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#91
ESP32 / Re: ESP32-DevKit-Lipo Power Sw...
Last post by LubOlimex - July 30, 2025, 11:58:35 AMSure you can do that, it is just not very elegant and no way to tell when battery is charged. Using the external power sense and battery measurement you can have some feedback on what is connected when and when battery is going empty or full then trigger events.
#92
A20 / Re: Old olinuxino a20 kernel i...
Last post by luimarma - July 30, 2025, 11:05:45 AMOK thanks
#93
Biofeedback - EEG, ECG, EKG / Re: Gold cup electrodes for EE...
Last post by michaloblastni - July 29, 2025, 04:28:53 PMLubOlimex: Today, my OpenBCI kit has arrived:
https://www.aliexpress.com/item/1005002683152100.html
I found they sell only one electrode, one wire, one spring, ... for this price.
So, when you need 4 electrodes you have to buy this kit 4 times. Since only 1 electrode arrived, I cannot do the experiments yet. I've just ordered the remaining electrodes.
Btw. I've developed what's possibly the first EEG-SMT Android app: https://www.olimex.com/forum/index.php?topic=9867.0
https://www.aliexpress.com/item/1005002683152100.html
I found they sell only one electrode, one wire, one spring, ... for this price.
So, when you need 4 electrodes you have to buy this kit 4 times. Since only 1 electrode arrived, I cannot do the experiments yet. I've just ordered the remaining electrodes.
Btw. I've developed what's possibly the first EEG-SMT Android app: https://www.olimex.com/forum/index.php?topic=9867.0
#94
ESP32 / Re: ESP32-DevKit-Lipo Power Sw...
Last post by wezzer - July 29, 2025, 12:27:20 PMHi. Thank you for responding.
I was probably not expressing very clearly what I was trying to achieve, I am building a device that has the ESP32-DevKit-Lipo at its core. It has an external usb power supply which will be connected only when required to charge the LiPo battery.
As this unit will be used for a few hours at a time and then put away I am hoping to charge the LiPo battery whilst connected to the usb after the device has been used and then remove the usb connection leaving the battery fully charged for the next use which will be away from any external power source.
I have very little experience of using LiPo batteries and so wanted to know whether by inseting an latching switch in the LiPo positive lead I could turn the ESP32 off in storage and so keep the LiPo battery fully charged ready for the unit's next use.
As stated before, I accept that the new switch will need to be on in order to recharge the LiPo battery when the unit is powered from the USB lead.
This unit may well be left off for a number of weeks between uses.
Thanks for your help,
Wezzer
I was probably not expressing very clearly what I was trying to achieve, I am building a device that has the ESP32-DevKit-Lipo at its core. It has an external usb power supply which will be connected only when required to charge the LiPo battery.
As this unit will be used for a few hours at a time and then put away I am hoping to charge the LiPo battery whilst connected to the usb after the device has been used and then remove the usb connection leaving the battery fully charged for the next use which will be away from any external power source.
I have very little experience of using LiPo batteries and so wanted to know whether by inseting an latching switch in the LiPo positive lead I could turn the ESP32 off in storage and so keep the LiPo battery fully charged ready for the unit's next use.
As stated before, I accept that the new switch will need to be on in order to recharge the LiPo battery when the unit is powered from the USB lead.
This unit may well be left off for a number of weeks between uses.
Thanks for your help,
Wezzer
#95
New Products release / Secure boot now available for ...
Last post by olimex - July 29, 2025, 12:02:26 PMIf you need Secure Boot for STM32MP157 , we got you covered with STMP157-SOM-512-SB and STMP157-OLinuXino-LIME2H-SB now featuring STM32MP157FAA1 extended temperature range -20+105C running at 800Mhz and secure boot https://olimex.wordpress.com/2025/07/29/we-can-now-offer-version-of-smt32mp157-boards-with-secure-boot-and-aes256/ #stm32mp157 #secure #boot #trustzone
#96
A20 / Re: Old olinuxino a20 kernel i...
Last post by LubOlimex - July 29, 2025, 08:41:47 AMI have no idea what is this file, even if there was one, it is probably gone by now.
