- Welcome to Olimex Support Forum.
Olimex Support Forum
Recent posts
#51
SHIELDS / SHIELD-EKG-EMG Troubleshooting
Last post by kakovalipuduk - April 14, 2024, 06:37:44 PMHello, I recently bought the SHIELD-EKG-EMG shield to use on my arduino uno r4 wifi. Without the use of any library utilization I tried to read the analog input from the boards as suggested by the page 8 of this pdf(https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-2560/resources/Olimex2560-EKG.pdf) however even without putting the electrodes on anything I get the same analog reading of 302 and the serial plotter doesn't show anything meaningful. Please help.
#52
ESP32 / Specs and features of the char...
Last post by BenIndustries - April 12, 2024, 06:21:08 PMHi everyone - hope you're project are going well!
We're using the ESP32-DevKit-Lipo Rev. D - Olimex part# 93658. Can anyone provide information on the charging circuit of this board? We're using 18650 LiPo batteries (usually 3200 mAh versions) to power our device and we're keen to know how well featured the charging circuit is. Does it provide any bms functionality (overcharge, low voltage protection) or other protection or should we specify protected 18650 batteries with their on bms or fuse protection as well?
Thanks in advance for any insight.
RK
We're using the ESP32-DevKit-Lipo Rev. D - Olimex part# 93658. Can anyone provide information on the charging circuit of this board? We're using 18650 LiPo batteries (usually 3200 mAh versions) to power our device and we're keen to know how well featured the charging circuit is. Does it provide any bms functionality (overcharge, low voltage protection) or other protection or should we specify protected 18650 batteries with their on bms or fuse protection as well?
Thanks in advance for any insight.
RK
#53
TERES DIY Laptop / Re: TERES 1 is dead?
Last post by DiTBho - April 11, 2024, 01:12:55 PMIt appears that interest is close to zero
Therefore, not dead yet, but walking dead
Therefore, not dead yet, but walking dead
#54
Neo6502 / Re: Neo6502 - hdmi problem, do...
Last post by LubOlimex - April 11, 2024, 08:22:36 AMThe chances of defective board are zero. We test each board extensively and there is also an empirical with HDMI monitor.
How are the jumpers set?
Did you change video input medium on the monitor via the settings or the remote? Not sure if video resolution can be a problem but maybe try to check that too.
Can it be too long cable? Maybe try with shorter cables.
Some monitors might refuse to work with the Neo, make sure to join the Facebook group for the board and check similar discussions, there are few people mentioning similar compatibility problems, the Facebook group is here:
https://www.facebook.com/groups/745798620676673
Here is filtered results with "HDMI" in search box, I see few results of people reporting problems with some monitors and displays that won't sync with VGA:
https://www.facebook.com/groups/745798620676673/search/?q=hdmi
How are the jumpers set?
Did you change video input medium on the monitor via the settings or the remote? Not sure if video resolution can be a problem but maybe try to check that too.
Can it be too long cable? Maybe try with shorter cables.
Some monitors might refuse to work with the Neo, make sure to join the Facebook group for the board and check similar discussions, there are few people mentioning similar compatibility problems, the Facebook group is here:
https://www.facebook.com/groups/745798620676673
Here is filtered results with "HDMI" in search box, I see few results of people reporting problems with some monitors and displays that won't sync with VGA:
https://www.facebook.com/groups/745798620676673/search/?q=hdmi
#55
Neo6502 / Re: Neo6502 - hdmi problem, do...
Last post by weirdocollector - April 10, 2024, 07:43:10 PMHi!
I've got the very same problem: can't get an image from the HDMI connector of my NEo6502.
I've tried the following:
- use an HDMI2VGA adaptor on a VGA monitor
- connect directly to an HDMI monitor
- flash the apple2_800x600_400MHz.uf2 fw
- flash the firmware_usb.uf2 fw
I all the above cases, I'va also connected a USB keyboard, the Neo6502 emits a beep but no image is displayed.
Any other suggestion ?
