[ESP8266][ESP-07] Is the program preloaded at the factory? LED does not light up.

I own a module as per the topic. I have never used it so far. When I connect it to the power supply, does it execute some program uploaded by the manufacturer? There are two LEDs on it, but neither is lit. The module does not respond to AT commands, I checked on different speeds.
I have connected according to this description:
Link .

Usually, there is a soft interpreting AT command uploaded. Maybe you have the interface speed set incorrectly, or you don't add CR+LF at the end?

When 3.3V is applied, a red LED should light up, even if nothing else is connected and there is no software uploaded.

khoam wrote:

Set the speed in the serial terminal to 74880,

.
Rather 76800.

tmf wrote:

There is usually a soft upload that interprets AT commands. Maybe you have the interface speed set incorrectly, or you don't add CR+LF at the end?

.

I have tried at different speeds. It doesn't always respond. Mostly on 9600 I think, but always some sort of screaming.

Added after 55 [seconds]: .

khoam wrote:

Is a new WiFi network appearing with a name of type ESP_xxxxx?

.

No new network appears.

khoam wrote:

It looks like the flash is cleared. The only thing you can do in this situation is to try uploading AT firmware.

.

Unfortunately the flashing program cannot connect to the module. The message "Timed out waiting for packet header" appears.

khoam wrote:

What flashing program are you using? What are its settings?

.

ESP8266 DOWNLOAD TOOL V3.6.8. from the Espressif website.
So far I haven't selected files, I just have the following set up:
COM8, 115200
CrystalFreq: 26M,
SPI SPEED: 40MHz,
SPI MODE: QIO,
FLASH SIZE: 8Mbit.

khoam wrote:

Is GPIO 0 shorted to ground during flashing?

.

Yes.
I do not have RST and GPIO16 connected. CH_PD directly to the power supply (I shorted a resistor because it makes no difference). Similarly GPIO15 directly to ground. GPIO0 and GPIO2 without pull-up resistors to Vcc. GPIO2 directly to GND. Another difference is that the ground of the converter and the module are not connected.

khoam wrote:

The weights of both systems should be connected.

I have connected the masses, no change. I will add the resistors later, as I already have enough for today. I come across different wiring diagrams and I don't know which is the right one. Sometimes instead of a time out it says "Invalid head of packet ('xyz')", where "xyz" is different.

I added all the resistors and even a capacitor to the RST, but nothing changed. Maybe this module is faulty.

khoam wrote:

Have you disconnected GPIO 2 from ground? Does the module also not respond when you connect the serial terminal to it?

.
GPIO2 wasn't connected to GND, it was connected to Vcc via a resistor as shown in the schematic. It's the same when I tried to connect via the terminal with the Arduino IDE and RealTerm.

.

Did you connect 5V or 3.3V to VCC? This board has the possibility to solder a 3.3V regulator on the back and you can then connect 5V to the VCC pin (max depends on which regulator), but you have to remove the resistor R2 - 0 (jumper). For ESP07 programming on this board you can use the part from the ESP module Witty, the bottom part of the sandwich fits perfectly, but then you have to solder this regulator and remove the jumper, Witty gives 5V on VCC.
Did the red led start to light up for you when power was applied? The blue one should flash when power is applied or when you do a reset, it's a sign that something is sending to the UART on that 74k speed.
76k or 74k is also so moderately relevant to the UART, I have in the Arduino IDE one speed, in my program the other, both work OK.
Another thing, for normal commissioning you don't need to add anything in this board, all the resistors required for normal operation are already on the board, some inside the ESP07 and the rest on the adapter. For programming, all you need to do is short pin 0 to GND and then do RST, disconnect pin0, upload the program (3.3V logic level of course), then RST again or reconnect the power supply and it should work. The adapter from Witty does this automatically (RST, programming mode, operating mode) when the target board in the Arduino IDE is for example this one:
.

I also have a 74k in my Arduino and it works. But 76k also works:
.
Both speeds work in realtherm too, although in turn this software does not support either:
.
.
Maybe the difference is too small to be relevant to the occurrence of errors, maybe the uart converter doesn't give a damn what it is set to and chooses the closest possible one, well that would be acutely inconsistent with what you wrote, because the CP2102 that I have now connected supports just 76800 You have to check on FTDI, this one has a larger range and see when something cries out, but that's if someone is very curious and determined (CH34x also has 76800).

kaczakat wrote:

Did you connect 5V or 3.3V to VCC?

.
I supply the board with 3.3V. I also switched the USB/USART converter to 3.3V, but I did not let the power from it go to the contact board. I took power from an external power supply and a power module for the contact board. I'm just wondering if, with the converter set to 3.3V, this is also the voltage level on its signal lines.
As I wrote earlier, none of the LEDs on the ESP-07 module are lit.

khoam wrote:

Can you measure what the voltage is directly on the ESP-07 pin? Marked, as VCC on the picture below.

.
Thanks khoam. Good clue. I must have soldered the Vcc pin of the adapter wrong. As I pressed it harder with the multimeter tip, the red LED on the module started to light up. I always have a problem with soldering.

khoam wrote:

Well from the photo you posted earlier it looked like cold solder, but I didn't want to criticise you so immediately

.
However, you should have:) .
I'll correct this tomorrow and re-call the rest of the connections just to be sure.
There is hope that I have not rammed the module.