- Welcome to Olimex Support Forum.
Olimex Support Forum
Recent posts
#91
A20 / Re: update to Debian 12 (Bookw...
Last post by enok71 - July 31, 2025, 12:55:00 PMArmbian also has "unsupported"
bookworm based image for Lime2 with kernel version currently 6.12.
bookworm based image for Lime2 with kernel version currently 6.12.
#92
Biofeedback - EEG, ECG, EKG / Re: Gold cup electrodes for EE...
Last post by michaloblastni - July 30, 2025, 09:27:10 PMToday, my Ten20 conductive paste has arrived:
It works perfectly. However, I've tried two different tapes to attach the electrodes properly to skin and neither of the tapes was any good. Poorly attached electrodes have a distorted signal (i.e. weaker than it should be and unstable from a poor contact).
I've learned from medical resources that with Gold Cup Electrodes, Ten20 Conductive Paste is one of the most commonly used, and to position the electrodes on the scalp, they use the 3M Transpore™ Tape - 1 in. So, I had to order https://www.aliexpress.com/item/1005009400972477.html (from a different marketplace that's a local store).
I've also ordered the Nuprep gel to make 100% sure everything is professional and ready to work: https://bio-medical.com/nuprep-eegecg-skin-prep-gel-3-pack-of-4oz-tubes.html
Source: https://lifesync.com/blogs/blog/using-gold-cup-electrodes-for-eeg-monitoring-and-recording (medical article regarding EEG recording).
It works perfectly. However, I've tried two different tapes to attach the electrodes properly to skin and neither of the tapes was any good. Poorly attached electrodes have a distorted signal (i.e. weaker than it should be and unstable from a poor contact).
I've learned from medical resources that with Gold Cup Electrodes, Ten20 Conductive Paste is one of the most commonly used, and to position the electrodes on the scalp, they use the 3M Transpore™ Tape - 1 in. So, I had to order https://www.aliexpress.com/item/1005009400972477.html (from a different marketplace that's a local store).
I've also ordered the Nuprep gel to make 100% sure everything is professional and ready to work: https://bio-medical.com/nuprep-eegecg-skin-prep-gel-3-pack-of-4oz-tubes.html
Source: https://lifesync.com/blogs/blog/using-gold-cup-electrodes-for-eeg-monitoring-and-recording (medical article regarding EEG recording).
#93
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.
#94
A20 / Re: Old olinuxino a20 kernel i...
Last post by luimarma - July 30, 2025, 11:05:45 AMOK thanks
#95
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
#96
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
#97
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
#98
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).
#99
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.
#100
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.