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#71

New Product Ideas / Re: Which board might fit for ...

Last post by LubOlimex - February 25, 2026, 08:20:57 AM

I think the only board that fits the open-hardware criteria, 2GB of RAM and being slim is iMX8MP-SOM-4GB-IND. The rest of the SOM designs we have are not open-source hardware The idea of the SOM is to design own bottom board that exposes only the interfaces you need, while the EVB board features most of the peripherals to serve as evaluation basis for the chip, the peripherals and the Linux.

The web-page is here:

https://www.olimex.com/Products/SOM/NXP-iMX8/iMX8MP-SOM-4GB-IND/open-source-hardware

#72

New Product Ideas / Which board might fit for my p...

Last post by ted - February 25, 2026, 12:03:18 AM

Hi there,

this seem to be the only topic where my question might fit - so here we go:

i am currently tinkering on a diy-eink-tablet - so basically like a "normal" tablet - but instead of a lcd it will have an eink display. There are commercial available ones (remarkable, supernote, viwood, boox etc.) - but none of them is open (theres pinenote - but thats not really usable) and most use android.
I first landed on all the pi-named stuff - and ended up having the "zero-format" - like radxa-zero3w as reference - as it has no bulky connectors like ethernet - which a tablet does not need. Also i had a look at som's - as i had the idea to use a carrier board with a "upgradable" module on top. Then again there does not seem to be a standard connector to the carriers and most carriers also are "fat" with ethernet and USB sideways.

I already have open hardware controllers for display and touchscreen i want to use, same goes for a DC/DC converter.

So long story short - i am looking for a sbc or som that is
- preferably open hardware
- small
- capable to run linux (plan is to run something armbian or alpine/postmarketos with lomiri and software like xjournal+ for handwriting). So it should be possible to have 2GB RAM or more, maybe emmc, maybe possibility to add a SD-Card.

So looking at your boards i am not sure which one might fit. I found some who just used a raspbery and cut of or desoldered "fat" connectors like ethernet - but i'd prefer this as a last resort.

Which of your boards would you recommend for such a case?

#73

ESP32 / Re: determine available (unuse...

Last post by LubOlimex - February 24, 2026, 09:36:09 AM

Make sure the PSRAM is enabled and set to OPI (if it is set to QSPI it will not be read).

I also made this Arduino demo that shows the chip info (revision, SPI size, RAM size) for the chip, make sure Arduino IDE settings are the same:

https://github.com/OLIMEX/ESP32-S3-DevKit-LiPo/tree/main/SOFTWARE/Arduino/ESP32-S3-chip-info-demo

#74

ESP32 / Re: determine available (unuse...

Last post by LubOlimex - February 23, 2026, 08:24:09 AM

Something wrong with the software setup and installation. Better search for similar problem in ESP-IDF or VScode forums.

Maybe try Arduino IDE with these settings: https://github.com/OLIMEX/ESP32-S3-DevKit-LiPo/blob/main/SOFTWARE/Arduino/ESP32-S3-DevKit-Lipo-bat-sense/Arduino-Settings.jpg

#75

ESP32 / determine available (unused) f...

Last post by Timbopoise - February 21, 2026, 12:32:12 AM

I've searched for an answer and reviewed espressif's documentation but no clear answer.  I'm sure I missed something.

when I run idf.py size I get an interesting table of information but the Flash usage is blank.

I'm on Ubuntu 24.04, VScode, ESP32-S3 8R8

Thanks

#76

ST / Re: BB-STM32WL and Platformio/...

Last post by winfried - February 20, 2026, 01:02:06 PM

ok, I overlooked it, anyway thanks for the schematics.

BTW fyi:
I found you are using XTAL so, in radiolib we need to set TCXO_VOLTAGE to 0V, so it runs.

#77

ST / Re: BB-STM32WL and Platformio/...

Last post by LubOlimex - February 20, 2026, 08:28:31 AM

Nice progress.

About the schematic - from what I can see it seems that BB-STM32WL is not an open-hardware design. For boards that are not OSHW we only share the PDF export of the schematic.

#78

ST / Re: BB-STM32WL and Platformio/...

