8000 esp8266: REPL hangs after UART initializing · Issue #3763 · micropython/micropython · GitHub
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esp8266: REPL hangs after UART initializing #3763

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alessss opened this issue May 5, 2018 · 6 comments
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esp8266: REPL hangs after UART initializing #3763

alessss opened this issue May 5, 2018 · 6 comments
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port-esp8266

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@alessss
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alessss commented May 5, 2018 •
edited by dpgeorge
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Hello!
I'm trying to read mhz19 co2 sensor data using ESP12F with micropython.

My pins are connected as following:
MHZ19 ESP
GND --> GND
Vin --> Vin
Tx --> Rx
Rx --> Tx

Console hangs directly after connecting (screen /dev/cu.wchusbserial14340 115200) giving following output:

��'�ng�l��d�l��l$������d�g����cll�;x���cl�#{$s$s�'�����g����c��$�d���cl���<cd`��lg�p;l�l��|��{�#4 ets_task(40100130, 3, 3fff837c, 4)
OSError: [Errno 2] ENOENT

MicroPython v1.9.3-8-g63826ac5c on 2017-11-01; ESP module with ESP8266
Type "help()" for more information.
>>>

Firmware without mhz19 sensor works well. What's the problem with the port?
@robert-hh
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If you connect something else to RX and TX, you'll have a collision with the console, which is also connected to RX and TX. The collision is both for the electrical signals and the protocol, In this case, the mh-z19 sensor requires a setting of 9600 baud, whereas the console is using 115200 baud.
I faintly remember some discussion of setting the console to webrepl only, but could not find that any more.

@dpgeorge
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dpgeorge commented May 7, 2018

The UART on esp8266 is currently only available for the REPL and can't be used for other things.

@dpgeorge dpgeorge changed the title REPL hangs after UART initializing esp8266: REPL hangs after UART initializing May 7, 2018
@alessss
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alessss commented May 7, 2018

http://micropython.org/webrepl/ - can webrepl help me in my case?

@dpgeorge
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dpgeorge commented May 8, 2018
  • can webrepl help me in my case?

Not until it's possible to disable the REPL on the UART; see #3277 for some code which does this.

@frestr frestr mentioned this issue May 10, 2018
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@dpgeorge
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It's now possible to disable the REPL on UART(0) on the esp8266, see afd0701.

@johnwebsiteprojects
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i just hoped i saw this solution before frying my chip

http://micropython.org/webrepl/ - can webrepl help me in my case?

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