and update the topic
Many thanks for your help. As soon as possible, I will try your solution and update the topic
#12
ESP32 / Re: ESP32-POE-ISO and OLED Dis...
Last post by LubOlimex - September 08, 2025, 10:39:55 AMLooks good so far. Just you tried a library that is made for another controller? From the Amazon page it seems like the display uses SSD1106 (not SSD1306). Maybe try another library or another demo for SSD1106. Also it is possible that the manufacturer used another controller.
Pins 32 and 33 are fine, just make sure that in your code they are defined for I2C operation.
This is usually done with:
Wire.begin (32, 33);
Best regards,
Lub/OLIMEX
Pins 32 and 33 are fine, just make sure that in your code they are defined for I2C operation.
This is usually done with:
Wire.begin (32, 33);
Best regards,
Lub/OLIMEX
#13
ESP32 / ESP32-POE-ISO and OLED Display
Last post by franck67 - September 07, 2025, 08:14:24 PMHello everyone,
i am relatively new to all of this, so some of my questions might seem odd, i apologize in advance
I started to get interested in those boards, because i want to monitor the production of my solar panels in real time without subscribing to any manufacturer's cloud.
I then heard about the openDTU project, which allows to monitor my micro-inverter with an ESP32 board, and an antenna.
I chose the ESP32-POE-ISO because i have a POE switch just next the place i want to set it up.
I now want to add the antenna i bought, and also a OLED display. I chose those 2 :
antenna : https://www.amazon.fr/dp/B09G9GJCXW?ref=ppx_yo2ov_dt_b_fed_asin_title
oled : https://www.amazon.fr/dp/B0CWGP53JW?ref=ppx_yo2ov_dt_b_fed_asin_title
i checked this picture for the wiring :
https://www.opendtu.solar/hardware/olimexpoeiso/#schematic
so i soldered port 32/33 to SDA/SCL and port GND/+3.3 to GND/VCC on my display
Before going further, i would like to see if i can display something on the screen in a easy way.
I'm using Arduino IDE, i could install the board, the port, i can connect to my Olimex board.
I could write a small program that blinks leds on my pin 32 and 33, so it looks like everything on the board and my solderings is working, but when i plug the display, i can't get it to display something.
i downloaded the library Adafruit_SSD1306.h, but then i'm stuck.
Is there a possibility that the 32/33 ports arent the good one ? if yes how to change them since my wires are already soldered ?
Can someone give me a little code to test this screen ? like to write "hello world" or something, so i can be sure i didnt burn something in my tests ?
Thanks a lot for your help
i am relatively new to all of this, so some of my questions might seem odd, i apologize in advance
I started to get interested in those boards, because i want to monitor the production of my solar panels in real time without subscribing to any manufacturer's cloud.
I then heard about the openDTU project, which allows to monitor my micro-inverter with an ESP32 board, and an antenna.
I chose the ESP32-POE-ISO because i have a POE switch just next the place i want to set it up.
I now want to add the antenna i bought, and also a OLED display. I chose those 2 :
antenna : https://www.amazon.fr/dp/B09G9GJCXW?ref=ppx_yo2ov_dt_b_fed_asin_title
oled : https://www.amazon.fr/dp/B0CWGP53JW?ref=ppx_yo2ov_dt_b_fed_asin_title
i checked this picture for the wiring :
https://www.opendtu.solar/hardware/olimexpoeiso/#schematic
so i soldered port 32/33 to SDA/SCL and port GND/+3.3 to GND/VCC on my display
Before going further, i would like to see if i can display something on the screen in a easy way.
I'm using Arduino IDE, i could install the board, the port, i can connect to my Olimex board.
I could write a small program that blinks leds on my pin 32 and 33, so it looks like everything on the board and my solderings is working, but when i plug the display, i can't get it to display something.
i downloaded the library Adafruit_SSD1306.h, but then i'm stuck.
Is there a possibility that the 32/33 ports arent the good one ? if yes how to change them since my wires are already soldered ?
Can someone give me a little code to test this screen ? like to write "hello world" or something, so i can be sure i didnt burn something in my tests ?
Thanks a lot for your help
#14
RK3188 / Re: [RK3328-SOM-EVB] Using UA...
Last post by LubOlimex - September 05, 2025, 04:46:21 PMThe fact that it works with the old image means it is software issue in the new image.
I tried this one here:
https://forum.armbian.com/topic/16100-rockpi-e-enabling-uart1-and-otg-using-custom-dt-overlays/
After reboot I see serial1 but it won't work probably something from the old image dts should be copied too. Maybe because the pinout is different.
I tried this one here:
https://forum.armbian.com/topic/16100-rockpi-e-enabling-uart1-and-otg-using-custom-dt-overlays/
After reboot I see serial1 but it won't work probably something from the old image dts should be copied too. Maybe because the pinout is different.
#15
A64 / Re: Bookworm upgrade availabil...