Last post by winfried - February 20, 2026, 01:58:21 AM

FYI,

But I found the RadioLib which supports STM32WLx. I will try to make P2P example working and post it here.

RadioLib is great,
so I got a working LoRa P2P example see
- https://git.iem.at/ritsch/pfb-bees.git -> experiments/05-p2p-radiolib

Thanks for help will be the firmware.

PS.: Is there a git repo for the BB-STM32WL KiCAD file, I can only find the PDF schematic and the KICAD for the LoRa-STM32WL-DevKit.

#79

ST / Re: BB-STM32WL and Platformio/...

Last post by winfried - February 20, 2026, 01:50:00 AM

FYI:

ad serial monitor for debugging:

Now got a working setup for a LoRa_STM32WL_DevKit using USB for powering, programming and monitor and parallel a BB-STM32WL over serial port on PA_9 and PA_10,
the

Code Select Expand

-DSERIAL_UART_INSTANCE=1 did not help.

First Since Serial Monitor of "cmsis-dap" programmer on board is connected on PB_6 and PB_7 to the programmer on the devkit I have to set the pins.

For the Serial connection  I had to set the Pins to PA_9 and PA_10.

Hints:
There is an issue if the 5V of the USB is weak like below 4.95V, programming fails.
and the new naming of the pins need are PA_9 not PA9, also the STM32flash programm of
actual platformio was too old.

Code Select Expand

; PlatformIO Project Configuration File for LoRa P2P (Peer-to-Peer) Test
; OLIMEX LoRa-STM32WL-DevKit - Direct LoRa communication without LoRaWAN
[platformio]
description = "LoRa P2P Test - Direct device-to-device communication"

[env]
platform = ststm32
framework = arduino

lib_deps =
    jgromes/RadioLib @ ^7.3.0
board = olimex_wle5
build_flags =
    -DUSB_MANUFACTURER="Olimex"
    -DUSB_PRODUCT="BB-STM32WL"
    -DBLINK_PIN=PC_15

; LoRa-STM32WL-DevKit: with built-in USB-to-serial converter for monitoring
; using CMSIS-DAP for programming/Debug.
[env:LoRa_STM32WL_DevKit]
upload_protocol = cmsis-dap
monitor_speed = 115200
build_flags = ${env.build_flags}
              -D PIN_SERIAL_TX=PB_6
              -D PIN_SERIAL_RX=PB_7

[debug]
debug_tool = cmsis-dap
debug_init_break = tbreak setup
build_flags = ${env.build_flags}
              -D PIN_SERIAL_TX=PB_6
              -D PIN_SERIAL_RX=PB_7

; BB-STM32WL program and monitor
; Upload over serial using USART1
;    USART1_RX : PA10
;    USART1_TX : PA9
; set uC to boot mode with nboot=low on reset
[env:BB-STM32WL_serial]
build_flags = ${env.build_flags}
              -DNODE_ID=0x2
              -D PIN_SERIAL_RX=PA_10
              -D PIN_SERIAL_TX=PA_9

upload_protocol = serial
upload_port = /dev/ttyUSB0
upload_speed = 115200
monitor_port = /dev/ttyUSB0
monitor_speed = 115200

The So I can switch between the two devices for testing.

#80

ESP32 / Re: What board should I use?

Last post by LubOlimex - February 19, 2026, 01:00:47 PM

The relays of either MOD-IO and MOD-IO2 won't work if you power them from the UEXT. These are 5V relays and the UEXT can provide around 3.3V. So if you need the extra relays you'd have to split the power between the ESP32 board and the MOD-IO/MOD-IO2 power. Maybe consider these:

https://www.olimex.com/Products/Components/Cables/PWR-CABLE/
https://www.olimex.com/Products/Components/Cables/PWR-CABLE-HC-0-5M/

MOD-ENC28J60 should work but will require some software effort. If you have problems with throughput or configuration consider searching for an Ethernet module with a chip that is supported by espressif, like IP101, RTL8201, LAN87xx, DP83848, KSZ80xx. From the ESP32-C6 page:

https://docs.espressif.com/projects/esp-idf/en/stable/esp32c6/api-reference/network/esp_eth.html

Overall adding LAN is trickier than adding relays. My advice is to get a board with LAN and Ethernet connector and then add relays.