NodeMcu V.3 vs. "bare" ESP8266-12 - launching ESPEasy

Hello
I wanted to design my own board with ESP8266. First I wanted to check if on this version ( version 12 with antenna socket and antenna ).
I connected according to the schematic below
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During programming I shorted GPIO0 to Gnd, then Reset and with ESPEasy Flasher I uploaded the file ESPEasy_v2.0.0-dev12_normal_4096,bin.

Later I disconnected GPIO0 and reset, a new network should appear, but I wait several minutes and nothing.

I've looked at the NodeMcu schematic and the only difference I can see is that there is no 10K resistor on GPIO2 on mine. AND that GPIO15 is shorted directly to Gnd on mine and not via a resistor. Before I start cutting GPIO15 off from Gnd ( I have it all on a board with a 2.0mm raster connector ) I wanted to ask if, according to my colleagues, this should work, or does this version of the module require a different batch ?

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I have reviewed the NodeMcu schematic and the only difference I can see is that I have no 10K resistor on GPIO2. and that GPIO15 is in my case shorted directly to Gnd and not via a resistor

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This does not play a role. If GPIO15 is not used as an output then you can connect directly from GND.

maximus22_kr wrote:

First I wanted to check that on this version ( version 12 with antenna socket and antenna ).

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The ESP-12 has the antenna on the PCB and the ESP-07 has the antenna on the PCB + antenna connector.

If you have an ESP-07 then upload the soft ESPEasy_v2.0.0-dev12_normal_1024bin

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If you have ESP-07 then upload the soft ESPEasy_v2.0.0-dev12_normal_1024bin

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and this is the solution to the problem. I saw a version listing somewhere and the larger version with antenna and antenna slot had a flash of 4M

Now I have:
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Well it just remains to choose a GPIO that is "safe" to use. To me it seems that :
GPIO4, GPIO5 - I2C
GPIO2 - DS18B20
GPIO12 - DHT22
GPIO13, GPIO14, GPIO15, GPIO16 - buttons ( possibly MAX6675 ) , I don't know how about GPIO15

Regarding this version with antenna on PCB, I tried to play different versions to it and I always have:
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GPIO15 only needs to be in the L state at reset , and then it can be used freely.

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When it comes to this version with the antenna on the PCB, I tried to play different versions to it and I always get:

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Stack error means that these addresses do not exist.

The schematic is correct, so this is unlikely to be the cause of the error.
Even if the module has a 4M flash, it should work if the 1M version is uploaded, the other way round there may be some problems.

Regarding GPIO selection, if there is a nodemcu firmware there is a note on the page:

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[*] D0(GPIO16) can only be used as gpio read/write. No support for open-drain/interrupt/pwm/i2c/ow.

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But I don't know if it's just this firmware that has it that way, or if it's some limitation of the ESP8266 (I didn't go into it because I didn't need it).

Quote:

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Regarding the GPIO selection, if there is a nodemcu firmware on the page there is a note like this:

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[*] D0(GPIO16) can only be used as gpio read/write. No support for open-drain/interrupt/pwm/i2c/ow.


But I don't know if it's just this firmware that has it that way, or if it's some limitation of the ESP8266 (I didn't go into it because I didn't need it).

I tested this practically, the DS18B20 thermometer did not work on this GPIO, neither did the DHT. It will serve as a possible input/output, although I intend to use the PCF8574 for this purpose ( I don't have the MCP230117, only the MCP23016 version on I2C - just that there isn't room for that many inputs/outputs in the setup - 12 max)

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GPIO15 only needs to be in the L state at reset, after that it can be used freely.

that's good to know, I'll put a jumper on the PCB in case I have to reset manually

As for the ESP8266 version with the antenna on the PCB, the same error persists, I've tried uploading older versions ( e.g. R120 ) but nothing either. I only have two of these, the rest are versions with antenna and socket, so no problem, I will upload traditional soft to them.

If GPIO15 in normal operation has an output function then even the jumper should not be directly connected to GND but via a resistor e.g. 3.3k. Otherwise a short-circuit may occur after programming (when the pin sends a high level):