Last post by mossroy - September 05, 2025, 03:45:22 PMNow that Debian 13 (Trixie) has been released, I've tested again the Debian Installer on the Olinuxino devices I have:
- Olinuxino A20-OLinuXino-MICRO: can be installed by Debian Trixie installer (with https://deb.debian.org/debian/dists/stable/main/installer-armhf/current/images/netboot/SD-card-images/). I did not test for long, but it seems to be stable
- Olinuxino A64-OLinuXino-2Ge8G-IND: The Debian installer https://deb.debian.org/debian/dists/stable/main/installer-arm64/current/images/netboot/SD-card-images/ does not start (stuck on "Booting kernel...". With "earlycon" bootarg, it seems to show it crashes on an mmc step). After replacing the dtb by the one from Olimex latest image, I could run the installer properly, and install it on the SDcard. However, I did not manage to make it start afterwards (stuck on "Booting kernel..." too, but the "earlycon" trick does not seem to give more detail)
So the problem remains with my A64 (2Ge8G) boards.
I don't care about its eMMC: is there a software or hardware solution to make it ignored? Hopefully it would help installing a regular Debian on it
- Olinuxino A20-OLinuXino-MICRO: can be installed by Debian Trixie installer (with https://deb.debian.org/debian/dists/stable/main/installer-armhf/current/images/netboot/SD-card-images/). I did not test for long, but it seems to be stable
- Olinuxino A64-OLinuXino-2Ge8G-IND: The Debian installer https://deb.debian.org/debian/dists/stable/main/installer-arm64/current/images/netboot/SD-card-images/ does not start (stuck on "Booting kernel...". With "earlycon" bootarg, it seems to show it crashes on an mmc step). After replacing the dtb by the one from Olimex latest image, I could run the installer properly, and install it on the SDcard. However, I did not manage to make it start afterwards (stuck on "Booting kernel..." too, but the "earlycon" trick does not seem to give more detail)
So the problem remains with my A64 (2Ge8G) boards.
I don't care about its eMMC: is there a software or hardware solution to make it ignored? Hopefully it would help installing a regular Debian on it
#16
RK3188 / Re: [RK3328-SOM-EVB] Using UA...
Last post by LubOlimex - September 05, 2025, 11:20:35 AMThe instructions I published above were for the buster image, where DTC edit is possible via the armbian-config. Maybe test with the buster image instead. The archive "RK3328-SOM-buster-20220122-002412.img.7z" can be found at the ftp.
Maybe armbian changed the way to edit DTC in the latest releases
Edit: I will investigate further when I have the time. Thanks for pointing the serial 1 is serial@ff120000 I have edited my previous post.
Maybe armbian changed the way to edit DTC in the latest releases
Edit: I will investigate further when I have the time. Thanks for pointing the serial 1 is serial@ff120000 I have edited my previous post.
#17
A13 / Re: A13-OlinuXino disagling de...
Last post by LubOlimex - September 05, 2025, 08:38:55 AMYou might need to rebuild the u-boot. Check the instructions and files here:
https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A13/A13-build
Also check this forum post:
https://www.olimex.com/forum/index.php?topic=1788.0
https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A13/A13-build
Also check this forum post:
https://www.olimex.com/forum/index.php?topic=1788.0
#18
A20 / Re: Best practices to optimize...
Last post by LubOlimex - September 05, 2025, 08:08:08 AMThe most stable images are the ones we provide. Olimage and older kernel sunxi images. Refer to the Linux guide here, it explains the Linux options in detail:
https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf
https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf
#19
A13 / Re: Tips and experiences with ...
Last post by LubOlimex - September 05, 2025, 08:07:27 AMThe most stable images are the ones we provide. Olimage and older kernel sunxi images. Refer to the Linux guide here, it explains the Linux options in detail:
https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf
https://github.com/OLIMEX/OLINUXINO/blob/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf
#20
A13 / Tips and experiences with A13 ...
Last post by michaelarrington - September 05, 2025, 05:33:00 AMHello Olimex community,
I've recently started working with the Olimex A13 board (Cortex-A8, 1GHz, 512MB RAM, 4GB Flash, VGA, SD-card, 3x USB host, WIFI, 72 GPIOs, UEXT, Audio In/Out) and I'm really enjoying exploring its capabilities.
I would like to ask for some advice and hear about your experiences: PolyTrack
Which Linux
I think the A13 is still a very interesting board for lightweight projects, and I'd love to learn from the community about how to optimize it for real-world use cases.
Looking forward to your input and sharing of experiences!
I really appreciate any help you can provide.
I've recently started working with the Olimex A13 board (Cortex-A8, 1GHz, 512MB RAM, 4GB Flash, VGA, SD-card, 3x USB host, WIFI, 72 GPIOs, UEXT, Audio In/Out) and I'm really enjoying exploring its capabilities.
I would like to ask for some advice and hear about your experiences: PolyTrack
Which Linux
- images are currently the most stable for A13?
- Any tips for getting WiFi performance more reliable?
- Has anyone successfully used the 72 GPIOs for larger projects (e.g., sensor arrays or custom peripherals)?
- What are the best practices when working with UEXT modules on this board?
- Any known issues with audio in/out, and how to fix or improve it?
I think the A13 is still a very interesting board for lightweight projects, and I'd love to learn from the community about how to optimize it for real-world use cases.
Looking forward to your input and sharing of experiences!
I really appreciate any help you can provide.