Could my Neo be defective ?
I've got the very same problem: can't get an image from the HDMI connector of my NEo6502.
I've tried the following:
- use an HDMI2VGA adaptor on a VGA monitor
- connect directly to an HDMI monitor
- flash the apple2_800x600_400MHz.uf2 fw
- flash the firmware_usb.uf2 fw
I all the above cases, I'va also connected a USB keyboard, the Neo6502 emits a beep but no image is displayed.
Any other suggestion ?
Could my Neo be defective ?
#56
ESP32 / Re: ESP32-POE-ISO Strapping pi...
Last post by LubOlimex - April 10, 2024, 08:42:09 AMGPIO15 is not a strapping pin.
GPIO0 is strapping pin and if pulled up at reset the board won't enter download mode. Meaning you can't reprogram the board. Notice that GPIO0 has internal pull up, not sure why you need external one.
Overall I would recommend NOT using GPIO0 but another GPI or GPIO pin instead. GPIO0 is a very special pin and I wouldn't recommend changing its pull ups or pull downs. Since you need input, I'd recommend one of the pins that are only inputs like GPI35 or GPI36.
You need to read the ESP32 datasheet and any notes about GPIO0 and GPIO15.
https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
GPIO0 is strapping pin and if pulled up at reset the board won't enter download mode. Meaning you can't reprogram the board. Notice that GPIO0 has internal pull up, not sure why you need external one.
Overall I would recommend NOT using GPIO0 but another GPI or GPIO pin instead. GPIO0 is a very special pin and I wouldn't recommend changing its pull ups or pull downs. Since you need input, I'd recommend one of the pins that are only inputs like GPI35 or GPI36.
You need to read the ESP32 datasheet and any notes about GPIO0 and GPIO15.
https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
#57
ESP32 / ESP32-POE-ISO Strapping pins
Last post by Cesarpuig - April 09, 2024, 09:02:07 PMHello.
On an ESP32-POE-ISO-EA-16MB board.
On the ESP32 GPIO0 and GPIO15 are strapping pins. Could I have problems if I install an external 10k pull up resistor in both of them? I want to use them as inputs through an optocoupler and I want to install external resistors.
Greetings and thank you
On an ESP32-POE-ISO-EA-16MB board.
On the ESP32 GPIO0 and GPIO15 are strapping pins. Could I have problems if I install an external 10k pull up resistor in both of them? I want to use them as inputs through an optocoupler and I want to install external resistors.
Greetings and thank you
#58
A20 / Re: Olimex A20-SOM interfacing...
Last post by LubOlimex - April 09, 2024, 08:58:15 AMWe use KSZ9031 in our designs, maybe look for the definitions for KSZ9031 in the Linux sources and adjust definitions and settings for your KSZ8563.
https://www.microchip.com/en-us/product-comparison.KSZ8563.ksz9031
Also check here:
https://microchip.my.site.com/s/article/An-Overview-of-Linux-Drivers-for-KSZ-Switch-Families
It says that you should use ksz9563 device tree for ksz8563.
https://www.microchip.com/en-us/product-comparison.KSZ8563.ksz9031
Also check here:
https://microchip.my.site.com/s/article/An-Overview-of-Linux-Drivers-for-KSZ-Switch-Families
It says that you should use ksz9563 device tree for ksz8563.
#59
A20 / Olimex A20-SOM interfacing KSZ...
Last post by mavstuff - April 08, 2024, 04:40:32 PMHi everybody!
Has anybody tried to connect Microchip KSZ8563 PHY to Olimex A20-SOM board? I am not able to get it to work.
Any information appreciated
Has anybody tried to connect Microchip KSZ8563 PHY to Olimex A20-SOM board? I am not able to get it to work.
Any information appreciated
#60
A20 / Re: Calibrate Touchscreen
Last post by vrendtop - April 08, 2024, 12:27:24 PMI forgot to mention that I use an A10 with an updated buster, because I didn't get an answer on the A10 forum ...