ESP8266 Community Forum

- Fri Mar 25, 2016 7:44 am #43996 Hi all,

New to this forum and starting to play with the ESP8266.
I have bought 4 of those modules:
While starting playing with them, I used the flasher to load the latest firmware but I forgot to pull down GPio0 for flashing on the first 2. One the 3rd one, I did pull down GPio0 to gnd and all is ok, I can communicate with the module and run codes.

On the first 2 modules, every time now after powering up (from x attempts at flashing), the PC (Win10 x64), is seeing the COMx of the board, then gone, then back in an endless loop... while the blue led on the board flashes without stopping.

Those "bad" modules, I can flash alright while the GPio0 is down, I even tried flashing the INTERNAL://BLANK at every offset the flasher worked, but every time I restart the module... I am stuck in this endless loop of connect/disconnect/blue led flash!

If I power up the module after a BLANK flash, I don't see this connect/disconnect issue. But can't do anything with it...

What more can I try?

Thanks

Simon

- Fri Mar 25, 2016 9:45 am #44006 I just flashed the 4th module, same method, using the GPio0 down and flasher and latest firmware.

After power cycling the module, everything looked ok, but as soon as I tried to connect to the serial port using LuaLoader 0.91, I started to see connect/disconnect in cycles, non stop.

Pressing the reset button on the board stopped it, but trying to connect started the cycle again.

Looks like it may not be because I flashed without GPio0 to ground, but maybe bad modules? 3 out of 4?

Using same USB cable, PC, software and methods.

Could it be that the voltage is close to the limit?
1) Good module 3V pin reads: max 3.352v min 3.328v
2) Last bad module 3V pin reads: max 3.302v min: 3.284v
3) another bad module 3V pin reads: max 3.312v min 3.272v
4) last bad module (not even detected as com port anymore) max 3.292 min 3.268

The PDF spec state: Operating Voltage 3.0~3.6V
So I am in the range for all modules...

I see Vusb at 5.04 but the voltage regulator input at 4.65 (bad module) and 4.72 (good module)?

Hints anyone?

- Fri Mar 25, 2016 11:08 am #44013 Did some more testing... named all modules 1 to 4 and tested on 2 PC (Desktop, Laptop) both running Win10 x64 and same CH340 driver.

Here's the results!


So it seems those boards are quite sensitive to where we connect them. Board 4 does not seems to work, but I could flash it ok.

Thoughts?

- Fri Mar 25, 2016 9:34 pm #44043 Hi!

I Do have the same board as new. I got it last week. I'm still in the discovery phase of it. But I have been able to compile and load program into it with the ArduinoIDE. Well I am not answering your question, but I have one of my own four you. I don't know if you are from France or Quebec, but I would guess you speak french. Would you like to add me on facebook since I cant seemt o be able to send private message on this forum when I click on your profile? It would be nice to have a partner to discover this board. It's hard to getting started and it's kinda long before having an answer on the forum.

Facebook: https://www.facebook.com/PiKaLeX666