Search found 12 matches

by CraigUK
Sat Feb 16, 2019 9:44 am
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

Re: [Solved] NodeMCU boot loop after fresh install

Thanks, that would be useful information
by CraigUK
Sat Feb 16, 2019 8:26 am
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

Re: NodeMCU boot loop after fresh install

This morning I tried another board from the same batch. It comes with lua installed so before flashing micropython onto it I tested it with lua: same behavior. The board continuously resets out of the box. So I've wasted rather a lot of time on a faulty batch of boards. I really kicked myself when I...
by CraigUK
Fri Feb 15, 2019 10:03 pm
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

Re: NodeMCU boot loop after fresh install

Hi Phil, Here's my esptool command and output: C:\Users\craig>esptool.py -p COM3 -b 115200 write_flash -fm dio --verify --flash_size detect 0 "Downloads\esp8266-20190125-v1.10.bin" esptool.py v2.6 Serial port COM3 Connecting.... Detecting chip type... ESP8266 Chip is ESP8266EX Features: WiFi MAC: 60...
by CraigUK
Thu Feb 14, 2019 4:08 pm
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

Re: NodeMCU boot loop after fresh install

Thanks for the tip Phil.

I flashed with the -fm dio option, also with 115200 baud.

Am I right to assume that since the flash write is verified then the problem is not with the flashing?
by CraigUK
Wed Feb 13, 2019 10:41 pm
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

Re: NodeMCU boot loop after fresh install

I hoped it was something simple or a known issue but I suppose not.
by CraigUK
Tue Feb 12, 2019 9:21 pm
Forum: ESP8266 boards
Topic: [Solved] NodeMCU boot loop after fresh install
Replies: 8
Views: 302

[Solved] NodeMCU boot loop after fresh install

Hi All, I have a new NodeMCU which has a problem after flashing micropython 1.10 onto it. The repl appears and responds for a short time (<1s) but then is unresponsive, i.e. nothing I type is echoed back to the terminal. After about 8s then mcu is reset by the hardware wdt and the process begins aga...
by CraigUK
Tue Jan 22, 2019 9:46 am
Forum: MicroPython pyboard
Topic: ADC simultaneous sampling?
Replies: 9
Views: 398

Re: ADC simultaneous sampling?

You might consider the ADC.read_timed_multi method. This was intended for exactly this purpose, it produces good phase measurements at frequencies over 50KHz. The sampling isn't simultaneous but relative to 50Hz it's extremely close. Thanks for this, I don't know why I didn't find this myself in th...
by CraigUK
Fri Jan 18, 2019 10:15 pm
Forum: MicroPython pyboard
Topic: ADC simultaneous sampling?
Replies: 9
Views: 398

Re: ADC simultaneous sampling?

dhylands wrote:
Fri Jan 18, 2019 6:53 pm
You might be able to get something to work by tweaking the ADC registers directly using the stm module.
That sounds interesting.
A quick google brought me here: http://wiki.micropython.org/platforms/b ... ard/modstm
Am I looking in the right place?

Thanks
Craig
by CraigUK
Thu Jan 17, 2019 9:12 pm
Forum: MicroPython pyboard
Topic: ADC simultaneous sampling?
Replies: 9
Views: 398

ADC simultaneous sampling?

Hi all,

I'd like to measure the phase of a 50Hz ac waveform relative to another.
I think that simultaneous sampling would be the best way to do that which the MCU on the pyboard supports.

Is there any support for this feature?
If not, is there another way to acheive it?

Thanks,
Craig
by CraigUK
Mon Jan 14, 2019 4:19 pm
Forum: Other Boards
Topic: Looking for a board with 16 ADC channels and WiFi
Replies: 8
Views: 424

Re: Looking for a board with 16 ADC channels and WiFi

I'll be investigating the ads devices further but will be looking into the PYBD in due course.

Thanks all!