If your board has eMMC download the A20_OLinuxino_Micro_debian_Jessie_34_103_2G_eMMC_release_18.zip archive, extract it prepare an SD card with it, boot and type ./emmc.sh - this will install the Linux image to the eMMC.
It is quite likely that the release above does what you want (e.g. boots from SPI then transfers the boot process to eMMC).
If your board has eMMC download the A20_OLinuxino_Micro_debian_Jessie_34_103_2G_eMMC_release_18.zip archive, extract it prepare an SD card with it, boot and type ./emmc.sh - this will install the Linux image to the eMMC.
It is quite likely that the release above does what you want (e.g. boots from SPI then transfers the boot process to eMMC).
#97
Biofeedback - EEG, ECG, EKG / Re: New Linux application for ...
Last post by michaloblastni - July 29, 2025, 03:50:02 AMHere is an Android support for EEG-SMT:
https://github.com/michaloblastni/local-neural-monitoring-android/tree/main
I've also tried ECG to prove the visualization works correctly. Both channels were tested.
This is an alpha version for developers. You may use it, but it's not perfect, yet.
https://github.com/michaloblastni/local-neural-monitoring-android/tree/main
I've also tried ECG to prove the visualization works correctly. Both channels were tested.
This is an alpha version for developers. You may use it, but it's not perfect, yet.
#98
Neo6502 / Re: About Apple II emulator an...
Last post by Ralf - July 28, 2025, 11:07:30 PMYou might want to google a tool that can read and write into apple2-disk-images.
#99
Neo6502 / Re: Problems reading USB drive...
Last post by Ralf - July 28, 2025, 10:42:27 PMQuote from: stingrayce1982@gmail.com on July 28, 2025, 12:32:32 AMI'm not seeing any messages that would show that the NEO6502 has recognized the USB drive(key).
That message actually only appears when using the Morpheus firmware.
You probably want to use the firmware and disk image in this zip-file:
https://ftp.olimex.com/Neo6502/blank_disk_for_apple2e_code_development_apple2e_ProDOS_2_4_3.zip
Reflash the Neo6502 with the apple2e.uf2 and put the pro-dos-image in the root directory of your USB key.
On boot of the neo6502 that disk image will then be mounted as S7,D1 and is writable.
Cheers
#100
Biofeedback - EEG, ECG, EKG / New Linux application for EEG-...
Last post by michaloblastni - July 28, 2025, 08:45:34 PMI've created a Linux port of the Local Neural Monitoring application for EEG-SMT:
https://gist.github.com/michaloblastni/08534a2bfb258f35e1bfebf73c34efaf
It's tested on Ubuntu 24.02 LTS.
You may find it easy to extend. The license is MIT, so you can integrate this code into both personal and commercial projects.
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Android Support?
Do you think EEG-SMT can be plugged into a USB OTG adapter, connected to an Android phone, and an Android app will then be able to nicely read EEG data from it?
One low-level app for a PoC is https://play.google.com/store/apps/details?id=de.kai_morich.serial_usb_terminal I wonder if someone has tried running it on Android.
It works!
Since the PoC has been successful, I can develop an Android app for Local Neural Monitoring.
Note: My ADUM3160 USB isolator doesn't work in USB OTG mode. That said, connecting the EEG-SMT directly to a smartphone doesn't pose any safety risk of electrocution since USB OTG has only 5 volts.
https://gist.github.com/michaloblastni/08534a2bfb258f35e1bfebf73c34efaf
It's tested on Ubuntu 24.02 LTS.
You may find it easy to extend. The license is MIT, so you can integrate this code into both personal and commercial projects.
----------------------------------------------------------------------
Android Support?
Do you think EEG-SMT can be plugged into a USB OTG adapter, connected to an Android phone, and an Android app will then be able to nicely read EEG data from it?
One low-level app for a PoC is https://play.google.com/store/apps/details?id=de.kai_morich.serial_usb_terminal I wonder if someone has tried running it on Android.
It works!
Since the PoC has been successful, I can develop an Android app for Local Neural Monitoring.
Note: My ADUM3160 USB isolator doesn't work in USB OTG mode. That said, connecting the EEG-SMT directly to a smartphone doesn't pose any safety risk of electrocution since USB OTG has only 5 volts.