ESP8266 Community Forum

Posted: **Fri Feb 05, 2016 7:53 am**

I've just brought a esp8266 chip which connected to the CH340 Chip. However, after i finished downloading the firmware to the chip and disconnect GPIO0 to ground. My computer cannot find any COM port that connected to the chips. But if I reconnect the GPIO0 to the GND, the COM Port is back immediately.
My connections In flashing mode are :

RXD --> TXD
GPIO0 --> GND
GPIO2 --> Floating
GND --> GND
VCC --> VCC
RST --> Floating
CH_PD --> VCC
TXD --> RXD

In normal operation mode my connections are :

RXD --> TXD
GPIO0 --> Floating
GPIO2 --> Floating
GND --> GND
VCC --> VCC
RST --> Floating
CH_PD --> VCC
TXD --> RXD

Also, i connected a 10uF capacitor to the VCC and the GND. So, what is the problem of the connections or the chips?

Posted: **Fri Feb 05, 2016 11:38 am**

My experience with windows ,,, the port you load fw will be the same for normal usage, unless for some reason you are plugging into usb socket...ie the PORT X is dependant on where your usb converter is plugged not the ESP

What FW did you load??? ie
I use ESPlorer to monitor serial + more
on ESPlorer I close PORT X
I Ground IO0 press reset download using PORT X -- I prefer ESP DOWNLOAD TOOL V2.4
When down load complete and PORT X released UNGROUND IO0
I open PORTX ESPlorer at desired Baud usually 9600-Nodemcu/Lua or 115200-Arduino
press reset ,, should see boot info

Posted: **Fri Feb 05, 2016 4:16 pm**

RXD --> TXD
GPIO0 --> GND - For flash, but for runing must be pullup resistor to Vcc!!
GPIO2 --> Floating - Bad, must be pullup resistor to Vcc!!
GND --> GND - GND CH340 Chip + GND powe r+ GND ESP8266
VCC --> VCC - Vcc Esp8266 +Vcc Power only!!
RST --> Floating - Bad, must be pullup resistor to Vcc!!
CH_PD --> VCC
TXD --> RXD

Posted: **Sun Feb 07, 2016 12:06 am**

xtal wrote:My experience with windows ,,, the port you load fw will be the same for normal usage, unless for some reason you are plugging into usb socket...ie the PORT X is dependant on where your usb converter is plugged not the ESP

What FW did you load??? ie
I use ESPlorer to monitor serial + more
on ESPlorer I close PORT X
I Ground IO0 press reset download using PORT X -- I prefer ESP DOWNLOAD TOOL V2.4
When down load complete and PORT X released UNGROUND IO0
I open PORTX ESPlorer at desired Baud usually 9600-Nodemcu/Lua or 115200-Arduino
press reset ,, should see boot info

I am using esp8266_flasher to refresh the firmware which is ESP_8266_BIN0.92.bin and i used CoolTerm for testing. It seems to be ok when i am downloading the firmware by using the flasher. However, the computer cannot find any COM port after I disconnected the GIO0 and GND.

ESP8266 Community Forum

No Response after firmware is downloaded to esp

No Response after firmware is downloaded to esp

Re: No Response after firmware is downloaded to esp

Re: No Response after firmware is downloaded to esp

Re: No Response after firmware is downloaded to esp