ESP8266 Community Forum

Hi,
I would like to ask for some help… as I am new in this platform and declaring myself stupid… not been able to run a single sketch in Arduino.
What is happening, is that after upload a sketch (normally he wify Scan or the blink), when I press reset, I cannot see anything in the serial, and after a couple of seconds, the WDT resets the chip…
IF I try the uploading the same sketch with the ModeMCU board (V1.0 or V0.9) everything works perfectly.
So that’s the boards:
-I have around several ESP-12E, adquired in different moments of time (Ebay, DealExtreme and Bangood), so I marked them with letters, so I have
--Batch A: 10 units (tested around 5)
--Batch B: 2 Units (Tested 2)
--Batch C: 1 Unit (Tested 1)
--Bath D: 2 Units (not tested yet)
--Two ModeMCU V1.0 (samples tested and working properly)
--Two ModeMCE V0.9 (Samples tested and working Propoerly)
-Most of them (batch A and B) has 100uF Electrolytic capacitor for the spikes and ceramic capacitor for filtering (I also have some ESP-12E with the electrolic capacitor soldered to VCC and GND.
-I rely on the power supply (see pictures) as it can deliver a couples of amps without problem.
-I did not tested the power supply with the oscilloscope (TO-DO)
-Trials done on Windows 7, 10 and XP using Arduino v1.8.2(portable, non-administrator mode) and ESP Arduino core V2.3.0 (I also tried with the V2.2.0)


I am almost one month trying different circuits and connections: wires, solderless breakout boards and finally soldered breakout boards, alqays with the same. The latest one is the one bellow.
Its following the ModeMCU v0.9… with only one resistor for pulling-up/down (15k resistor… the ones that I has around) …. I realised that for the ModeMCU v1.0 there are a low ohm resistor before the gGND/VCC (don’t know the reason)
PHOTOS OF MY SETUP
I also added bouncing capacitor to the reset button.

The modules work perfectly before flashing them with Arduino, they are responsive to the AT commands. For example, here bellow some info before and after uploading the Arduino Sketch:



Then, In the arduino I select te Board ModeMCU V1.0 (ESP-12E) (I also Tried with ModeMCU V0.9), and I got this:


After flashing, they enter in the WDT reset loop,


I can reprogram them, also I can flash the AT firmware and they work properly, So I discard a corrupt eeprom, I mean, the ESP bootloader is responsive.

The sequence that I am following is the next.


I also tried inverting 5 and 6. Maybe I am doing something wrong in this sequence. Is there any additional configuration on the Arduino?

Also, sometimes, when I choose the generic ESP8266 board, I play with the options, and it happens that when I am uploading the sketch it get stuck in the last bar:



And again, after I reset… WDT reset Loop:


Any tip, indication, help or guidance will be more than welcome… What I am doing wrong??
Thanks a lot for your support.

Regards.

I have a ESP-01.
https://www.hackster.io/ROBINTHOMAS/programming-esp8266-esp-01-with-arduino-011389 works for me

Confirm with a meter that GPIO15 is pulled low. GPIO0 and GPIO2 are at a high level. That Reset and CH_PD are both high.

I don't use a momentary switch on GPIO0 to switch between modes. I use either a jumper pin (shorted for programming) or a latching push button switch. When the boot loader finishes loading the code it executes it and it doesn't matter that GPIO0 is still low. (unless I am using it in the current program)

Many of my boards are soldered on the same crappy white boards you are using. But I have an on board regulator along with additional capacitors on it. I have never used those boards with an external 3.3 volt supply.

I have had problems with some regulators even when they were soldered to the back of those boards. It would work often but I would get crashing problems. It was only after I brought them to work and scoped the power pin on the module did I find there was a glitch on the power line. The glitch was causing crashing problems.

I am concerned about using large value electrolytic capacitors to provide the surge current. They often have to high an impedance at high frequencies. I use a multi stage approach. 0.1uF in parallel with a 10uF ceramic cap in parallel with a 68uF tantalum cap. All as close as possible to the Vcc and gnd pins on the module.

See viewtopic.php?f=6&t=11068&start=4

With your setup I would take a module and solder a tantalum cap from the Vcc pin and the negative of the cap soldered right onto the metal shield of the module. It is a ground point. I would keep the wire length of the cap as short as possible. That's what I would do, but the -ve wire of the cap soldered to the gnd pad should do.

I just use the generic setup. 4M with 1M SPIFFS, QIO, flash freq 40Mhz, CPU freq 80MHz.

Load the blink sketch. Have that run for a while.

I can reprogram them, also I can flash the AT firmware and they work properly,

That makes me think it would be a wrong configuration problem when programming with an Arduino sketch.